There seems to be a problem between the Rfcomm tty driver code
and the generic n_tty line discipline where data can be lost.
This data loss is with respect to data coming from rfcomm and being
sent to the n_tty line discipline.
In the function, n_tty_receive_buf, there is the following code:
if (n_tty_receive_room(tty) < TTY_THRESHOLD_THROTTLE) {
/* check TTY_THROTTLED first so it indicates our state */
if (!test_and_set_bit(TTY_THROTTLED, &tty->flags) &&
tty->driver.throttle)
tty->driver.throttle(tty);
}
Basically, if the line discipline receive buffer gets close to
full (crosses the TTY_THRESHOLD_THROTTLE), it indicates to the
tty driver to throttle.
The rfcomm tty driver throttle function stops the flow of credits
to the remote device. However, the remote device may still have
many outstanding credits remaining. The remote device can continue
to send data as long as it has outstanding credit. Specifically, it can
send MTU * "outstanding credit" bytes. All of these bytes will
be passed to the line discipline regardless of the space remaining in its
receive buffer. If the MTU * "outstanding credit"
is greater than the space left in the line
discipline's receive buffer, the line discipline will discard that
data once the receive buffer is completely full.
You can induce data loss on BlueZ by writing a local application that opens
a rfcomm tty but does not read from it for a few seconds during which the
remote peer is sending data.
During the pause where the application does not read, the line discipline
buffer fills, it throttles the rfcomm tty driver, but the rfcomm tty
driver keeps on sending data to the line discipline until the remote peer uses up all
its outstanding credits.
We ran a similar experiment with the Affix stack but did not run into
this problem.
The rfcomm credit based flow control should prevent this kind of data loss.
Aaron
------------
Aaron Klish
Bluetooth Software Engineer
Motorola PCS
PH# (217) 384-8598
FX# (217) 384-8550
[X] Motorola General Business Information
[ ] Motorola Internal Use Only
[ ] Motorola Confidential Proprietary
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Hi Aaron,
> I didn't explain myself well. The subject of my mail was also incorrect.
> Suggesting exposing credit and RFCOMM frame size to user space has nothing to do
> with the Rfcomm TTY data loss I have observed. Therefore, I'm changing the subject of
> this thread to "setsockopt for RFCOMM".
I wasn't talking about the TTY data loss. This is another problem and I
will talk about it after I found the time to test it by myself.
> The MTU I was referring to in my email was not the L2CAP MTU that Rfcomm initializes for PSM 3.
>
> I was referring to the "Maximum Frame Size" defined in GSM 7.10 specification in
> section 5.1.8.1.1.
>
> This is the part of the PN negotiation in core.c:
>
> pn->mtu = htobs(d->mtu);
>
> in function rfcomm_send_pn.
>
> This Maximum Frame Size is separate than the L2CAP MTU negotiated. The Maximum Frame
> Size cannot exceed the L2CAP MTU negotiated, but it can certainly be less.
And this is why it doesn't matter, because we have the underlaying L2CAP
MTU as max value.
s->mtu = min(l2cap_pi(sk)->omtu, l2cap_pi(sk)->imtu) - 5;
d->mtu = s->mtu;
> The reason we are interested in changing these values (credit and Max Frame Size)
> is not for performance but to limit memory.
>
> When RFCOMM sends a PN, it is advertising an abstract "buffer size" which equals
> the number of credits * the Maximum Frame Size.
>
> Currently, this abstract "buffer" is defined at compile time. To customize it
> for a given product, requires modifying the kernel or modules. Furthermore,
> this "buffer" is currently the same size for all services.
It makes no sense to shrink the RFCOMM frame size, because this ends up
in performance problems and we already have the L2CAP packet which can
be size of L2CAP MTU. We don't copy the L2CAP packet and so RFCOMM needs
no extra buffer for it. The only variable parameter to limit the memory
usage is the number of outstanding credits, but this can also decrease
the performance.
> It would be nice to be able to configure this without having to recompile
> and to customize it on a per service basis.
The RFCOMM frame size can be negotiated per channel, but it makes no
sense to do this, because we have the same underlaying L2CAP connection
for each channel. We have the same L2CAP MTU for all RFCOMM channels on
that ACL link and so we can use the same frame size for all RFCOMM
channels.
Regards
Marcel
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Hi Marcel,
I didn't explain myself well. The subject of my mail was also incorrect.
Suggesting exposing credit and RFCOMM frame size to user space has nothing to do
with the Rfcomm TTY data loss I have observed. Therefore, I'm changing the subject of
this thread to "setsockopt for RFCOMM".
The MTU I was referring to in my email was not the L2CAP MTU that Rfcomm initializes for PSM 3.
I was referring to the "Maximum Frame Size" defined in GSM 7.10 specification in
section 5.1.8.1.1.
This is the part of the PN negotiation in core.c:
pn->mtu = htobs(d->mtu);
in function rfcomm_send_pn.
This Maximum Frame Size is separate than the L2CAP MTU negotiated. The Maximum Frame
Size cannot exceed the L2CAP MTU negotiated, but it can certainly be less.
The reason we are interested in changing these values (credit and Max Frame Size)
is not for performance but to limit memory.
When RFCOMM sends a PN, it is advertising an abstract "buffer size" which equals
the number of credits * the Maximum Frame Size.
Currently, this abstract "buffer" is defined at compile time. To customize it
for a given product, requires modifying the kernel or modules. Furthermore,
this "buffer" is currently the same size for all services.
It would be nice to be able to configure this without having to recompile
and to customize it on a per service basis.
Aaron
------------
Aaron Klish
Bluetooth Software Engineer
Motorola PCS
PH# (217) 384-8598
FX# (217) 384-8550
[X] Motorola General Business Information
[ ] Motorola Internal Use Only
[ ] Motorola Confidential Proprietary
On 23 Oct 2003, Marcel Holtmann wrote:
> Hi Aaron,
>
> > Are there any plans in the future to allow control of RFCOMM MTU and credits from user space?
> > I'm using 2.4.20 (mh9 patch) and these parameters are currently assigned default values in the kernel.
> > L2CAP already has an option to control MTU through setsockopt. It seems like adding control
> > for parameters for RFCOMM would be a good feature - perhaps also through setsockopt? Any thoughts
> > on this? Thanks.
>
> the Linux implementation of RFCOMM is a stream and so it don't have a
> MTU. You have the in and out MTU of the underlaying L2CAP PSM 3 and we
> try to set them to 1024 by default. We have talked about this some time
> ago (look at the archive) and there is no proof that having a different
> L2CAP MTU improves the performance of RFCOMM.
>
> The credits are not for the user space, because they are only used for
> the flow control. These kind of stuff must be handled by the RFCOMM
> layer and nobody should have to worry about it. If there is a problem
> with it, we have to fix it in the RFCOMM layer itself.
>
> Regards
>
> Marcel
>
>
Hi Aaron,
> Are there any plans in the future to allow control of RFCOMM MTU and credits from user space?
> I'm using 2.4.20 (mh9 patch) and these parameters are currently assigned default values in the kernel.
> L2CAP already has an option to control MTU through setsockopt. It seems like adding control
> for parameters for RFCOMM would be a good feature - perhaps also through setsockopt? Any thoughts
> on this? Thanks.
the Linux implementation of RFCOMM is a stream and so it don't have a
MTU. You have the in and out MTU of the underlaying L2CAP PSM 3 and we
try to set them to 1024 by default. We have talked about this some time
ago (look at the archive) and there is no proof that having a different
L2CAP MTU improves the performance of RFCOMM.
The credits are not for the user space, because they are only used for
the flow control. These kind of stuff must be handled by the RFCOMM
layer and nobody should have to worry about it. If there is a problem
with it, we have to fix it in the RFCOMM layer itself.
Regards
Marcel
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Hi Marcel,
Are there any plans in the future to allow control of RFCOMM MTU and credits from user space?
I'm using 2.4.20 (mh9 patch) and these parameters are currently assigned default values in the kernel.
L2CAP already has an option to control MTU through setsockopt. It seems like adding control
for parameters for RFCOMM would be a good feature - perhaps also through setsockopt? Any thoughts
on this? Thanks.
Aaron
------------
Aaron Klish
Bluetooth Software Engineer
Motorola PCS
PH# (217) 384-8598
FX# (217) 384-8550
[X] Motorola General Business Information
[ ] Motorola Internal Use Only
[ ] Motorola Confidential Proprietary
Hi Marcel,
I'm testing with Kernel 2.4.20. I've tested this on machines patched with
patch-2.4.20-mh12
as well as
patch-2.4.20-mh9
Source for a sample program to reproduce the failure is attached. Below are the steps I took
to reproduce the problem with this sample:
Machine A Machine B
---------- ----------
rfcomm listen 0 1
rfcomm connect 0 XX:XX:XX:XX:XX:XX 1
stress /dev/rfcomm0 0
stress /dev/rfcomm0 1
Machine B starts writing
wait until Machine B stops writing...
Press a key
Machine A starts reading....
If you redirect the output of stress from Machine A, you should see something like:
Note after 409 reads (actually exactly 4096 bytes), there is data loss:
Start 1066754940.343150
Reader
Press Enter when the Writer stops sending...
Time: 30.004504 Read: ^^^ 0
Time: 30.004533 Read: ^^^ 1
Time: 30.004542 Read: ^^^ 2
Time: 30.004551 Read: ^^^ 3
Time: 30.004560 Read: ^^^ 4
Time: 30.004568 Read: ^^^ 5
Time: 30.004577 Read: ^^^ 6
Time: 30.004586 Read: ^^^ 7
Time: 30.004595 Read: ^^^ 8
Time: 30.004603 Read: ^^^ 9
Time: 30.004612 Read: ^^^ 10
Time: 30.004621 Read: ^^^ 11
Time: 30.004630 Read: ^^^ 12
Time: 30.004639 Read: ^^^ 13
Time: 30.004647 Read: ^^^ 14
Time: 30.004656 Read: ^^^ 15
Time: 30.004665 Read: ^^^ 16
Time: 30.004674 Read: ^^^ 17
Time: 30.004683 Read: ^^^ 18
Time: 30.004691 Read: ^^^ 19
Time: 30.004700 Read: ^^^ 20
Time: 30.004709 Read: ^^^ 21
Time: 30.004718 Read: ^^^ 22
Time: 30.004727 Read: ^^^ 23
Time: 30.004735 Read: ^^^ 24
Time: 30.004744 Read: ^^^ 25
Time: 30.004753 Read: ^^^ 26
Time: 30.004762 Read: ^^^ 27
Time: 30.004770 Read: ^^^ 28
Time: 30.004779 Read: ^^^ 29
Time: 30.004788 Read: ^^^ 30
Time: 30.004797 Read: ^^^ 31
Time: 30.004806 Read: ^^^ 32
Time: 30.004814 Read: ^^^ 33
Time: 30.004823 Read: ^^^ 34
Time: 30.004832 Read: ^^^ 35
Time: 30.004841 Read: ^^^ 36
Time: 30.004849 Read: ^^^ 37
Time: 30.004858 Read: ^^^ 38
Time: 30.004867 Read: ^^^ 39
Time: 30.004876 Read: ^^^ 40
Time: 30.004885 Read: ^^^ 41
Time: 30.004893 Read: ^^^ 42
Time: 30.004902 Read: ^^^ 43
Time: 30.004911 Read: ^^^ 44
Time: 30.004920 Read: ^^^ 45
Time: 30.004929 Read: ^^^ 46
Time: 30.004937 Read: ^^^ 47
Time: 30.004946 Read: ^^^ 48
Time: 30.004955 Read: ^^^ 49
Time: 30.004964 Read: ^^^ 50
Time: 30.004972 Read: ^^^ 51
Time: 30.004981 Read: ^^^ 52
Time: 30.004990 Read: ^^^ 53
Time: 30.004999 Read: ^^^ 54
Time: 30.005008 Read: ^^^ 55
Time: 30.005016 Read: ^^^ 56
Time: 30.005025 Read: ^^^ 57
Time: 30.005034 Read: ^^^ 58
Time: 30.005043 Read: ^^^ 59
Time: 30.005051 Read: ^^^ 60
Time: 30.005060 Read: ^^^ 61
Time: 30.005069 Read: ^^^ 62
Time: 30.005077 Read: ^^^ 63
Time: 30.005086 Read: ^^^ 64
Time: 30.005095 Read: ^^^ 65
Time: 30.005104 Read: ^^^ 66
Time: 30.005112 Read: ^^^ 67
Time: 30.005121 Read: ^^^ 68
Time: 30.005130 Read: ^^^ 69
Time: 30.005139 Read: ^^^ 70
Time: 30.005147 Read: ^^^ 71
Time: 30.005156 Read: ^^^ 72
Time: 30.005165 Read: ^^^ 73
Time: 30.005173 Read: ^^^ 74
Time: 30.005182 Read: ^^^ 75
Time: 30.005191 Read: ^^^ 76
Time: 30.005200 Read: ^^^ 77
Time: 30.005208 Read: ^^^ 78
Time: 30.005217 Read: ^^^ 79
Time: 30.005226 Read: ^^^ 80
Time: 30.005235 Read: ^^^ 81
Time: 30.005243 Read: ^^^ 82
Time: 30.005252 Read: ^^^ 83
Time: 30.005261 Read: ^^^ 84
Time: 30.005270 Read: ^^^ 85
Time: 30.005278 Read: ^^^ 86
Time: 30.005287 Read: ^^^ 87
Time: 30.005296 Read: ^^^ 88
Time: 30.005305 Read: ^^^ 89
Time: 30.005313 Read: ^^^ 90
Time: 30.005322 Read: ^^^ 91
Time: 30.005331 Read: ^^^ 92
Time: 30.005340 Read: ^^^ 93
Time: 30.005349 Read: ^^^ 94
Time: 30.005357 Read: ^^^ 95
Time: 30.005366 Read: ^^^ 96
Time: 30.005375 Read: ^^^ 97
Time: 30.005383 Read: ^^^ 98
Time: 30.005392 Read: ^^^ 99
Time: 30.005401 Read: ^^^ 100
Time: 30.005410 Read: ^^^ 101
Time: 30.005419 Read: ^^^ 102
Time: 30.005427 Read: ^^^ 103
Time: 30.005436 Read: ^^^ 104
Time: 30.005445 Read: ^^^ 105
Time: 30.005454 Read: ^^^ 106
Time: 30.005462 Read: ^^^ 107
Time: 30.005471 Read: ^^^ 108
Time: 30.005480 Read: ^^^ 109
Time: 30.005489 Read: ^^^ 110
Time: 30.005497 Read: ^^^ 111
Time: 30.005506 Read: ^^^ 112
Time: 30.005515 Read: ^^^ 113
Time: 30.005524 Read: ^^^ 114
Time: 30.005532 Read: ^^^ 115
Time: 30.005541 Read: ^^^ 116
Time: 30.005550 Read: ^^^ 117
Time: 30.005559 Read: ^^^ 118
Time: 30.005567 Read: ^^^ 119
Time: 30.005576 Read: ^^^ 120
Time: 30.005585 Read: ^^^ 121
Time: 30.005594 Read: ^^^ 122
Time: 30.005602 Read: ^^^ 123
Time: 30.005611 Read: ^^^ 124
Time: 30.005620 Read: ^^^ 125
Time: 30.005635 Read: ^^^ 126
Time: 30.005644 Read: ^^^ 127
Time: 30.005653 Read: ^^^ 128
Time: 30.005662 Read: ^^^ 129
Time: 30.005670 Read: ^^^ 130
Time: 30.005679 Read: ^^^ 131
Time: 30.005688 Read: ^^^ 132
Time: 30.005697 Read: ^^^ 133
Time: 30.005705 Read: ^^^ 134
Time: 30.005714 Read: ^^^ 135
Time: 30.005723 Read: ^^^ 136
Time: 30.005732 Read: ^^^ 137
Time: 30.005740 Read: ^^^ 138
Time: 30.005749 Read: ^^^ 139
Time: 30.005758 Read: ^^^ 140
Time: 30.005767 Read: ^^^ 141
Time: 30.005775 Read: ^^^ 142
Time: 30.005784 Read: ^^^ 143
Time: 30.005793 Read: ^^^ 144
Time: 30.005801 Read: ^^^ 145
Time: 30.005810 Read: ^^^ 146
Time: 30.005819 Read: ^^^ 147
Time: 30.005827 Read: ^^^ 148
Time: 30.005836 Read: ^^^ 149
Time: 30.005845 Read: ^^^ 150
Time: 30.005854 Read: ^^^ 151
Time: 30.005862 Read: ^^^ 152
Time: 30.005871 Read: ^^^ 153
Time: 30.005880 Read: ^^^ 154
Time: 30.005889 Read: ^^^ 155
Time: 30.005897 Read: ^^^ 156
Time: 30.005906 Read: ^^^ 157
Time: 30.005915 Read: ^^^ 158
Time: 30.005924 Read: ^^^ 159
Time: 30.005932 Read: ^^^ 160
Time: 30.005941 Read: ^^^ 161
Time: 30.005950 Read: ^^^ 162
Time: 30.005959 Read: ^^^ 163
Time: 30.005967 Read: ^^^ 164
Time: 30.005976 Read: ^^^ 165
Time: 30.005985 Read: ^^^ 166
Time: 30.005993 Read: ^^^ 167
Time: 30.006002 Read: ^^^ 168
Time: 30.006011 Read: ^^^ 169
Time: 30.006020 Read: ^^^ 170
Time: 30.006028 Read: ^^^ 171
Time: 30.006037 Read: ^^^ 172
Time: 30.006046 Read: ^^^ 173
Time: 30.006055 Read: ^^^ 174
Time: 30.006063 Read: ^^^ 175
Time: 30.006072 Read: ^^^ 176
Time: 30.006081 Read: ^^^ 177
Time: 30.006089 Read: ^^^ 178
Time: 30.006098 Read: ^^^ 179
Time: 30.006107 Read: ^^^ 180
Time: 30.006116 Read: ^^^ 181
Time: 30.006124 Read: ^^^ 182
Time: 30.006133 Read: ^^^ 183
Time: 30.006142 Read: ^^^ 184
Time: 30.006150 Read: ^^^ 185
Time: 30.006159 Read: ^^^ 186
Time: 30.006168 Read: ^^^ 187
Time: 30.006176 Read: ^^^ 188
Time: 30.006185 Read: ^^^ 189
Time: 30.006194 Read: ^^^ 190
Time: 30.006203 Read: ^^^ 191
Time: 30.006211 Read: ^^^ 192
Time: 30.006220 Read: ^^^ 193
Time: 30.006229 Read: ^^^ 194
Time: 30.006238 Read: ^^^ 195
Time: 30.006246 Read: ^^^ 196
Time: 30.006255 Read: ^^^ 197
Time: 30.006264 Read: ^^^ 198
Time: 30.006272 Read: ^^^ 199
Time: 30.006281 Read: ^^^ 200
Time: 30.006290 Read: ^^^ 201
Time: 30.006299 Read: ^^^ 202
Time: 30.006307 Read: ^^^ 203
Time: 30.006316 Read: ^^^ 204
Time: 30.006325 Read: ^^^ 205
Time: 30.006334 Read: ^^^ 206
Time: 30.006342 Read: ^^^ 207
Time: 30.006351 Read: ^^^ 208
Time: 30.006360 Read: ^^^ 209
Time: 30.006369 Read: ^^^ 210
Time: 30.006377 Read: ^^^ 211
Time: 30.006386 Read: ^^^ 212
Time: 30.006395 Read: ^^^ 213
Time: 30.006404 Read: ^^^ 214
Time: 30.006412 Read: ^^^ 215
Time: 30.006421 Read: ^^^ 216
Time: 30.006430 Read: ^^^ 217
Time: 30.006438 Read: ^^^ 218
Time: 30.006447 Read: ^^^ 219
Time: 30.006456 Read: ^^^ 220
Time: 30.006465 Read: ^^^ 221
Time: 30.006473 Read: ^^^ 222
Time: 30.006482 Read: ^^^ 223
Time: 30.006491 Read: ^^^ 224
Time: 30.006499 Read: ^^^ 225
Time: 30.006508 Read: ^^^ 226
Time: 30.006517 Read: ^^^ 227
Time: 30.006526 Read: ^^^ 228
Time: 30.006534 Read: ^^^ 229
Time: 30.006543 Read: ^^^ 230
Time: 30.006552 Read: ^^^ 231
Time: 30.006560 Read: ^^^ 232
Time: 30.006569 Read: ^^^ 233
Time: 30.006578 Read: ^^^ 234
Time: 30.006587 Read: ^^^ 235
Time: 30.006595 Read: ^^^ 236
Time: 30.006604 Read: ^^^ 237
Time: 30.006613 Read: ^^^ 238
Time: 30.006621 Read: ^^^ 239
Time: 30.006630 Read: ^^^ 240
Time: 30.006639 Read: ^^^ 241
Time: 30.006648 Read: ^^^ 242
Time: 30.006657 Read: ^^^ 243
Time: 30.006665 Read: ^^^ 244
Time: 30.006674 Read: ^^^ 245
Time: 30.006683 Read: ^^^ 246
Time: 30.006691 Read: ^^^ 247
Time: 30.006700 Read: ^^^ 248
Time: 30.006709 Read: ^^^ 249
Time: 30.006718 Read: ^^^ 250
Time: 30.006726 Read: ^^^ 251
Time: 30.006735 Read: ^^^ 252
Time: 30.006744 Read: ^^^ 253
Time: 30.006758 Read: ^^^ 254
Time: 30.006767 Read: ^^^ 255
Time: 30.006775 Read: ^^^ 256
Time: 30.006784 Read: ^^^ 257
Time: 30.006793 Read: ^^^ 258
Time: 30.006802 Read: ^^^ 259
Time: 30.006810 Read: ^^^ 260
Time: 30.006819 Read: ^^^ 261
Time: 30.006828 Read: ^^^ 262
Time: 30.006837 Read: ^^^ 263
Time: 30.006845 Read: ^^^ 264
Time: 30.006854 Read: ^^^ 265
Time: 30.006863 Read: ^^^ 266
Time: 30.006872 Read: ^^^ 267
Time: 30.006881 Read: ^^^ 268
Time: 30.006889 Read: ^^^ 269
Time: 30.006898 Read: ^^^ 270
Time: 30.006907 Read: ^^^ 271
Time: 30.006916 Read: ^^^ 272
Time: 30.006924 Read: ^^^ 273
Time: 30.006933 Read: ^^^ 274
Time: 30.006942 Read: ^^^ 275
Time: 30.006951 Read: ^^^ 276
Time: 30.006959 Read: ^^^ 277
Time: 30.006968 Read: ^^^ 278
Time: 30.006977 Read: ^^^ 279
Time: 30.006986 Read: ^^^ 280
Time: 30.006995 Read: ^^^ 281
Time: 30.007003 Read: ^^^ 282
Time: 30.007012 Read: ^^^ 283
Time: 30.007021 Read: ^^^ 284
Time: 30.007030 Read: ^^^ 285
Time: 30.007038 Read: ^^^ 286
Time: 30.007047 Read: ^^^ 287
Time: 30.007056 Read: ^^^ 288
Time: 30.007065 Read: ^^^ 289
Time: 30.007073 Read: ^^^ 290
Time: 30.007082 Read: ^^^ 291
Time: 30.007091 Read: ^^^ 292
Time: 30.007100 Read: ^^^ 293
Time: 30.007109 Read: ^^^ 294
Time: 30.007117 Read: ^^^ 295
Time: 30.007126 Read: ^^^ 296
Time: 30.007135 Read: ^^^ 297
Time: 30.007143 Read: ^^^ 298
Time: 30.007152 Read: ^^^ 299
Time: 30.007161 Read: ^^^ 300
Time: 30.007170 Read: ^^^ 301
Time: 30.007178 Read: ^^^ 302
Time: 30.007187 Read: ^^^ 303
Time: 30.007196 Read: ^^^ 304
Time: 30.007205 Read: ^^^ 305
Time: 30.007214 Read: ^^^ 306
Time: 30.007222 Read: ^^^ 307
Time: 30.007231 Read: ^^^ 308
Time: 30.007240 Read: ^^^ 309
Time: 30.007249 Read: ^^^ 310
Time: 30.007258 Read: ^^^ 311
Time: 30.007266 Read: ^^^ 312
Time: 30.007275 Read: ^^^ 313
Time: 30.007284 Read: ^^^ 314
Time: 30.007293 Read: ^^^ 315
Time: 30.007301 Read: ^^^ 316
Time: 30.007310 Read: ^^^ 317
Time: 30.007319 Read: ^^^ 318
Time: 30.007328 Read: ^^^ 319
Time: 30.007337 Read: ^^^ 320
Time: 30.007345 Read: ^^^ 321
Time: 30.007354 Read: ^^^ 322
Time: 30.007363 Read: ^^^ 323
Time: 30.007372 Read: ^^^ 324
Time: 30.007380 Read: ^^^ 325
Time: 30.007389 Read: ^^^ 326
Time: 30.007398 Read: ^^^ 327
Time: 30.007407 Read: ^^^ 328
Time: 30.007416 Read: ^^^ 329
Time: 30.007424 Read: ^^^ 330
Time: 30.007433 Read: ^^^ 331
Time: 30.007442 Read: ^^^ 332
Time: 30.007451 Read: ^^^ 333
Time: 30.007459 Read: ^^^ 334
Time: 30.007468 Read: ^^^ 335
Time: 30.007477 Read: ^^^ 336
Time: 30.007486 Read: ^^^ 337
Time: 30.007494 Read: ^^^ 338
Time: 30.007503 Read: ^^^ 339
Time: 30.007512 Read: ^^^ 340
Time: 30.007521 Read: ^^^ 341
Time: 30.007530 Read: ^^^ 342
Time: 30.007538 Read: ^^^ 343
Time: 30.007547 Read: ^^^ 344
Time: 30.007556 Read: ^^^ 345
Time: 30.007565 Read: ^^^ 346
Time: 30.007574 Read: ^^^ 347
Time: 30.007582 Read: ^^^ 348
Time: 30.007591 Read: ^^^ 349
Time: 30.007600 Read: ^^^ 350
Time: 30.007609 Read: ^^^ 351
Time: 30.007618 Read: ^^^ 352
Time: 30.007626 Read: ^^^ 353
Time: 30.007635 Read: ^^^ 354
Time: 30.007644 Read: ^^^ 355
Time: 30.007653 Read: ^^^ 356
Time: 30.007661 Read: ^^^ 357
Time: 30.007670 Read: ^^^ 358
Time: 30.007679 Read: ^^^ 359
Time: 30.007688 Read: ^^^ 360
Time: 30.007696 Read: ^^^ 361
Time: 30.007705 Read: ^^^ 362
Time: 30.007714 Read: ^^^ 363
Time: 30.007723 Read: ^^^ 364
Time: 30.007731 Read: ^^^ 365
Time: 30.007740 Read: ^^^ 366
Time: 30.007749 Read: ^^^ 367
Time: 30.007758 Read: ^^^ 368
Time: 30.007766 Read: ^^^ 369
Time: 30.007775 Read: ^^^ 370
Time: 30.007784 Read: ^^^ 371
Time: 30.007793 Read: ^^^ 372
Time: 30.007801 Read: ^^^ 373
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------------
Aaron Klish
Bluetooth Software Engineer
Motorola PCS
PH# (217) 384-8598
FX# (217) 384-8550
[X] Motorola General Business Information
[ ] Motorola Internal Use Only
[ ] Motorola Confidential Proprietary
On 21 Oct 2003, Marcel Holtmann wrote:
> Hi Aaron,
>
> > There seems to be a problem between the Rfcomm tty driver code
> > and the generic n_tty line discipline where data can be lost.
>
> please tell us which kernel version you have tested. Have you used any
> additional patches that we should know of? We included a TTY buffer
> management patch from David Woodhouse some time ago.
>
> Do you have a test program with that we can reproduce this behaviour?
>
> Regards
>
> Marcel
>
>
Hi Aaron,
> There seems to be a problem between the Rfcomm tty driver code
> and the generic n_tty line discipline where data can be lost.
please tell us which kernel version you have tested. Have you used any
additional patches that we should know of? We included a TTY buffer
management patch from David Woodhouse some time ago.
Do you have a test program with that we can reproduce this behaviour?
Regards
Marcel
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