On Fri, 11 Jul 2003 18:53:31 +0100, James Courtier-Dutton wrote:
> I have discovered that the performance of the bluez stack is a problem
> when using the hci_usb.c driver.
> I cannot get it to send SCO packets quicker than one urb per 40ms. As
> the headset needs one urb per 3ms, this is quite a problem. I would also
> assume that other applications like file transfer over bluetooth would
> be bad.
Have you identified what's actually causing this rate limit? It sounds
more like a scheduling issue to me than a number-of-memory-copies problem.
Would you consider sharing the code modifications you have made thus far?
I have been experimenting with two USB dongles with the aim of making the
PC act as a headset (I don't have one). I have been able to get reasonable
(although sometimes choppy audio) on the PC. That is, the sound is being
received by the PC. I haven't yet managed to test sending audio except for
/dev/zero. All this testing is with 2.4.20-mh10.
The two dongles I have are the Mitsumi WIF-0402c and the Sitecom CN-500,
which report as follows:
Sitecom CN-500:
$ sudo /sbin/hciconfig hci0 revision
hci0: Type: USB
BD Address: 00:10:60:A2:E4:C2 ACL MTU: 192:8 SCO MTU: 64:8
HCI 16.4
Chip version: BlueCore02
Max key size: 56 bit
SCO mapping: HCI
Mitsumi WIF-0402c:
$ sudo /sbin/hciconfig hci0 revision
hci0: Type: USB
BD Address: 00:A0:96:1D:4A:AA ACL MTU: 128:8 SCO MTU: 64:8
HCI 11.2
Chip version: BlueCore01b
SCO mapping: HCI
The Mitsumi accepts the SCO connection and then gives up, whereas the
Sitecom is able to sustain the connection for as long as I have tested
(<2minutes). The Mitsumi is much older, so I'm not surprised there are
problems. However, both devices work okay in this manner under Windows.
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Hello,
I am trying to measure the throughtput between two
laptops with bluetooth connection.
The l2test gives a very high value : in theranhe of
34567 kB/sec 76578 kB/sec.
I am not able to understand what the problem is .
Also the Time taken to tranfer the data is printed as
0.00 sec.
Using following commands:
Server : ./l2test -r
Client : ./l2test -s baddr.
Thanks,
Aarti.
--- Jonathan Paisley <[email protected]> wrote:
> On Fri, 11 Jul 2003 18:53:31 +0100, James
> Courtier-Dutton wrote:
>
> > I have discovered that the performance of the
> bluez stack is a problem
> > when using the hci_usb.c driver.
> > I cannot get it to send SCO packets quicker than
> one urb per 40ms. As
> > the headset needs one urb per 3ms, this is quite a
> problem. I would also
> > assume that other applications like file transfer
> over bluetooth would
> > be bad.
>
> Have you identified what's actually causing this
> rate limit? It sounds
> more like a scheduling issue to me than a
> number-of-memory-copies problem.
>
> Would you consider sharing the code modifications
> you have made thus far?
>
> I have been experimenting with two USB dongles with
> the aim of making the
> PC act as a headset (I don't have one). I have been
> able to get reasonable
> (although sometimes choppy audio) on the PC. That
> is, the sound is being
> received by the PC. I haven't yet managed to test
> sending audio except for
> /dev/zero. All this testing is with 2.4.20-mh10.
>
> The two dongles I have are the Mitsumi WIF-0402c and
> the Sitecom CN-500,
> which report as follows:
>
> Sitecom CN-500:
> $ sudo /sbin/hciconfig hci0 revision
> hci0: Type: USB
> BD Address: 00:10:60:A2:E4:C2 ACL MTU: 192:8
> SCO MTU: 64:8
> HCI 16.4
> Chip version: BlueCore02
> Max key size: 56 bit
> SCO mapping: HCI
>
> Mitsumi WIF-0402c:
> $ sudo /sbin/hciconfig hci0 revision
> hci0: Type: USB
> BD Address: 00:A0:96:1D:4A:AA ACL MTU: 128:8
> SCO MTU: 64:8
> HCI 11.2
> Chip version: BlueCore01b
> SCO mapping: HCI
>
> The Mitsumi accepts the SCO connection and then
> gives up, whereas the
> Sitecom is able to sustain the connection for as
> long as I have tested
> (<2minutes). The Mitsumi is much older, so I'm not
> surprised there are
> problems. However, both devices work okay in this
> manner under Windows.
>
>
>
>
>
>
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