Hello,
My ide performance seems to have dropped noticably from 2.4.x to
2.6.0-pre1...
the controller is an hpt-366, there's only one drive connected to it.
It's on an 80 pin cable, and the cable is plugged in the right way.
hdparm reports that the drive is using udma4 (it's udma5 capable, the
controller is not)
from 2.4.x, hdparm -t
Timing buffered disk reads: 140 MB in 3.02 seconds = 46.36 MB/sec
and vmstat 1 while it's running shows
0 0 0 349064 1964 9784 0 0 0 0 101 4 0 0 100 0
1 0 0 335360 1964 23480 0 0 11648 0 282 356 0 9 90 0
1 0 0 286976 1964 71864 0 0 48384 0 863 1469 1 38 61 0
1 0 0 239360 1964 119480 0 0 47616 0 844 1451 1 33 65 0
0 0 0 349108 1964 9784 0 0 35840 0 664 1095 0 31 69 0
also,
time dd if=/dev/hde1 of=/dev/null bs=4096
768088+0 records in
768088+0 records out
real 1m6.079s
user 0m0.850s
sys 0m16.720s
under 2.6.0-pre1, I get
Timing buffered disk reads: 88 MB in 3.02 seconds = 29.14 MB/sec
vmstat says
0 0 0 334748 2172 10816 0 0 0 0 1002 4 0 0 100 0
1 1 0 329180 5636 12860 0 0 3464 0 1031 64 0 2 93 4
1 0 0 298140 35692 12860 0 0 30080 0 1244 483 1 20 50 30
1 0 0 266972 65924 12888 0 0 30208 0 1239 480 0 19 50 30
1 0 0 334108 2172 10884 0 0 26496 0 1253 426 0 26 48 26
0 0 0 334180 2172 10884 0 0 0 0 1010 18 0 0 100 0
(this is a dual processor machine, so this looks to me like I'm cpu bound
where I wasn't before?)
time dd if=/dev/hde1 of=/dev/null bs=4096
dd: reading `/dev/hde1': Input/output error
768088+0 records in
768088+0 records out
real 1m33.977s
user 0m0.967s
sys 0m26.695s
the input/output error is new too...
I also tried with everything in the Kernel Hacking sub-menu disabled, and
got results from hdparm as high as 31.53MB/sec
Any idea what's wrong?
On Tue, 2003-07-15 at 23:49, [email protected] wrote:
> Hello,
>
> My ide performance seems to have dropped noticably from 2.4.x to
> 2.6.0-pre1...
What does "hdparm /dev/hde" tell us?
On Tue, 16 Jul 2003, Felipe Alfaro Solana wrote:
> On Tue, 2003-07-15 at 23:49, [email protected] wrote:
> > Hello,
> >
> > My ide performance seems to have dropped noticably from 2.4.x to
> > 2.6.0-pre1...
>
> What does "hdparm /dev/hde" tell us?
hdparm /dev/hde from 2.6.0-pre1
/dev/hde:
multcount = 16 (on)
IO_support = 1 (32-bit)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 256 (on)
geometry = 50765/16/63, sectors = 117231408, start = 0
---
hdparm /dev/hde from 2.4
/dev/hde:
multcount = 16 (on)
IO_support = 1 (32-bit)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 116301/16/63, sectors = 117231408, start = 0
I hadn't noticed the change in readahead previously, so I tried setting it
to 8 in 2.6.0-pre1 with hdparm -a 8 /dev/hde
hdparm -t /dev/hde
/dev/hde:
Timing buffered disk reads: 32 MB in 3.01 seconds = 10.64 MB/sec
hdparm -a 512 on the other hand...
Timing buffered disk reads: 140 MB in 3.03 seconds = 46.18 MB/sec
and I get my previous numbers back.
I guess the meaning of the parameter has changed dramatically? (what was
once sectors is now bytes?)
2003-07-15 22:27:19 derek wrote:
> hdparm -a 512 on the other hand...
> Timing buffered disk reads: 140 MB in 3.03 seconds = 46.18 MB/sec
> and I get my previous numbers back.
Ahhh thank you derek! I followed your example and got _my_ old numbers
back, from 22 to 28 MB/sec. Surely this is a bUg. Been there for a long
time.
Mvh
Mats Johannesson