Jens Axboe wrote:
On Tue, 2005-07-05 at 14:35 +0200, Ondrej Zary wrote:
2.4.26
root@pentium:/home/rainbow# time dd if=/dev/hda of=/dev/null bs=512
count=1048576
1048576+0 records in
1048576+0 records out
real 0m23.858s
user 0m1.750s
sys 0m15.180s
Perhaps some read-ahead bug. What happens if you use bs=128k for
instance?
Nothing - it's still the same.
root@pentium:/home/rainbow# time dd if=/dev/hda of=/dev/null bs=128k
count=4096
4096+0 records in
4096+0 records out
real 0m32.832s
user 0m0.040s
sys 0m15.670s
Can you post full dmesg of 2.4 and 2.6 kernel boot? What does hdparm
-I/-i say for both kernels?
The 2.4.26 kernel is the one from Slackware 10.0 bootable install CD.
dmesg outputs attached, hdparm -i and hdparm -I shows the same in both
kernels (compared using diff) - attached too.
Ok, looks alright for both. Your machine is quite slow, perhaps that is
showing the slower performance. Can you try and make HZ 100 in 2.6 and
test again? 2.6.13-recent has it as a config option, otherwise edit
include/asm/param.h appropriately.
I forgot to write that my 2.6.12 kernel is already compiled with HZ 100
(it makes the system more responsive).
I've just tried 2.6.8.1 with HZ 1000 and there is no difference in HDD
performance comparing to 2.6.12.
--
Ondrej Zary
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