Re: [git patches] IDE update

[Ondrej Zary <linux@rainbow-software.org>]

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