Re: [git patches] IDE update

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

André Tomt wrote:
> Al Boldi wrote:
> 
>> Bartlomiej Zolnierkiewicz wrote: {
>>
>>>>> On 7/4/05, Al Boldi <a1426z@gawab.com> wrote:
>>>>> Hdparm -tT gives 38mb/s in 2.4.31
>>>>> Cat /dev/hda > /dev/null gives 2% user 33% sys 65% idle
>>>>>
>>>>> Hdparm -tT gives 28mb/s in 2.6.12
>>>>> Cat /dev/hda > /dev/null gives 2% user 25% sys 0% idle 73% IOWAIT
> 
> 
> The "hdparm doesn't get as high scores as in 2.4" is a old discussed to 
> death "problem" on LKML. So far nobody has been able to show it affects 
> anything  but that pretty useless quasi-benchmark.
> 

No, it's not a problem with hdparm. hdparm only shows that there is 
_really_ a problem:

2.6.12
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    0m32.339s
user    0m1.500s
sys     0m14.560s

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

-- 
Ondrej Zary