Re: [git patches] IDE update

[Ondrej Zary]

André Tomt wrote:
> Al Boldi wrote:
>
> > Bartlomiej Zolnierkiewicz wrote: {
> >
> > > > > On 7/4/05, Al Boldi <a1426z@xxxxxxxxx> 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
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