On Fri, Jul 08 2005, Ingo Molnar wrote:
>
> * Jens Axboe <[email protected]> wrote:
>
> > But! I used hdparm -t solely, 2.6 was always ~5% faster than 2.4. But
> > using -Tt slowed down the hd speed by about 30%. So it looks like some
> > scheduler interaction, perhaps the memory timing loops gets it marked
> > as batch or something?
>
> to check whether that could be the case, could you try:
>
> nice -n -20 hdparm -t /dev/hdc
>
> does that produce different results?
Same result, see my next mail, it turned out to be a read-ahead bug.
--
Jens Axboe
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