Re: Production comparison between 2.4.27 and 2.6.8.1

[Nick Piggin]

Massimo Cetra wrote:
> Nick Piggin wrote:
>
>
> > > Is this issue being analyzed ?
> > > Should we hope in an improvement sometime?
> > > Or I'll have to use 2.4 to have good performance ?
> >
> > You booted with elevator=deadline and things still didn't 
> > improve though, correct? If so, then the problem should be 
> > found and fixed.
>
>
> Yes, that's correct.
> Thanks.  I'll try next versions of kernel.
> I dont think 2.8.9-RC1 includes something regarding this issue.

OK, can you try testing different values of
/sys/block/???/queue/read_ahead_kb

and

/sys/block/???/queue/nr_requests

You should set '???' for all disks involved.


First, try setting read_ahead_kb to 0, then 256.
If those values don't change anything, set nr_requests to 1024.

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