Re: Random file I/O regressions in 2.6 [patch+results]

Ram Pai
2004-05-20T01:31:40Z

On Wed, 2004-05-19 at 18:06, Alexey Kopytov wrote:
> Ram Pai wrote:
>
> >Attached the cleaned up patch and the performance results of the patch.
> >
> >Overall Observation:
> > 1.Small improvement with iozone with the patch, and overall
> > much better performance than 2.4
> > 2.Small/neglegible improvement with DSS workload.
> > 3.Negligible impact with sysbench, but results worser than
> > 2.4 kernels
>
> Ram, can you clarify the status of this patch please?
>
> I ran the same sysbench test on my hardware with patched 2.6.6 and got
> 122.2348s execution time, i.e. almost the same results as in the original
> tests. Is this patch an intermediate step to improve the sysbench workload on
> 2.6, or it just addresses another problem?

this patch by itself does not address your problem. Your problem is
better addressed by Andrew's 'readahead-private' patch.

However; this patch applied on top of Andrew's 'readahead-private' patch
may get you some extra performance.

Can you confirm this please?
RP