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SubjectRe: 2.6.0 performance problems
Thomas,

Have you tried lowering the read ahead in 2.6 to 8.

I don't know what you are doing with your workload but it is possible
that you are transferring useless data and clogging the plumbing a bit.

Cheers,
Dave



Thomas Molina wrote:

>It certainly looks like DMA is enabled. Under 2.4 I get:
>
>[root@lap root]# hdparm /dev/hda
>
>/dev/hda:
> multcount = 16 (on)
> IO_support = 1 (32-bit)
> unmaskirq = 1 (on)
> using_dma = 1 (on)
> keepsettings = 0 (off)
> readonly = 0 (off)
> readahead = 8 (on)
> geometry = 2584/240/63, sectors = 39070080, start = 0
>
>
>Under 2.6 I get:
>
>[root@lap root]# hdparm /dev/hda
>
>/dev/hda:
> multcount = 16 (on)
> IO_support = 1 (32-bit)
> unmaskirq = 1 (on)
> using_dma = 1 (on)
> keepsettings = 0 (off)
> readonly = 0 (off)
> readahead = 256 (on)
> geometry = 38760/16/63, sectors = 39070080, start = 0
>
>


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