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SubjectRe: 2.5.32 IO performance issues
Badari Pulavarty wrote:
>
> Hi,
>
> I am having severe IO performance problems with 2.5.32 (2.5.31 works fine).
> I was wondering what caused this.
>
> As you can see, IO rate went from
>
> 384MB/sec with 6% CPU utilization on 2.5.31
> to
> 120MB/sec with 19% CPU utilization on 2.5.32
>
> ...
> 151712 default_idle 2370.5000
> 21622 __scsi_end_request 122.8523

block-highmem is bust for scsi. (aic7xxx at least). Does
http://www.zip.com.au/~akpm/linux/patches/2.5/2.5.32/2.5.32-mm2/broken-out/scsi_hack.patch
fix it?
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