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SubjectRe: [PATCH 1/1] cciss: set max scatter gather entries to 32 on P600
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On Wed, 2013-08-14 at 15:52 -0500, Mike Miller wrote:
> Patch 1/1
>
> From: Mike Miller <mike.miller@hp.com>
>
> At one time we used to set the maximum number of scatter gather elements on
> all Smart Array controllers to 32. At some point in time the firmware began
> to write the "appropriate" value for each controller into the config table.
> The cciss driver would then read that and set h->maxsgentries.
>
> h->maxsgentries = readl(&(h->cfgtable->MaxSGElements);
>
> On the P600 that value is 544. Under some workloads a significant
> performance reduction may result. This patch forces the P600 to use only 32
> scatter gather elements. Other controllers are not affected.
>
> Signed-off-by: Mike Miller <mike.miller@hp.com>
> Signed-off-by: Dwight (Bud) Brown <bubrown@redhat.com>
> Signed-off-by: Tomas Henzl <thenzl@redhat.com>
> Acked-by: Stephen M. Cameron <steve.cameron@hp.com>

I don't quite understand the signoff chain on this patch. For a one
line patch, are you saying it has three authors?

James




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