Re: [PATCH 1/1] cciss: set max scatter gather entries to 32 on P600

[James Bottomley]

On Wed, 2013-08-14 at 15:52 -0500, Mike Miller wrote:
> Patch 1/1
> 
> From: Mike Miller <mike.miller@xxxxxx>
> 
> 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@xxxxxx>
> Signed-off-by: Dwight (Bud) Brown <bubrown@xxxxxxxxxx>
> Signed-off-by: Tomas Henzl <thenzl@xxxxxxxxxx>
> Acked-by: Stephen M. Cameron <steve.cameron@xxxxxx>

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

James


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/