Messages in this thread | | | Subject | Re: [PATCH 1/1] cciss: set max scatter gather entries to 32 on P600 | From | James Bottomley <> | Date | Wed, 14 Aug 2013 14:27:07 -0700 |
| |
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
| |