From: Greg KH Subject: Re: [stable] [PATCH 2.6.36] RDMA/cxgb3: Turn off rx coalescing for iwarp connections. Date: Sat, 18 Sep 2010 20:58:30 -0700 Message-ID: <20100919035830.GB30706@kroah.com> References: <20100919003821.11904.91366.stgit@build.ogc.int> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20100919003821.11904.91366.stgit-T4OLL4TyM9aNDNWfRnPdfg@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Steve Wise Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, rdreier-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org, stable-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org List-Id: linux-rdma@vger.kernel.org On Sat, Sep 18, 2010 at 07:38:21PM -0500, Steve Wise wrote: > The HW by default has RX coalescing on. For iwarp connections, this was > causing a 100ms delay in connection establishement due to the ingress > MPA Start message being stalled in HW. So explicitly turn rx coalescing > off when setting up iwarp connections. > > This was causing very bad performance for NP64 gather operations using > OpenMPI due to the way it sets up connections on larger jobs. > > Signed-off-by: Steve Wise > --- Please read Documentation/stable_kernel_rules.txt for how to get a patch into the stable tree. Hint, you are close, but this isn't going to work this way... thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html