From mboxrd@z Thu Jan 1 00:00:00 1970 From: Neil Horman Subject: Re: [PATCH] x86: Run checksumming in parallel accross multiple alu's Date: Fri, 1 Nov 2013 12:08:02 -0400 Message-ID: <20131101160802.GB8467@hmsreliant.think-freely.org> References: <201310300525.r9U5Pdqo014902@ib.usersys.redhat.com> <20131030110214.GA10220@localhost.localdomain> <52710B09.6090302@redhat.com> <20131031183003.GC25894@hmsreliant.think-freely.org> <1383320566.1737.0.camel@bwh-desktop.uk.level5networks.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Doug Ledford , Ingo Molnar , Eric Dumazet , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, David Laight To: Ben Hutchings Return-path: Content-Disposition: inline In-Reply-To: <1383320566.1737.0.camel@bwh-desktop.uk.level5networks.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org On Fri, Nov 01, 2013 at 03:42:46PM +0000, Ben Hutchings wrote: > On Thu, 2013-10-31 at 14:30 -0400, Neil Horman wrote: > [...] > > It > > functions, but unfortunately the performance lost to the completely broken > > branch prediction that this inflicts makes it a non starter: > [...] > > Conditional branches are no good but conditional moves might be worth a shot. > > Ben. > How would you suggest replacing the jumps in this case? I agree it would be faster here, but I'm not sure how I would implement an increment using a single conditional move. Neil > -- > Ben Hutchings, Staff Engineer, Solarflare > Not speaking for my employer; that's the marketing department's job. > They asked us to note that Solarflare product names are trademarked. > > > -- > To unsubscribe from this list: send the line "unsubscribe netdev" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >