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Date: Fri, 1 Nov 2013 12:08:02 -0400 From: Neil Horman <nhorman@...driver.com> To: Ben Hutchings <bhutchings@...arflare.com> Cc: Doug Ledford <dledford@...hat.com>, Ingo Molnar <mingo@...nel.org>, Eric Dumazet <eric.dumazet@...il.com>, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, David Laight <David.Laight@...LAB.COM> Subject: Re: [PATCH] x86: Run checksumming in parallel accross multiple alu's 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@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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