linux-kernel - Re: [PATCH] x86: Run checksumming in parallel accross multiple alu's

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Message-ID: <20131014202528.GG26880@hmsreliant.think-freely.org>
Date:	Mon, 14 Oct 2013 16:25:28 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org, sebastien.dugue@...l.net,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Subject: Re: [PATCH] x86: Run checksumming in parallel accross multiple alu's

On Sun, Oct 13, 2013 at 09:38:33PM -0700, Andi Kleen wrote:
> Neil Horman <nhorman@...driver.com> writes:
> 
> > Sébastien Dugué reported to me that devices implementing ipoib (which don't have
> > checksum offload hardware were spending a significant amount of time computing
> 
> Must be an odd workload, most TCP/UDP workloads do copy-checksum
> anyways. I would rather investigate why that doesn't work.
> 
FWIW, the reporter was reporting this using an IP over Infiniband network.
Neil

> That said the change looks reasonable, but may not fix the root cause.
> 
> -Andi
> 
> -- 
> ak@...ux.intel.com -- Speaking for myself only
> 
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