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

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Message-ID: <1381883311.2045.87.camel@edumazet-glaptop.roam.corp.google.com>
Date:	Tue, 15 Oct 2013 17:28:31 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Sébastien Dugué <sebastien.dugue@...l.net>,
	Neil Horman <nhorman@...driver.com>,
	linux-kernel@...r.kernel.org, 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 Tue, 2013-10-15 at 18:02 +0200, Andi Kleen wrote:
> > I get the csum_partial() if disabling prequeue.
> 
> At least in the ipoib case i would consider that a misconfiguration.

There is nothing you can do, if application is not blocked on recv(),
but using poll()/epoll()/select(), prequeue is not used at all.

In this case, we need to csum_partial() frame before sending an ACK,
don't you think ? ;)



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