netdev - Re: [PATCH v2 net-next] net: Implement fast csum_partial for x86

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Message-ID: <1452092580.8255.183.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Wed, 06 Jan 2016 07:03:00 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Laight <David.Laight@...LAB.COM>
Cc:	Tom Herbert <tom@...bertland.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"kernel-team@...com" <kernel-team@...com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH v2 net-next] net: Implement fast csum_partial for x86_64

On Wed, 2016-01-06 at 14:49 +0000, David Laight wrote:

> Someone also pointed out that the code is memory limited (dual add
> chains making no difference), so why is it unrolled at all?

Because it matters if the data is already present in CPU caches.

So why not unrolling if it helps in some situations ?






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