netdev - Re: [PATCH] tcp: splice as many packets as possible at once

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Message-ID: <20090120140611.GC17004@ff.dom.local>
Date:	Tue, 20 Jan 2009 14:06:11 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Ben Mansell <ben@...s.com>
Cc:	Evgeniy Polyakov <zbr@...emap.net>, Willy Tarreau <w@....eu>,
	David Miller <davem@...emloft.net>,
	herbert@...dor.apana.org.au, dada1@...mosbay.com, mingo@...e.hu,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	jens.axboe@...cle.com
Subject: Re: [PATCH] tcp: splice as many packets as possible at once

On Tue, Jan 20, 2009 at 01:43:52PM +0000, Ben Mansell wrote:
...
> With an unpatched kernel, the splice performance was worse (due to the  
> one packet per-splice issues). With the small patch to fix that, I was  
> getting around 2 Gbps performance, although oddly enough, I could only  
> get 2 Gbps with read()/write() then as well...
>
> I'll try and do some tests on a machine that hopefully doesn't have the  
> bottlenecks (and one that uses different NICs)

I guess you should especially check if SG and checksums are on, and it
could depend on a chip within those NICs as well.

Jarek P. 
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