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Date: Tue, 20 Jan 2009 14:06:11 +0000
From: Jarek Poplawski <jarkao2@gmail.com>
To: Ben Mansell <ben@zeus.com>
Cc: Evgeniy Polyakov <zbr@ioremap.net>, Willy Tarreau <w@1wt.eu>,
       David Miller <davem@davemloft.net>, herbert@gondor.apana.org.au,
       dada1@cosmosbay.com, mingo@elte.hu, linux-kernel@vger.kernel.org,
       netdev@vger.kernel.org, jens.axboe@oracle.com
Subject: Re: [PATCH] tcp: splice as many packets as possible at once
Message-ID: <20090120140611.GC17004@ff.dom.local>
References: <20090115.153449.204259387.davem@davemloft.net> <20090115234255.GE1123@1wt.eu> <20090115234408.GA1693@1wt.eu> <20090115.155434.206643894.davem@davemloft.net> <20090119004206.GA10396@1wt.eu> <4975BD09.3020103@zeus.com> <20090120121115.GA17277@ioremap.net> <4975D518.1000800@zeus.com>
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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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