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

From: Herbert Xu
Date: Sun Jan 18 2009 - 22:09:35 EST

On Mon, Jan 19, 2009 at 01:42:06AM +0100, Willy Tarreau wrote:
> Just for the record, I've now re-integrated those changes in a test kernel
> that I booted on my 10gig machines. I have updated my user-space code in
> haproxy to run a new series of tests. Eventhough there is a memcpy(), the
> results are EXCELLENT (on a C2D 2.66 GHz using Myricom's Myri10GE NICs) :
> - 4.8 Gbps at 100% CPU using MTU=1500 without LRO
> (3.2 Gbps at 100% CPU without splice)

One thing to note is that Myricom's driver probably uses page
frags which means that you're not actually triggering the copy.

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