From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Mon, 19 Jan 2009 14:08:44 +1100

On Mon, Jan 19, 2009 at 01:42:06AM +0100, Willy Tarreau wrote:

quoted

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.

Right.

And this is also the only reason why jumbo MTU worked :-)