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Date: Sun, 18 Jan 2009 19:28:15 -0800 (PST) From: David Miller <davem@...emloft.net> To: w@....eu Cc: herbert@...dor.apana.org.au, jarkao2@...il.com, zbr@...emap.net, dada1@...mosbay.com, ben@...s.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 From: Willy Tarreau <w@....eu> Date: Mon, 19 Jan 2009 01:42:06 +0100 > Hi guys, > > On Thu, Jan 15, 2009 at 03:54:34PM -0800, David Miller wrote: > > From: Willy Tarreau <w@....eu> > > Date: Fri, 16 Jan 2009 00:44:08 +0100 > > > > > And BTW feel free to add my Tested-by if you want in case you merge > > > this fix. > > > > Done, thanks Willy. > > 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) > > - 9.2 Gbps at 50% CPU using MTU=1500 with LRO > > - 10 Gbps at 20% CPU using MTU=9000 without LRO (7 Gbps at 100% CPU without > splice) > > - 10 Gbps at 15% CPU using MTU=9000 with LRO Thanks for the numbers. We can almost certainly do a lot better, so if you have the time and can get some oprofile dumps for these various cases that would be useful to us. Thanks again. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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