From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Lemoine Subject: Re: LLTX and netif_stop_queue Date: Mon, 3 Jan 2005 17:41:05 +0100 Message-ID: <5cac192f05010308414a25b548@mail.gmail.com> References: <52llbwoaej.fsf@topspin.com> <5cac192f04122210491d64d4b6@mail.gmail.com> <20041222202919.057b8331.davem@davemloft.net> <5cac192f0412230110628749e3@mail.gmail.com> <41CAF444.3000305@trash.net> <5cac192f04122408102129af43@mail.gmail.com> <1104240717.1100.66.camel@jzny.localdomain> <5cac192f0501021530672a908a@mail.gmail.com> <1104764660.1048.578.camel@jzny.localdomain> <52brc68q05.fsf@topspin.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: netdev@oss.sgi.com, hadi@cyberus.ca, Andi Kleen , openib-general@openib.org, Patrick McHardy , "David S. Miller" Return-path: To: Roland Dreier In-Reply-To: <52brc68q05.fsf@topspin.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: openib-general-bounces@openib.org Errors-To: openib-general-bounces@openib.org List-Id: netdev.vger.kernel.org On Mon, 03 Jan 2005 07:57:14 -0800, Roland Dreier wrote: > jamal> Andi or anyone else - has anyone really done perfomance > jamal> analysis of LLTX (with anything other than loopback) and > jamal> shown it has any value? Maybe time to just shoot the damn > jamal> thing. > > For the IPoIB driver, it seems to be worth a couple percent. It's > hard to get really consistent results but on my pair of test systems, > TCP throughput with netperf goes up by about 30 Mbps out of roughly > 1900 Mbps total. It's probably not worth the complexity in the net > core if all drivers only get that level of improvement. > > - Roland > What are your machines? In particular, how many CPUs do they have? -- Eric