From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sridhar Samudrala Subject: Re: [RFC PATCH] Regression in linux 2.6.32 virtio_net seen with vhost-net Date: Wed, 16 Dec 2009 21:02:50 -0800 Message-ID: <4B29BB7A.8000307@us.ibm.com> References: <20091213122512.GA17255@gondor.apana.org.au> <200912161311.40644.rusty@rustcorp.com.au> <20091216025331.GA13935@gondor.apana.org.au> <200912162315.38802.rusty@rustcorp.com.au> <1261014180.11648.35.camel@w-sridhar.beaverton.ibm.com> <20091217031233.GA26027@gondor.apana.org.au> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Rusty Russell , mst@redhat.com, netdev@vger.kernel.org To: Herbert Xu Return-path: Received: from e38.co.us.ibm.com ([32.97.110.159]:59167 "EHLO e38.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750912AbZLQFDK (ORCPT ); Thu, 17 Dec 2009 00:03:10 -0500 Received: from d03relay03.boulder.ibm.com (d03relay03.boulder.ibm.com [9.17.195.228]) by e38.co.us.ibm.com (8.14.3/8.13.1) with ESMTP id nBH4wAB9025403 for ; Wed, 16 Dec 2009 21:58:10 -0700 Received: from d03av03.boulder.ibm.com (d03av03.boulder.ibm.com [9.17.195.169]) by d03relay03.boulder.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id nBH52um6163130 for ; Wed, 16 Dec 2009 22:02:57 -0700 Received: from d03av03.boulder.ibm.com (loopback [127.0.0.1]) by d03av03.boulder.ibm.com (8.14.3/8.13.1/NCO v10.0 AVout) with ESMTP id nBH52thZ001895 for ; Wed, 16 Dec 2009 22:02:56 -0700 In-Reply-To: <20091217031233.GA26027@gondor.apana.org.au> Sender: netdev-owner@vger.kernel.org List-ID: Herbert Xu wrote: > On Wed, Dec 16, 2009 at 05:43:00PM -0800, Sridhar Samudrala wrote: > >> I had to change virtnet_xmit_poll() to get it working. See below. >> With this change, i don't see any 'queue full' warnings, but requeues >> are still happening at the qdisc level (sch_direct_xmit() finds that >> tx queue is stopped and does requeues). >> > > More importantly how does the performance look? > TCP stream throughput is around the same 3200Mb/sec Thanks Sridhar