From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933648Ab0J2IMS (ORCPT ); Fri, 29 Oct 2010 04:12:18 -0400 Received: from mx1.redhat.com ([209.132.183.28]:20822 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933599Ab0J2IMF (ORCPT ); Fri, 29 Oct 2010 04:12:05 -0400 Date: Fri, 29 Oct 2010 10:11:58 +0200 From: "Michael S. Tsirkin" To: Shirley Ma Cc: Sridhar Samudrala , David Miller , netdev@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [RFC PATCH 1/1] vhost: TX used buffer guest signal accumulation Message-ID: <20101029081158.GC22688@redhat.com> References: <1288216693.17571.38.camel@localhost.localdomain> <1288240804.14342.1.camel@localhost.localdomain> <20101028052021.GD5599@redhat.com> <1288294355.11251.20.camel@localhost.localdomain> <1288296835.11251.24.camel@localhost.localdomain> <1288299878.30131.2.camel@sridhar.beaverton.ibm.com> <1288302050.11251.26.camel@localhost.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1288302050.11251.26.camel@localhost.localdomain> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Oct 28, 2010 at 02:40:50PM -0700, Shirley Ma wrote: > On Thu, 2010-10-28 at 14:04 -0700, Sridhar Samudrala wrote: > > It would be some change in virtio-net driver that may have improved > > the > > latency of small messages which in turn would have reduced the > > bandwidth > > as TCP could not accumulate and send large packets. > > I will check out any latency improvement patch in virtio_net. If that's > the case, whether it is good to have some tunable parameter to benefit > both BW and latency workload? > > Shirley No, we need it to work well automatically somehow. -- MST