Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753374Ab1FHDHx (ORCPT ); Tue, 7 Jun 2011 23:07:53 -0400 Received: from serv2.oss.ntt.co.jp ([222.151.198.100]:49337 "EHLO serv2.oss.ntt.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752691Ab1FHDHw (ORCPT ); Tue, 7 Jun 2011 23:07:52 -0400 Date: Wed, 8 Jun 2011 12:11:28 +0900 From: Takuya Yoshikawa To: Xiao Guangrong Cc: Avi Kivity , Marcelo Tosatti , LKML , KVM Subject: Re: [PATCH 0/15] KVM: optimize for MMIO handled Message-Id: <20110608121128.2caecdb3.yoshikawa.takuya@oss.ntt.co.jp> In-Reply-To: <4DEE205E.8000601@cn.fujitsu.com> References: <4DEE205E.8000601@cn.fujitsu.com> X-Mailer: Sylpheed 3.1.0 (GTK+ 2.24.4; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1394 Lines: 54 On Tue, 07 Jun 2011 20:58:06 +0800 Xiao Guangrong wrote: > The performance test result: > > Netperf (TCP_RR): > =========================== > ept is enabled: > > Before After > 1st 709.58 734.60 > 2nd 715.40 723.75 > 3rd 713.45 724.22 > > ept=0 bypass_guest_pf=0: > > Before After > 1st 706.10 709.63 > 2nd 709.38 715.80 > 3rd 695.90 710.70 > In what condition, does TCP_RR perform so bad? On 1Gbps network, directly connecting two Intel servers, I got 20 times better result before. Even when I used a KVM guest as the netperf client, I got more than 10 times better result. Could you tell me a bit more details of your test? > Kernbech (do not redirect output to /dev/null) > ========================== > ept is enabled: > > Before After > 1st 2m34.749s 2m33.482s > 2nd 2m34.651s 2m33.161s > 3rd 2m34.543s 2m34.271s > > ept=0 bypass_guest_pf=0: > > Before After > 1st 4m43.467s 4m41.873s > 2nd 4m45.225s 4m41.668s > 3rd 4m47.029s 4m40.128s > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/