From mboxrd@z Thu Jan 1 00:00:00 1970 From: yingbin wang Subject: Re: network performance drop heavily in xen 4.0 release Date: Fri, 16 Apr 2010 12:24:12 +0800 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Keir Fraser Cc: "xen-devel@lists.xensource.com" List-Id: xen-devel@lists.xenproject.org sorry, I forgot to report the performance of xen4.0+kernel2.6.18.8. xen4.0+kernel2.6.18.8: [ ID] Interval Transfer Bandwidth [ 4] 0.0-16.3 sec 1.79 GBytes 941 Mbits/sec This combination can only meet some of our needs. the reason why we didn't use 2.6.18.8: 1. Our storage application is base on NBD, which will goto deadlock on 2.6.18.8 when nbd-client and nbd-server are deployed on the same server. 2. Hard disk frequently offline so we want to upgrade to kernel2.6.31. we also try xen4.0+kernel2.6.31.12(gentoo-xen-kernel patch). the performance is acceptable, but blktap2(support VHD) not work. has anybody solve the problem in xen4.0+kernel2.6.31.13? Cheers, wyb 2010/4/16 Keir Fraser : > On 15/04/2010 17:39, "yingbin wang" wrote: > >> =A0 =A0 I report a Bug !!! =A0We have just upgraded to >> xen4.0+kernel2.6.31.13 recently. =A0however , fond that the network >> performance drop heavily in dom0 =A0(nearly Reduced by 2/3 vs >> xen3.4.2+kernel2.6.18.8 ) . > > How does xen4.0+kernel2.6.18.8 perform? The regression is more likely in = the > dom0 kernel than Xen itself. And you don't *have* to upgrade both. > > =A0-- Keir > > >