From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tomasz Chmielewski Subject: Re: strange guest slowness after some time Date: Wed, 01 Apr 2009 08:21:53 +0200 Message-ID: <49D30801.5020201@wpkg.org> References: <49B29705.6000904@wpkg.org> <49B4E7A6.3090601@redhat.com> <49B4EDC9.9020504@wpkg.org> <49B4EE8F.7050001@redhat.com> <49BD007C.9030809@wpkg.org> <49BF7FB6.9080503@wpkg.org> <49BF8686.5050707@redhat.com> <49BF88BE.7040805@wpkg.org> <49BFC276.1080600@gmx.net> <49BFC53D.3020809@wpkg.org> <49BFD752.9050706@gmx.net> <49D1D950.7040809@wpkg.org> <49D2EBF2.1070706@cisco.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: Felix Leimbach , avi@redhat.com, kvm@vger.kernel.org, Rusty Russell , Anthony Liguori To: "David S. Ahern" Return-path: Received: from mx03.syneticon.net ([78.111.66.105]:42237 "EHLO mx03.syneticon.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754104AbZDAGWB (ORCPT ); Wed, 1 Apr 2009 02:22:01 -0400 In-Reply-To: <49D2EBF2.1070706@cisco.com> Sender: kvm-owner@vger.kernel.org List-ID: David S. Ahern schrieb: >>>> Could you add a (unused) e1000 interface to your virtio guests? >>>> As this issue happens rarely for me, maybe you could help to >>>> reproduce it as well (i.e. if network gets slow on virtio interface, >>>> give e1000 a IP address, and try if network is also slow on e1000 on >>>> the very same guest). >>> Will do and report >>>> BTW, what CPU do you have? >>> One dual core Opteron 2212 >>> Note: I will upgrade to two Shanghai Quad-Cores in 2 weeks and test >>> with those as well. >> I have this "slowness" on an Intel CPU as well, after about 10 days of >> guest uptime (using virtio net): >> >> processor : 1 >> vendor_id : GenuineIntel >> cpu family : 6 >> model : 15 >> model name : Intel(R) Xeon(R) CPU 3050 @ 2.13GHz > For the Intel server, the guest is using the e1000 NIC or virtio or > other? I have a few DL320G5s with this processor; I have not hit this > problem running rhel3 and rhel4 guests using e1000/scsi devices. As I mentioned, it was using virtio net. Guests running with e1000 (and virtio_blk) don't have this problem. -- Tomasz Chmielewski http://wpkg.org