From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rusty Russell Subject: Re: performance regression in virtio-net in 2.6.32-rc4 Date: Wed, 28 Oct 2009 10:04:46 +1030 Message-ID: <200910281004.46800.rusty@rustcorp.com.au> References: <20091026184835.GB26473@redhat.com> Mime-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Cc: virtualization@lists.linux-foundation.org, kvm@vger.kernel.org, netdev@vger.kernel.org To: "Michael S. Tsirkin" Return-path: In-Reply-To: <20091026184835.GB26473@redhat.com> Content-Disposition: inline Sender: kvm-owner@vger.kernel.org List-Id: netdev.vger.kernel.org On Tue, 27 Oct 2009 05:18:35 am Michael S. Tsirkin wrote: > Hi! > I noticed a performance regression in virtio net: going from > 2.6.31 to 2.6.32-rc4 I see this, for guest to host communication: ... > Size Size Size Time Throughput > bytes bytes bytes secs. 10^6bits/sec > > 87380 16384 16384 10.20 7806.48 ... > 87380 16384 16384 10.00 6814.60 Hmm, needs a bisect I'd say. Thanks, Rusty.