From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anthony Liguori Subject: Re: [ANNOUNCE] kvm-guest-drivers-windows-2 Date: Wed, 14 May 2008 12:50:01 -0500 Message-ID: <482B2649.2090006@codemonkey.ws> References: <482AEE8D.7000608@wpkg.org> <1210777782.24261.829.camel@localhost.localdomain> <482B09EE.20903@wpkg.org> <1210781968.24261.841.camel@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm-devel@lists.sourceforge.net, Tomasz Chmielewski To: dor.laor@qumranet.com Return-path: In-Reply-To: <1210781968.24261.841.camel@localhost.localdomain> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces@lists.sourceforge.net Errors-To: kvm-devel-bounces@lists.sourceforge.net List-Id: kvm.vger.kernel.org Dor Laor wrote: > On Wed, 2008-05-14 at 17:49 +0200, Tomasz Chmielewski wrote: > >> Dor Laor schrieb: >> >> (...) >> >> >>>> - PV Windows (network driver) >>>> >>> About 700Mb+-, there is currently extra copy that we need to omit. >>> Thanks for Anthony, we just have to change the driver. >>> >>> >>>> - non-PV Windows >>>> >>> What do you mean? Other fully emulated nics like e1000? >>> It does not perform as pv but depending on the guest it can do up to >>> 600Mb+-. >>> >> Just generally, how Windows PV drivers help to improve network performance. >> >> So, a PV network driver can do about 700Mb/s, and an emulated NIC can do about >> 600 Mb/s, Windows guest to host? >> >> That would be about 20% improvement? >> FWIW, virtio-net is much better with my patches applied. The difference between the e1000 and virtio-net is that e1000 consumes almost twice as much CPU as virtio-net so in my testing, the performance improvement with virtio-net is about 2x. We were loosing about 20-30% throughput because of the delays in handling incoming packets. Regards, Anthony LIguori >> > > It's work in progress, doing zero copy in the guest, adding TSO, using > virtio'd tap will drastically boot performance. There is no reason the > performance won't match Linux guest. > Also I don't exactly remember the numbers but the gain in the tx pass is > grater. > > > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2008. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > kvm-devel mailing list > kvm-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/kvm-devel > ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/