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/ _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
