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Message-ID: <20091229140743.GC10234@redhat.com> Date: Tue, 29 Dec 2009 16:07:43 +0200 From: "Michael S. Tsirkin" <mst@...hat.com> To: Gregory Haskins <gregory.haskins@...il.com> Cc: Avi Kivity <avi@...hat.com>, Andi Kleen <andi@...stfloor.org>, kvm@...r.kernel.org, Bartlomiej Zolnierkiewicz <bzolnier@...il.com>, netdev@...r.kernel.org, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Anthony Liguori <anthony@...emonkey.ws>, Ingo Molnar <mingo@...e.hu>, torvalds@...ux-foundation.org, Andrew Morton <akpm@...ux-foundation.org> Subject: vhost net on 10ge with x2apic Got hold of some 10Ge cards and did some light benchmarking of kvm networking with and without vhost net accelerator, while enabling x2apic emulation. I've put a summary of results here: http://www.linux-kvm.org/page/VhostNet#Performance Main conclusions: vhost net improves latency (a lot) and bandwidth/cpu utilization (less). With x2apic and a recent guest, virtio userspace has decent bandwidth but high latency and cpu utilization. vhost net bandwidth can get very close to native bandwidth (95%). We still have work to do tuning virtio guest drivers. -- MST -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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