From: "Michael S. Tsirkin" <mst@redhat.com>
To: Gregory Haskins <gregory.haskins@gmail.com>
Cc: Avi Kivity <avi@redhat.com>, Andi Kleen <andi@firstfloor.org>,
kvm@vger.kernel.org,
Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>,
netdev@vger.kernel.org,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Anthony Liguori <anthony@codemonkey.ws>,
Ingo Molnar <mingo@elte.hu>,
torvalds@linux-foundation.org,
Andrew Morton <akpm@linux-foundation.org>
Subject: vhost net on 10ge with x2apic
Date: Tue, 29 Dec 2009 16:07:43 +0200 [thread overview]
Message-ID: <20091229140743.GC10234@redhat.com> (raw)
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
reply other threads:[~2009-12-29 14:11 UTC|newest]
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