From: Shirley Ma <mashirle@us.ibm.com>
To: David Miller <davem@davemloft.net>
Cc: mst@redhat.com, Eric Dumazet <eric.dumazet@gmail.com>,
Avi Kivity <avi@redhat.com>, Arnd Bergmann <arnd@arndb.de>,
netdev@vger.kernel.org, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH V3 0/8] macvtap/vhost TX zero copy support
Date: Fri, 22 Apr 2011 10:52:53 -0700 [thread overview]
Message-ID: <1303494773.10632.22.camel@localhost.localdomain> (raw)
In-Reply-To: <1303328216.19336.18.camel@localhost.localdomain>
On Wed, 2011-04-20 at 12:36 -0700, Shirley Ma wrote:
> I am collecting more test results against 2.6.39-rc3 kernel and will
> provide the test matrix later.
Single TCP_STREAM 120 secs test results over ixgbe 10Gb NIC results:
Message BW(Gb/s)qemu-kvm (NumCPU)vhost-net(NumCPU) PerfTop irq/s
4K 7408.57 92.1% 22.6% 1229
4K(Orig)4913.17 118.1% 84.1% 2086
8K 9129.90 89.3% 23.3% 1141
8K(Orig)7094.55 115.9% 84.7% 2157
16K 9178.81 89.1% 23.3% 1139
16K(Orig)8927.1 118.7% 83.4% 2262
64K 9171.43 88.4% 24.9% 1253
64K(Orig)9085.85 115.9% 82.4% 2229
For message size less or equal than 2K, there is a known KVM guest TX
overrun issue. With this zerocopy patch, the issue becomes more severe,
guest io_exits has tripled than before, so the performance is not good.
Once the TX overrun problem has been addressed, I will retest the small
message size performance.
Thanks
Shirley
prev parent reply other threads:[~2011-04-22 17:53 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-20 19:36 [PATCH V3 0/8] macvtap/vhost TX zero copy support Shirley Ma
2011-04-20 19:42 ` [PATCH V3 1/8] Add a new sock zerocopy flag Shirley Ma
2011-04-20 19:44 ` [PATCH V3 2/8] Add a new zerocopy device flag Shirley Ma
2011-04-20 19:48 ` Ben Hutchings
2011-04-20 20:05 ` Shirley Ma
2011-04-20 20:09 ` Shirley Ma
2011-04-20 20:24 ` Dimitris Michailidis
2011-04-20 20:28 ` Shirley Ma
2011-04-20 20:30 ` Shirley Ma
2011-05-02 10:42 ` Michael S. Tsirkin
2011-05-02 18:47 ` Shirley Ma
2011-05-02 19:53 ` Michael S. Tsirkin
2011-05-03 17:42 ` Shirley Ma
2011-05-03 20:11 ` Shirley Ma
2011-04-20 19:47 ` [PATCH V3 3/8] Add userspace buffers support in skb Shirley Ma
2011-05-02 10:53 ` Michael S. Tsirkin
2011-05-03 17:36 ` Shirley Ma
2011-04-20 20:07 ` [PATCH V3 4/8] vhost TX zero copy support Shirley Ma
2011-04-20 20:12 ` [PATCH V3 0/8] macvtap/vhost " Shirley Ma
2011-04-20 20:13 ` [PATCH V3 5/8] Enable cxgb3 to support zerocopy Shirley Ma
2011-04-20 20:52 ` Dimitris Michailidis
2011-04-20 20:58 ` Shirley Ma
2011-04-20 21:15 ` Shirley Ma
2011-04-20 20:15 ` [PATCH V3 7/8] Enable ixgbe " Shirley Ma
2011-04-20 20:17 ` [PATCH V3 8/8] Enable benet " Shirley Ma
2011-04-20 20:27 ` [PATCH V3 6/8] macvtap/vhost TX zero copy support Shirley Ma
2011-05-02 18:35 ` Shirley Ma
2011-04-21 14:29 ` [PATCH V3 0/8] " Jon Mason
2011-04-22 17:31 ` Shirley Ma
2011-04-22 17:52 ` Shirley Ma [this message]
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