From: Stefan Hajnoczi <stefanha@redhat.com>
To: Zhangleiqiang <zhangleiqiang@huawei.com>
Cc: Stefan Hajnoczi <stefanha@gmail.com>,
"Luohao (brian)" <brian.luohao@huawei.com>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
Haofeng <haofeng@huawei.com>, leiqzhang <leiqzhang@gmail.com>
Subject: Re: [Qemu-devel] 答复: question about performance of dataplane
Date: Thu, 4 Apr 2013 09:20:38 +0200 [thread overview]
Message-ID: <20130404072038.GA24402@stefanha-thinkpad.redhat.com> (raw)
In-Reply-To: <3A6795EA1206904E94BEC8EF9DF109AE05D38653@szxeml510-mbx.china.huawei.com>
On Tue, Apr 02, 2013 at 02:02:54AM +0000, Zhangleiqiang wrote:
> I have also finished the perf testing under Fedora 17 using IOZone, and the results also shown that the performance of disk with dataplane enabled did not have advantage over non-dataplane.
virtio-blk data plane is a win for parallel I/O workloads (that means
iodepth > 1). The advantage becomes clearer with SMP guests.
In other words the big advantage is that data plane processes requests
without blocking the QEMU main loop or vCPU threads.
If your guest has 1 vCPU and/or your benchmarks only do a single stream
of I/O requests, then the difference may not be measurable.
Stefan
next prev parent reply other threads:[~2013-04-04 7:21 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-26 15:10 [Qemu-devel] dataplane bug: fail to start Windows VM with dataplane enable 张磊强
2013-03-27 13:32 ` Stefan Hajnoczi
2013-03-27 14:02 ` Stefan Hajnoczi
2013-03-27 15:15 ` Stefan Hajnoczi
2013-03-27 15:41 ` Stefan Hajnoczi
2013-03-28 4:03 ` [Qemu-devel] 回复： " leiqzhang
2013-04-01 13:34 ` [Qemu-devel] question about performance of dataplane Zhangleiqiang
2013-04-02 2:02 ` [Qemu-devel] 答复: " Zhangleiqiang
2013-04-04 7:20 ` Stefan Hajnoczi [this message]
2013-04-07 11:31 ` [Qemu-devel] 答复: " Zhangleiqiang
2013-04-07 11:42 ` Abel Gordon
2013-04-07 13:34 ` [Qemu-devel] 答复: " Zhangleiqiang
2013-04-07 14:01 ` Abel Gordon
[not found] ` <CAO-gD_kYmnph95UGUVbGBcvNqZ4zKDbzBdRXh+MD7KSoZFgyrw@mail.gmail.com>
[not found] ` <OF71AA8EBF.56A0BFE1-ONC2257B46.0059C6C3-C2257B46.005B8DA6@il.ibm. <3A6795EA1206904E94BEC8EF9DF109AE05D3AD3F@szxeml510-mbx.china.huawei.com>
2013-04-07 16:40 ` Abel Gordon
2013-04-08 9:06 ` [Qemu-devel] 答复: " Zhangleiqiang
2013-04-08 11:04 ` Abel Gordon
2013-04-08 11:13 ` Zhangleiqiang
2013-04-08 11:31 ` Abel Gordon
2013-04-07 14:05 ` [Qemu-devel] " Anthony Liguori
2013-04-08 3:13 ` [Qemu-devel] 答复: " Zhangleiqiang
2013-04-08 11:08 ` [Qemu-devel] " Stefan Hajnoczi
2013-04-08 13:01 ` Zhangleiqiang
2013-04-09 11:49 ` Stefan Hajnoczi
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