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From: Ben-Ami Yassour <benami@il.ibm.com>
To: kvm@vger.kernel.org
Cc: markmc@redhat.com, Anthony Liguori <aliguori@us.ibm.com>,
	Muli Ben-Yehuda <MULI@il.ibm.com>
Subject: virtio performance issue
Date: Tue, 16 Sep 2008 17:14:01 +0300	[thread overview]
Message-ID: <1221574441.26630.19.camel@cluwyn.haifa.ibm.com> (raw)

I am running virtio with the latest KVM code, and see a significant
performance issue.

Ping to the host (or any other close machine) reports a 4ms delay.

In the same setup with an e1000 emulation (just changing model=virtio to
model=e1000 in the KVM command line), ping reports 0.177ms delay.

BTW, initially I saw that the throughput when using netperf is very low,
even from guest to host, even though the CPU utilization is low.

What might be the problem?

Thanks,
Ben


             reply	other threads:[~2008-09-16 14:14 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-09-16 14:14 Ben-Ami Yassour [this message]
2008-09-16 14:16 ` virtio performance issue Anthony Liguori
2008-09-16 19:24   ` Ben-Ami Yassour
2008-09-17 10:49     ` Mark McLoughlin
2008-09-17 12:10       ` Ben-Ami Yassour
2008-09-16 17:43 ` Bernhard Schmidt

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