From: Fabian Deutsch <fabian.deutsch@gmx.de>
To: kvm@vger.kernel.org
Subject: massive performance drop after a while when using virtio nics
Date: Sat, 23 Aug 2008 21:21:56 +0200 [thread overview]
Message-ID: <1219519317.2909.12.camel@decade.local> (raw)
Hey.
When running a guest in the following setup, I observ a "massive"
performance decrease after a couple of gigabytes of transfrerred data.
other guests keep running fine (no regressions) and nothing unusual is
observed on the host.
fedora 8 host, kvm-72 (user and module)
fedora 9 guest, all updates.
nic 0, vtio:
subnet a
samba listening
nic 1, vtio:
subnet b
iscsi initiator running
samba shares a mount point, pointing to an iscsi target.
now pulling/pushing about 80GB over samba results in a drop from about
60/70Mbit to about 1/2Mbit of troughput.
The problem is reproducible.
The problem is solved after a reboot of the guest. Just restarting
networking doesn't help.
Guest's dmesg doesn't say anything about problems. No errors in
ifconfig.
Has someone observed something similar?
Greetings
- fabian
next reply other threads:[~2008-08-23 19:22 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-23 19:21 Fabian Deutsch [this message]
2008-09-08 12:07 ` massive performance drop after a while when using virtio nics Yann Dupont
2008-09-08 13:16 ` Fabian Deutsch
2008-09-08 13:33 ` Yann Dupont
2008-09-09 10:22 ` Mark McLoughlin
2008-09-09 10:32 ` Fabian Deutsch
2008-09-09 10:47 ` Mark McLoughlin
2008-09-09 11:11 ` Henrik Holst
2008-09-09 11:41 ` Mark McLoughlin
2008-09-09 11:54 ` Yann Dupont
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