Fabian Deutsch a écrit :
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
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We just saw the very same issue.
guest & host : 2.6.25.3, debian etch 64 bits
KVM 70 on this machine.
As fabian said, rebooting the kernel doesn't help, but rebooting the
whole kvm guest does.
No error messages as far as I can tell. The kvm guest is a clonezilla
server and send lots of data.
It began to crawl after 2/3 weeks of usage.
Greetings,
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Yann Dupont - Service IRTS, DSI Université de Nantes
Tel : 02.51.12.53.91 - Mail/Jabber : [EMAIL PROTECTED]
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