Thank you for the suggestion. Switching to virtio and/or e1000 helped but still was not able to exceed 450Mb/s. It took me awhile to figure out you had to either restart or reload libvirtd for the changes to take effect. Is there anything else I could check/change to approach 1000Mb/s or higher?
Thank you,
Bryan Coleman
| "Daniel P. Berrange"
<berrange@xxxxxxxxxx>
Sent by: libvir-list-bounces@xxxxxxxxxx 03/12/2009 09:42 AM
|
|
On Thu, Mar 12, 2009 at 09:28:56AM -0400, Bryan_Coleman@xxxxxxxx wrote:
> How do I change the networking speed provided to my qemu-kvm guest? I
> have four gigabit ports bonded; however, my guest is showing just 100Mb/s.
> I have used iperf to confirm.
The reported 'speed' setting for emulated NICs is basically irrelevant
since this is emulated hardware. The original real hardware may have
been specced as 100mb/s, but that has no bearing on its speed in a
virtual environment. The QEMU emulated devices will send/recv data until
the hit a bottleneck, typically the CPU usage of the QEMU process is
hit first. So you want a NIC that entails a low CPU overhead in QEMU.
In order of prefernce you'll want to try virtio, e1000, rtl8139, ne2k_pci
This can be set in libvirt xml with <model type='virtio'/> in the guest
XML <interface> section. Obviously you need to adjust your guest OS to
load correct drivers to match.
Regards,
Daniel
--
|: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :|
|: http://libvirt.org -o- http://virt-manager.org -o- http://ovirt.org :|
|: http://autobuild.org -o- http://search.cpan.org/~danberr/ :|
|: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|
--
Libvir-list mailing list
Libvir-list@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/libvir-list
-- Libvir-list mailing list Libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list