[CentOS-virt] Moving vmware guests to a CentOS KVM server

Kenni Lund kenni at kelu.dk
Sat Feb 20 01:41:44 UTC 2010

2010/2/18 compdoc <compdoc at hotrodpc.com>:
> I would also just use the e1000 emulation. Theres nothing
> better about the virtio devices...

...other than lower CPU utilization and higher throughout? Since these
are CentOS/RHEL guests, I wouldn't even consider using e1000, I would
just go for virtio_net.

I don't have any links, but some time ago there were some benchmarks
(on the KVM development list?), showing the e1000 maxing out at around
300-400mbit/s while the virtio got around 900mbit/s. Even with the
much higher throughput, the virtio_net driver still had the same or
lower CPU utilization.

Do your own testing if in doubt.

Best Regards
Kenni Lund

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