Hi,
I'm running some tests between two linux instances bridged together.
If I try to ping 10 times I obtain the following results:
-net nic,model=virtio -net tap :
rtt min/avg/max/mdev = 0.756/0.967/2.115/0.389 ms
-net nic,model=rtl8139 -net tap :
rtt min/avg/max/mdev = 0.301/0.449/1.173/0.248 ms
So it seems with virtio the latency is higher. Is it normal?
The results I'm reporting were obtained with
- host
qemu-kvm 0.11-rc2
kvm-kmod-2.6.30.1
kernel: 2.6.30.5 (HIGH_RES_TIMERS=y as suggested in
http://www.linux-kvm.org/page/Virtio )
- guest
kernel: 2.6.31
but I also tested older versions always obtaining latency values at least two
times higher than rtl8139/e1000 .
Thank you,
Luca
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