[Xen-users] big latency, packet losses with HVM guests

["Tomasz Chmielewski" <mangoo@xxxxxxxx>]

Networking in Windows (2003 R2) looks a bit problematic:

1. Latency is very big - this is made from domU, there is almost no load
on dom0 and domU (Windows):

# ping 192.168.111.186
PING 192.168.111.186 (192.168.111.186) 56(84) bytes of data.
64 bytes from 192.168.111.186: icmp_seq=1 ttl=128 time=4.06 ms
64 bytes from 192.168.111.186: icmp_seq=2 ttl=128 time=4.82 ms
64 bytes from 192.168.111.186: icmp_seq=3 ttl=128 time=6.25 ms
64 bytes from 192.168.111.186: icmp_seq=4 ttl=128 time=7.70 ms
64 bytes from 192.168.111.186: icmp_seq=5 ttl=128 time=9.14 ms
64 bytes from 192.168.111.186: icmp_seq=6 ttl=128 time=0.580 ms
64 bytes from 192.168.111.186: icmp_seq=7 ttl=128 time=2.01 ms
64 bytes from 192.168.111.186: icmp_seq=8 ttl=128 time=3.49 ms
64 bytes from 192.168.111.186: icmp_seq=9 ttl=128 time=4.89 ms
64 bytes from 192.168.111.186: icmp_seq=10 ttl=128 time=6.33 ms

--- 192.168.111.186 ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9000ms
rtt min/avg/max/mdev = 0.580/4.931/9.144/2.437 ms


For non-HVM guests I have latency of about 0.074 ms.


2. There are slight packet losses:

# ping -c 10000 -f 192.168.111.186
PING 192.168.111.186 (192.168.111.186) 56(84) bytes of data.
................
--- 192.168.111.186 ping statistics ---
10000 packets transmitted, 9984 received, 0% packet loss, time 4708ms
rtt min/avg/max/mdev = 0.295/0.400/9.534/0.345 ms, ipg/ewma 0.470/0.438 ms


For non-HVM guestes I have no packet losses.


Is it because of the qemu/realtek network driver?


-- 
Tomasz Chmielewski
http://wpkg.org



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