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xen-users
Re: [Xen-users] Network performance in virtual machine (good upload spee
This is my output from ifconfig:
lucy:~# ifconfig
eth0 Link encap:Ethernet HWaddr 00:02:A5:0D:09:32
inet addr:192.168.1.10 Bcast:192.168.1.255 Mask:
255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:5951 errors:23 dropped:23 overruns:0 frame:23
TX packets:3630 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:7130145 (6.7 MiB) TX bytes:378644 (369.7 KiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:3606 errors:0 dropped:0 overruns:0 frame:0
TX packets:3606 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:269811 (263.4 KiB) TX bytes:269811 (263.4 KiB)
vif1.0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2547 errors:0 dropped:0 overruns:0 frame:0
TX packets:4773 errors:0 dropped:199 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:175603 (171.4 KiB) TX bytes:6725419 (6.4 MiB)
xen-br0 Link encap:Ethernet HWaddr 00:02:A5:0D:09:32
inet addr:192.168.1.10 Bcast:192.168.1.255 Mask:
255.255.255.255
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1196 errors:0 dropped:0 overruns:0 frame:0
TX packets:1085 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:140820 (137.5 KiB) TX bytes:203365 (198.5 KiB)
Should I perhaps try a lower MTU? I've never worked with bridges in
Linux before, so I'm not sure.
Best regards,
/Martin
28 nov 2005 kl. 01.45 skrev Stephan Seitz:
hi,
networking problems with large MTU's have been recently discussed on
the xen-devel list.
i don't know if this is also relevant for xen 2.0.7, but as a first
step, i would take a look of
the bridge's MTU as well as of the virtual eth device in the domU.
greetings
stephan
Martin Nilsson schrieb:
I have just installed Xen and got a virtual machine up and running.
Everything seems to work fine, except that I get strange network
performance in the virtual machine. When I upload data, I get good
speeds, around 6-7 MB/s which I think is ok on a 100 Mbit network.
When I download however, I only get ~300 KB/s. On the host machine
I get good speed in both direction. The version of Xen is 2.0.7,
and I have tried both the binary release and built my own kernel,
with the same results. The host OS is debian sarge. I really have
no idea where to look for a solution, so every advice I can get is
highly appreciated.
Best regards, /Martin
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