[Xen-users] XEN 4.3.1 network performance issue

["NiX" <nix@xxxxxxxxxxxxxxxx>]

Hi. I am running a XEN VM in PV mode. This VM has four cores enabled. VM
network config is as follows:

vif = ["ip=127.0.0.1,mac=XX:XX:XX:XX:XX:XX,bridge=br0,rate=100Mb/s"]

Dom0 is dual XEON X5450 with 16GB of RAM.

I can barely zmap at 10mbps ~ 12k packets/second on this VM

Dec 24 16:56:43.393 [WARN] monitor: Failed to send 1502 packets/sec
(998980 total failures)

13:04 0% (1d20h left); send: 9335298 11.9 Kp/s (11.9 Kp/s avg); recv: 3509
4 p/s (4 p/s avg); drops: 0 p/s (0 p/s avg); hits: 0.04%

On Dom0 netback/0 utilize pretty much one core (95% CPU). While zmap is
running at about 10mbps, everything starts lagging on SSH console when
typing commands. I tried anything above 10mbps and I cannot no longer type
at all any commands with a reasonable delay on SSH console...

Dom0 is using bridged network. Is there anything that can be done to
improve performance?

Dom0 is attached to 1gbps network so I am 100% sure that the network is
not a bottleneck.

I got the following speed on Dom0 while zmap was running:

Connecting to caesar.acc.umu.se (caesar.acc.umu.se)|130.239.18.142|:80...
connected.
HTTP request sent, awaiting response... 200 OK
Length: 679477248 (648M) [application/x-iso9660-image]
Saving to: `debian-7.3.0-i386-CD-1.iso'
679,477,248 20.1M/s   in 23s


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