Re: [Xen-users] nic poor performance after upgrade to xen 3.2

[Riccardo Veraldi <Riccardo.Veraldi@xxxxxxxxxxxx>]

I think you use netfront to achieve such performances on domU
so you have to recompile in unmodified_drivers/linux-2.6  from Xen 
sources under your domU
and load the kernel modules at boot time

xen-vnif.ko xen-platform-pci.ko xen-vbd.ko xen-balloon.ko

you must alias eth0 xen-vnif in modprobe.conf and of couse use netfront 
instead of ioemu
in the vif part of your guest config file. But I think this step is 
already done on your guest
otherwise you cannot achieve such a speed with vif type set to ioemu.

Riccardo




Omar Schiaratura ha scritto:
> Hi,
> I'm doing some test on a network 10 gb nics and xen
> with version 3.1 i'm measuring 2.5 gb/sec from domU to an external physical 
> machine with iperf.
> switching to 3.2 has reduced the measured performance to 40-50 Mb/sec.
>
> did anything change in the network interface?
>
> can someone help me?
>
> thanks
>
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