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

[Omar Schiaratura <schiarat@xxxxxxxxx>]

I think this solution is usefull if you have a full virtualization environment, 
in my case i used a xenolinux kernel in domU, so i already had the 
paravirtualized network driver.
when i use my sun nxge 10Gb nic i reached a poor performance of up to 50 Mb/s.
Using another nic suc as a 100 Mb or 1Gb ethernet, the performance reached the 
maximum bandwidth of (respectively) 100 M/s or 1Gb/s


 
Alle mercoledà 6 febbraio 2008, Riccardo Veraldi ha scritto:
> 
> 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
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
> >   
> 
> 
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> http://lists.xensource.com/xen-users
> 



-- 
_____________________________________
Ing. Omar Schiaratura
Dottore in Scienze dell'Informazione

Expert software Engineer
Distribuited Computing group - CRS4
Email: omar@xxxxxxx
http://www.crs4.it/
http://www.omarschiaratura.it/
Tel.: +39 070 9250 286
Cell.: +39 328 3061860
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