[Xen-users] Re: Network receive performance of Xen

[Jens Kleikamp <jens@xxxxxxxxxxxxxxxxxx>]

Sahan Gamage schrieb:
> Hi All,
>
> I am doing some experiments on network performance of Xen in
> uniprocessor environment. I use both iperf and netperf to measure the
> TCP transmit and receive performance of domU and I see some strange
> asymmetric behavior. The other end of the TCP pipe in these scenarios
> is a non-virtualized machine.  For transmit I can see about 900 Mbps
> and for receive performance I can only see around 400 Mbps.
> I searched the web and mailing lists regarding this issue. A
> presentation I found [1] suggests I should see equal performance for
> both Tx and Rx. But there are some questions in the mailing lists
> which suggests otherwise [2], [3]
>
> My machine setup is :
> Processor : Intel P4 at 3Ghz (HT disabled)
> Mem : 2GB
> Dom0 and DomU OS : Debian Etch (Linux kernel 2.6.18-6 with Xen pathces)
> Xen version: 3.0.3
>
> Has anyone experienced same problem ? Is this a result of misconfiguration ?
>
> Thanks in advance
> -sahan
>
> [1] http://xen.org/files/xensummit_fall07/16_JoseRenatoSantos.pdf
> [2] http://lists.xensource.com/archives/html/xen-users/2007-06/msg00004.html
> [3] http://lists.xensource.com/archives/html/xen-users/2006-04/msg00096.html
>
> P.S: I tried most of the workarounds (changing the scheduler to EDF,
> assigning priorities, changing txqueuelen on vifx.x)
3.0.3 is pretty old. Why not try with a newer version of xen?



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