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) _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
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? _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users