[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Xen3 domU network packet loss (udp iperf)
On Wed, Mar 22, 2006 at 06:44:52PM -0500, Andrew D. Ball wrote: > I wonder if this is why I've never seen a domU kernel finish booting > with ip="dhcp" in the Python configuration file. > > This translates to an "ip=:::::eth0:dhcp" kernel parameter, so the domU > seems to be using the DHCP client embedded in the Linux kernel. > > It always times out for me, but I haven't found time to dig deeper into > what's going wrong. > > Has anyone else had better luck? > I also noticed that when doing both the incoming and outgoing transfers simultaneously, the incoming speed to domU is 1/2 of the speed of outgoing speed (or even lower). with iperf "Do a bidirectional test simultaneously" test: outside -> domU: 175 Mbits/sec domU -> outside: 392 Mbits/sec What could explain that? - Pasi > Thanks for your help. > Andrew > ============= > Andrew D. Ball <aball@xxxxxxxxxx> > > Pasi Kärkkäinen wrote: > >And you won't notice this packet loss with TCP, because TCP automatically > >re-transmits the missing packets.. TCP speed does suffer, however. > > > >Others seeing this? > > > >- Pasi > > > >On Sat, Mar 18, 2006 at 03:04:13PM +0200, Pasi Kärkkäinen wrote: > > > >>Hi! > >> > >>Please check out this URL: http://nrg.joroinen.fi/xen-ploss.txt > >> > >>There you have UDP iperf results to and from domU and dom0. > >> > >>It seems xen causes packet loss to domU's.. dom0 works well without packet > >>loss. > >> > >>Is this known problem? I'm using bridged networking with xen. > >> > >>Both the xen box, and the external non-xen box were P4 3.0+ GHz, using > >>gigabit NIC's (tg3 and e1000). > >> > >>in the xen box, all the physical network interfaces (tg3) have rx and tx > >>checksumming on. > >> > >>I'm using xen 3 unstable from 2006-02-04. > >> > >>-- Pasi > >> > > > > > >_______________________________________________ > >Xen-devel mailing list > >Xen-devel@xxxxxxxxxxxxxxxxxxx > >http://lists.xensource.com/xen-devel > > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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