On Mon, Oct 12, 2009 at 11:16:33AM -0700, Collins, Kevin [BEELINE] wrote: > I've seen similar results of only "Link detected" under Xen. If you use > "peth0" instead of "eth0" (or whichever device), it should work fine. I > don't remember the details of what the difference is, but its related to > Xen networking. >
The default 'network-bridge' script in Xen does some magic: it renames the real physical eth0 nic to peth0, and creates a virtual device called eth0, and then both physical peth0 and the virtual eth0 are bridged to xenbr0 bridge. Run 'brctl show' and check it out. This way you can share the physical NIC with other guests, AND you get a dedicated interface for dom0, so you can filter/firewall only the traffic destinated to dom0, leaving the traffic of other guests without firewalling. -- Pasi > > > Kevin > > > > From: [email protected] > [mailto:[email protected]] On Behalf Of Zoran Popovic > Sent: Monday, October 12, 2009 5:26 AM > To: Red Hat Enterprise Linux 5 (Tikanga) discussion mailing-list > Subject: Re: [rhelv5-list] expected network throughput on RHEL Dom0 / PV > DomU > > > > Ok, I have finally found time and tested same machine under non-xen kernel > - it behaves the same. I have noticed only that ethtool works fine on the > non-xen kernel, while on xenified kernel it doesn't give much (only Link > detected: yes). I was using FTP (30MB/s) and SMBCLIENT (18MB/s) as a test, > but that is maybe not a good way to do it. My next question would be: how > to test network load in general ? Any hint is welcome, > Zoran. > > 2009/9/7 Zavodsky, Daniel (GE Capital) <[1][email protected]> > > Hello, > > From my experience, network is maybe 5-15% slower on a PV DomU than on > physical hardware on a gigabit ethernet interface (fully loaded). High > network traffic in DomU eats CPU in Dom0, therefore especially for smaller > message sizes (packets) the throughput is CPU-limited. There must be > something terribly wrong if you get transfer speed of only several kB/s. I > have not tried RHEL 5.4 yet, but up to 5.3 it had worked flawlessly. > > > > Regards, > > Daniel > > > > -------------------------------------------------------------------------- > > From: [2][email protected] > [mailto:[3][email protected]] On Behalf Of Zoran Popovic > Sent: Thursday, September 03, 2009 7:25 PM > To: [4][email protected]; > [5][email protected]; Red Hat Enterprise Linux 5 > (Tikanga) discussion mailing-list > Subject: [rhelv5-list] expected network throughput on RHEL Dom0 / PV DomU > > I use Red Hat 5.3 Dom0 (kernel 2.6.18-128.4.1.el5xen, xen 3.1, using > default xenbridge0 configuration) and Red Hat 5.4 PV DomU (kernel > 2.6.18-164.el5xen, xennet module for eth0), on a HP BL870c (Itanium blade) > with gigabit network adapter (intel, probably). > What is the expected throughput on Dom0 and DomU using 1 network card in > such case (roughly, at least, and the ratio) ? > I made few basic tests with smbclient and ftp download and I am getting > around 18kb/s on Dom0 and 8kb/s on DomU, and I am suspicious about that. > What can be done to improve the throughput on both ? > > Zoran Popovic. > > _______________________________________________ > rhelv5-list mailing list > [6][email protected] > [7]https://www.redhat.com/mailman/listinfo/rhelv5-list > > > > References > > Visible links > 1. mailto:[email protected] > 2. mailto:[email protected] > 3. mailto:[email protected] > 4. mailto:[email protected] > 5. mailto:[email protected] > 6. mailto:[email protected] > 7. https://www.redhat.com/mailman/listinfo/rhelv5-list > _______________________________________________ > rhelv5-list mailing list > [email protected] > https://www.redhat.com/mailman/listinfo/rhelv5-list _______________________________________________ rhelv5-list mailing list [email protected] https://www.redhat.com/mailman/listinfo/rhelv5-list
