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.
Kevin From: rhelv5-list-boun...@redhat.com [mailto:rhelv5-list-boun...@redhat.com] 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) <daniel.zavod...@ge.com> 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: rhelv5-list-boun...@redhat.com [mailto:rhelv5-list-boun...@redhat.com] On Behalf Of Zoran Popović Sent: Thursday, September 03, 2009 7:25 PM To: xen-us...@lists.xensource.com; xen-ia64-de...@lists.xensource.com; 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 rhelv5-list@redhat.com https://www.redhat.com/mailman/listinfo/rhelv5-list
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