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: [email protected] [mailto:[email protected]] On
Behalf Of Zoran Popović
Sent: Thursday, September 03, 2009 7:25 PM
To: [email protected]; [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.
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