I am using netperf for network performance measurements. ethtool will not
show you much information from the paravirtualised xennet driver because
everything is done in Dom0.
Regards,
Daniel
________________________________
From: [email protected] [mailto:[email protected]] On
Behalf Of Zoran Popović
Sent: Monday, October 12, 2009 2:26 PM
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) <[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: [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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