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Re: [Xen-users] Xen Performance

To: "Fajar A. Nugraha" <fajar@xxxxxxxxx>
Subject: Re: [Xen-users] Xen Performance
From: Grant McWilliams <grantmasterflash@xxxxxxxxx>
Date: Wed, 14 Oct 2009 00:06:54 -0700
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On Tue, Oct 13, 2009 at 11:18 PM, Fajar A. Nugraha <fajar@xxxxxxxxx> wrote:
On Wed, Oct 14, 2009 at 12:54 AM, Grant McWilliams
<grantmasterflash@xxxxxxxxx> wrote:
> CentOS 5.4? If my time machine worked :-) . I'm already running CentOS 5.3
> with Gitco's Xen 3.4.1.
> Here's another system: CentOS 5.3 Dom0, CentOS 5.3 DomUs on a Dual Core Duo
> Xeon system (2.8ghz)
> DomU to DomU -  1.93 Gbits/sec
> DomU to Dom0 -  2.76 Gbit/sec
> Dom0 to DomU -  193 Mbits/sec

Ah ... so domU <-> domU is working FINE, right? That is similar with
the results I get :

It isn't working fine. I said at the end of my message that the numbers aren't quite right because I didn't post both halves of the bidirectional test. The second half is 1/4 the speed of the first.

Can you post the whole bidirectional test for DomU to DomU like the one below? As soon as I get my Virtual Server back up I'll post full numbers. I didn't realize until the end of the test that I was only recording one direction. The reverse direction numbers are 1/4 the speed. Anyway I'll do more comprehensive testing.

As for dom0 -> domU performance, it is indeed lower, and I'm not sure
why. In my case it's still usable though (about 600-800 Mbps), since I
don't run any service on dom0 that is used by domU. Here's my dom0 <->
domU result.

# iperf -c -r
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
Client connecting to, TCP port 5001
TCP window size: 85.3 KByte (default)
[  5] local port 52890 connected with port 5001
[ ID] Interval       Transfer     Bandwidth
[  5]  0.0-10.0 sec  2.72 GBytes  2.34 Gbits/sec
[  4] local port 5001 connected with port 16809
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-10.0 sec    747 MBytes    627 Mbits/sec -> dom0's virbr0, running RHEL5.4 64bit,
kernel-xen-2.6.18-164.2.1.el5, Xen 3.4.1. -> domU, kernel-xen-2.6.18-164.2.1.el5

I'm not sure why your dom0 -> domU is about 3 times slower than mine.
Perhaps newer kernel version matters.



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