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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: Tue, 13 Oct 2009 01:05:00 -0700
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> Fajar,
>    Are you sure about your DomU to DomU speeds? What methodology did you use
> to test this?
> I've done extensive testing in this area and I've never seen any numbers
> that can come near that with or without
> a pv_ops kernel.

I remembered seeing that much throughput on one of my tests, but I
forgot which one. I'll look into it later.

# iperf -c domU1 -r
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
Client connecting to domU1, TCP port 5001
TCP window size: 85.3 KByte (default)
[  5] local domU2 port 14092 connected with domU1 port 5001
[ ID] Interval       Transfer     Bandwidth
[  5]  0.0-10.0 sec  2.00 GBytes  1.72 Gbits/sec
[  4] local domU2 port 5001 connected with domU1 port 1753
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-10.0 sec  1.57 GBytes  1.35 Gbits/sec

This is on a 2.4GHz Opteron 2378. Since domU <-> domU transfer are
mostly CPU-bound, faster CPUs should yield higher performance.


Thanks for the numbers I reran iperf tests and this is what I got on xen 3.4.1. This is on an 8 core Intel system with 16GB ram.

DomU to DomU - 2.0 Gbits/sec
DomU to Dom0 - 3.46 Gbit/sec
Dom0 to DomU - 346 Mbits/sec

These are similar ratios that I got before but because this system is about 3x faster than the old system the numbers are bigger. Fajar, if you get time could you see if you see something similar on your system?

Grant McWilliams
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