This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


Re: [Xen-devel] Xen cluster n/w performance (again!)

To: Ian Pratt <Ian.Pratt@xxxxxxxxxxxx>
Subject: Re: [Xen-devel] Xen cluster n/w performance (again!)
From: David Becker <becker@xxxxxxxxxxx>
Date: Tue, 30 Nov 2004 16:09:43 -0500
Cc: Keir Fraser <keir.fraser@xxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxxx
Delivery-date: Tue, 30 Nov 2004 21:12:18 +0000
Envelope-to: xen+James.Bulpin@xxxxxxxxxxxx
In-reply-to: <E1CWiw8-0005a7-00@xxxxxxxxxxxxxxxxx>
List-archive: <http://sourceforge.net/mailarchive/forum.php?forum=xen-devel>
List-help: <mailto:xen-devel-request@lists.sourceforge.net?subject=help>
List-id: List for Xen developers <xen-devel.lists.sourceforge.net>
List-post: <mailto:xen-devel@lists.sourceforge.net>
List-subscribe: <https://lists.sourceforge.net/lists/listinfo/xen-devel>, <mailto:xen-devel-request@lists.sourceforge.net?subject=subscribe>
List-unsubscribe: <https://lists.sourceforge.net/lists/listinfo/xen-devel>, <mailto:xen-devel-request@lists.sourceforge.net?subject=unsubscribe>
References: <1b0b4557041123133226ff88@xxxxxxxxxxxxxx> <E1CWiw8-0005a7-00@xxxxxxxxxxxxxxxxx>
Sender: xen-devel-admin@xxxxxxxxxxxxxxxxxxxxx
User-agent: Mutt/1.5.6+20040722i
" Is anyone else still seeing network performance anomalies? 

I still cannot get over 500Mbps into xenU with any hardware that I have.
This holds using kernels I build, or using kernel binaries from
the 2.0.1 tarball.

I tried tuning a e1000 driver, which greatly reduced the interrupt count,
but had no effect on bandwidth.

I can get 600 to 750 Mbps into domain-0 from a stock linux host. 
That rate then drops to around 500 after starting the etherbridge.
Running top on Domain-0 claims the domain is over 60% idle.

This is with e1000 and bcm5703 NICs on IBM x335, Dell 1650 and
other platforms, and a variety of CPU clock speeds.
Running iperf under stock linux 2.4.25 gets 940Mbps between any of them.

SF email is sponsored by - The IT Product Guide
Read honest & candid reviews on hundreds of IT Products from real users.
Discover which products truly live up to the hype. Start reading now. 
Xen-devel mailing list