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Re: [Xen-users] Very slow domU network performance

To: Winston Chang <winston@xxxxxxxxxx>
Subject: Re: [Xen-users] Very slow domU network performance
From: "Stephen C. Tweedie" <sct@xxxxxxxxxx>
Date: Tue, 04 Apr 2006 13:59:47 -0400
Cc: xen-users <xen-users@xxxxxxxxxxxxxxxxxxx>
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Hi,

On Tue, 2006-04-04 at 03:26 -0400, Winston Chang wrote:


> The packet loss is as follows:
> domU --> domU  0% (using 127.0.0.1)
> domU --> domU  0% (using domU eth0 IP address)
> dom0 --> domU  ~100% (only 7 of 38464 made it!)

Yow.  

There have been a number of weird checksum problems identified in the
past with Xen's networking; a checkin was just made a day or two ago
which cleans up the checksum handling in a way which may well help here.
We'll have to see whether an updated dom0/domU kernel improves things
much.

--Stephen



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