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Re: [Xen-users] Slow outgoing IP traffic with PV drivers

To: Peter Privat <peter.privat@xxxxxxxxxxxx>
Subject: Re: [Xen-users] Slow outgoing IP traffic with PV drivers
From: "Fajar A. Nugraha" <fajar@xxxxxxxxx>
Date: Sun, 1 Mar 2009 02:52:41 +0700
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Delivery-date: Sat, 28 Feb 2009 11:53:19 -0800
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On Sat, Feb 28, 2009 at 11:22 PM, Peter Privat
<peter.privat@xxxxxxxxxxxx> wrote:
> Everything works fine except for the outgoing IP traffic from the domU,
> which seems to be limited to a maximum of around 0.5 mbit. The incoming IP
> traffic works fine. No limitations. If I start the dumU without the PV
> drivers activated, the outgoing IP traffic is working like normal. What am I
> doing wrong here?

The usual recommendations would be "try turning off all checksums,
starting from domU, and then dom0". Others have also say "Ubuntu's
version of Xen sucked, use Debian instead or compile Xen from source".

What I can say is that I'm using several RHEL5.3 dum0, with both RH's
bundled Xen and 3.3.1 from Gitco, both can run Windows domU with PV
drivers just fine, having domU <-> dom0 network performance > 1 Gbps,
and domU <-> outside world close to 100Mbps (mainly because I'm stuck
with 100Mbps Cisco switches).



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