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Re: [Xen-devel] Problems booting latest xen pv-ops linux kernel

To: Fasiha Ashraf <feehapk@xxxxxxxxxxx>
Subject: Re: [Xen-devel] Problems booting latest xen pv-ops linux kernel
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Thu, 19 Nov 2009 12:21:15 +0200
Cc: "Fajar A." <fajar@xxxxxxxxx>, Xen Developers List <xen-devel@xxxxxxxxxxxxxxxxxxx>
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On Thu, Nov 19, 2009 at 03:46:54PM +0530, Fasiha Ashraf wrote:
>    Hi all
>    I am using xen-3.4.1 with PV OS kernel in FC11. When ever I try
>    using a guest as web server to fetch its data from different nodes I dont
>    experience enough speed even using 1G link on both sides. After running
>    different bench marks I have come to know that while using guest as a
>    sender on 1G link throughput goes down.
>     #wget
>    --2009-11-19 15:17:17--
>    Connecting to connected.
>    HTTP request sent, awaiting response... 200 OK
>    Length: 1073739776 (1024M) [text/plain]
>    Saving to: `VTS_04_1.VOB'
>     0% [                                       ] 432,670     14.7K/s  eta 13h
>    51m ^C

That sounds like you have problems with some network offloading

Have you tried for example this in the domU:
ethtool -K eth0 tx off

Does that help? If it doesn't, try playing with the other offloading
settings.. you can check them with "ethtool -k eth0".

Do you have errors in the dom0 dmesg? 

-- Pasi

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