RE: [Xen-devel] network hang trigger

["James Harper" <JamesH@xxxxxxxxxxxxxxxx>]

Lowering the MTU introduces the problem at a lower packetsize as
expected, so I'd suspect the problem is fragmentation.

I did a test running tcpdumps in both domains, and when I do a ping from
domU to dom0, I see the correct packets on domU, but dom0 only gets the
first fragment then nothing.

James

> -----Original Message-----
> From: xen-devel-admin@xxxxxxxxxxxxxxxxxxxxx [mailto:xen-devel-
> admin@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of James Harper
> Sent: Wednesday, 15 September 2004 17:24
> To: xen-devel@xxxxxxxxxxxxxxxxxxxxx
> Subject: [Xen-devel] network hang trigger
> 
> I have found that simply doing a ping with packetsize > 1500 (maybe
> mtu???) causes the network to hang for a short time. This is from xenU
> and xen0 on the same machine.
> 
> Can someone else _please_ test this? I am able to make the network
hang
> by saying from domU:
> ping -s 1473 <dom0 ip>
> (1473 + 28 byte header = 1501 byte packet)
> 
> I'll do more testing tomorrow.
> 
> thanks
> 
> James
> 
> 
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