Re: [Xen-devel] network hang trigger

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

I can't reproduce this. e.g.,
 [root@druid-0 root]# ping -s 2473 128.232.39.40
 PING 128.232.39.40 (128.232.39.40) 2473(2501) bytes of data.
 2481 bytes from 128.232.39.40: icmp_seq=0 ttl=64 time=0.074 ms
 2481 bytes from 128.232.39.40: icmp_seq=1 ttl=64 time=0.057 ms
 2481 bytes from 128.232.39.40: icmp_seq=2 ttl=64 time=0.055 ms
 2481 bytes from 128.232.39.40: icmp_seq=3 ttl=64 time=0.057 ms

Both domains have 256MB memory. MTU for both is 1500.

 -- Keir

> 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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 -=- MIME -=- 
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 =3D 1501 byte packet)

I'll do more testing tomorrow.

thanks

James


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