Re: [Xen-users] ping in hvm domain not working correctly

[Martin Goldstone <m.j.goldstone@xxxxxxxxxxxxxxx>]

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I'm guessing your using more than 1 VCPU in your HVM domains?  I
encountered the same problem.  I'm not entirely sure what causes the
problem (it may have something to do with timing figures from different
VCPUs), but I'm not experiencing any problems caused by this, just the
inconvenience of an odd time.  The ICMP packets are still being
delivered properly.  Sadly, I've not been able to find a solution, aside
from using only 1 VCPU.

Of course if you are using only 1 VCPU, then this may not be the cause
of your problem.  You could try pinning the VCPU to one physical CPU.
I'm not sure it'll have an effect, but it's worth a try.

Mart

Artur Linhart - Linux communication wrote:
> Hello,
> 
>  
> 
>             I have found a strange behavior if pinging from the HVM domain
> (windows). I reproduced this behavior on different physical machines once in
> DomU Windows 2003 Server Enterprise x64 R2 and once in Windows 2000 advanced
> server (both with latest patches). 
> 
> On both machines the ping response times seem to be generated randomly if
> running the OS instance as DomU (also negative response times are generated
> or received within the ICMP) - this could mean the ICMP packets are not
> delivered correctly by xen to DomU?
> 
>  
> 
> If the remote host cannot beaccessed, then the timeout comes correctlz. Onlz
> in the case the pinged host exists and answers such strange behavior occurs.
> 
>  
> 
>             Does anybody met this problem and what can be the resolution for
> this?
> 
>  
> 
>             With best regards
> 
>  
> 
>                         Archie
> 
>  
> 
> P.S.     Output of ping from the DomU:
> 
>  
> 
> C:\Documents and Settings\Administrator>ping www.linux.org
> 
>  
> 
> Pinging www.linux.org [198.182.196.56] with 32 bytes of data:
> 
>  
> 
> Reply from 198.182.196.56: bytes=32 time=5131ms TTL=51
> 
> Reply from 198.182.196.56: bytes=32 time=-8870ms TTL=51
> 
> Reply from 198.182.196.56: bytes=32 time=9185ms TTL=51
> 
> Reply from 198.182.196.56: bytes=32 time=-8995ms TTL=51
> 
>  
> 
> Ping statistics for 198.182.196.56:
> 
>     Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
> 
> Approximate round trip times in milli-seconds:
> 
>     Minimum = 5131ms, Maximum =  -8870ms, Average =  1073740936ms
> 
>  
> 
> C:\Documents and Settings\Administrator>ping www.linux.org
> 
>  
> 
> Pinging www.linux.org [198.182.196.56] with 32 bytes of data:
> 
>  
> 
> Reply from 198.182.196.56: bytes=32 time=14239ms TTL=51
> 
> Reply from 198.182.196.56: bytes=32 time=-9624ms TTL=51
> 
> Reply from 198.182.196.56: bytes=32 time=-14019ms TTL=51
> 
> Reply from 198.182.196.56: bytes=32 time=-4163ms TTL=51
> 
>  
> 
> Ping statistics for 198.182.196.56:
> 
>     Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
> 
> Approximate round trip times in milli-seconds:
> 
>     Minimum = 14239ms, Maximum =  -4163ms, Average =  1073738432ms
> 
>  
> 
> C:\Documents and Settings\Administrator>ping www.linux.org
> 
>  
> 
> Pinging www.linux.org [198.182.196.56] with 32 bytes of data:
> 
>  
> 
> Reply from 198.182.196.56: bytes=32 time=127ms TTL=51
> 
> Reply from 198.182.196.56: bytes=32 time=11026ms TTL=51
> 
> Reply from 198.182.196.56: bytes=32 time=-10796ms TTL=51
> 
> Reply from 198.182.196.56: bytes=32 time=-15530ms TTL=51
> 
>  
> 
> Ping statistics for 198.182.196.56:
> 
>     Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
> 
> Approximate round trip times in milli-seconds:
> 
>     Minimum = 127ms, Maximum =  -10796ms, Average =  1073738030ms
> 
>  
> 
> C:\Documents and Settings\Administrator>
> 
> 
> 
> ------------------------------------------------------------------------
> 
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> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
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