Re: [Xen-devel] Strange error in domU after dom0 update

[Andreas Florath <xen@xxxxxxxxxxxx>]

Hello!

Thanks for your hint - but it does not change anything for my problem  
switching this on or off.
Spend some more time on investigations: My current assumption is, that  
there is some problem with the network driver (which would explain the  
iSCSI timeout errors).
My test-setup: xen-unstable, dom0 with 2.6.31.4 pvops kernel and one  
domU running Debian Lenny (based on 2.6.26). In the domU a 'nuttcp -S'  
is running.
Output from a dom0 shell:
# nuttcp -T 10 -t 192.168.84.31 ; date ; nuttcp -T 10 -r 192.168.84.31 ; date
 1344.3750 MB /  10.06 sec = 1120.9618 Mbps 1 %TX 17 %RX
Fri Oct 23 13:00:40 CEST 2009
^C
*** transfer interrupted ***
^C
Fri Oct 23 13:02:52 CEST 2009

The first run transfers data from the dom0 to the domU - which works.   
The other way (transferring data from domU to dom0) never stops (I  
pressed Ctrl-C after about two minutes).
[It's getting ever more curious: when I run the '-r' version with a  
'strace' it runs fine - with a speed about 400Mbps.  So when I have a  
closer look at the problem, the problem vanishes - looks a bit like  
Schrödinger's cat ;-).]
I run another test with sftp transferring data from domU to dom0 -  
which gives me (when I'm lucky) about 20kB/s - with a lot 'stalled' in  
between.
Were there some changes in the backend network device which could  
explain this behavior (e.g. rate limiting, additional features, ...)?
Kind regards - Andreas


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