[Xen-users] (Network) unstability :-(( (Modified by Wilmer van der Gaast)

[Wilmer van der Gaast <wilmer@xxxxxxxxx>]

Hello,

I'm running Xen for a while already by now, and usually it works very 
well, I'm really impressed. But there are problems too. :-(
From time to time (it used to happen once in a month, sometimes twice, 
but now it happened twice in one hour) the network stack seems to 
break. I can reach the dom0 host perfectly from outside, but it can't 
communicate with the domus anymore. (Not over IP, at least, xm console 
still works.)
I tried to shut down the domus properly (using poweroff, as usual), but 
it doesn't seem to work very well for two of the machines. They shut 
down, and IIRC previous time xm console also exits properly (didn't 
check this time since I now used xm destroy), however, in xentop I 
still see this:
xentop - 15:58:54   Xen 3.0.1
3 domains: 1 running, 1 blocked, 0 paused, 0 crashed, 1 dying, 0 
shutdown
Mem: 458296k total, 228864k used, 229432k free    CPUs: 2 @ 548MHz
      NAME  STATE   CPU(sec) CPU(%)     MEM(k) MEM(%)  MAXMEM(k) 
MAXMEM(%) VCPUS NETS NETTX(k) NETRX(k) SSID
           d-----         69    0.0         60    0.0      98304      
21.4     1    1     2295     1910    0
           d-b---         28    0.0        176    0.0      65536      
14.3     1    1      934      247    0
  Domain-0 -----r        138    0.8     209948   45.8   no limit       
n/a     2    8        0        0    0
I can reboot now (I'm 200km away from the machine right now), and it 
will work, but it takes about ten minutes first to shut down everything 
(it hangs for a while when Xen wants to save the machine states) and 
finally restart.
So anyway, I'm afraid this isn't really useful information. Things I 
can add: It's a dual-processor (P3) machine, so maybe it's an SMP 
issue? Or maybe it's not very reliable on P3 (Katmai) hardware? Would 
upgrading 3.0.2 be a likely solution to this problem? Because this is 
really too annoying, I'm not used to having to reboot my server more 
than once a year. :-(
Maybe the zombie files will contain useful information for debugging?

[update: I tried to post this last Friday but I wasn't subscribed. 
Upgraded to 3.0.2 yesterday but the problem is still there! :-( It's 
especially strange that it shows up so often now, while it previously 
ran without any problems for a couple of weeks already.]

Greetings,

Wilmer van der Gaast.

--
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