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[Xen-API] Guests running slowly after restart?

  • To: xen-api@xxxxxxxxxxxxx
  • From: dswartz@xxxxxxxxxx
  • Date: Thu, 14 Mar 2013 13:12:54 -0400
  • Delivery-date: Thu, 14 Mar 2013 17:13:09 +0000
  • Importance: Normal
  • List-id: User and development list for XCP and XAPI <xen-api.lists.xen.org>

Hopefully this is the right list for this, if not my apologies.  Anyway, I
am running XCP 1.6 on a xeon e3-1230 with 24MB RAM.  A handful of guests,
all but one of which are HVM (mainly because of lack of a good tool to PV
such guests) previously running under KVM.  One is windows 7 the others
various flavors of linux.  Anyway, I rebooted one of the guests (Astaro
Security Gateway) after an update.  It started booting, but very very
slowly.  Took almost 10 minutes to get a login prompt, when it usually
takes less than a minutes.  Once I was in, 'w' revealed a load factor of 8
or so, which was increasing as I was watching.  It wasn't (obviously)
paging, and oddly, xencenter claimed the guest was using 3% of 1 vCPU.  I
ended up having to reboot the host at which point all was well.  The same
thing happened about 12 hours later, at which point I tried restarting 2
of the other linux guests and saw the exact same behavior, so it wasn't
just ASG.  Again, a reboot 'fixed' this.  I have limited data points here,
but the problem seems to occur when (after some unknown amount of time), I
try to restart a guest.  Note that prior to restarting them, the guests
seem to be running just fine.  I am relatively new to Xen, so any clues
would be appreciated.  Thanks!

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