[Xen-users] XENBUS: response ring is not quiescent

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Subject:	[Xen-users] XENBUS: response ring is not quiescent
From:	George Shuklin <george.shuklin@xxxxxxxxx>
Date:	Thu, 07 Oct 2010 15:35:48 +0400
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Good day.

I'm testing live migration (infinitive migration in loop), and I found
sometimes in dmesg of guest machine (2.6.34-xen from SUSE) following
message:

[35993.646804] XENBUS response ring is not quiescent
(00058e85:00058eac): fixing up
[36172.534582] XENBUS response ring is not quiescent
(000675f9:00067620): fixing up
[36228.133259] XENBUS response ring is not quiescent
(0006debf:0006dee6): fixing up
[36410.791326] XENBUS response ring is not quiescent
(00082dd2:00082df9): fixing up
[36572.713538] XENBUS response ring is not quiescent
(0009521c:00095243): fixing up
[36627.399482] XENBUS response ring is not quiescent
(0009bae2:0009bb09): fixing up
[36689.311589] XENBUS response ring is not quiescent
(000a2382:000a23a9): fixing up

AFAIK this message meaning underflow or overflow of ring buffer for
xenstore. But I do not understand consequences for domU... What happens
if ring buffer found over(under)flowed? Some device requests will be
dropped, or some response will be lost? Or dom0/domU kernel have some
kind of queue for those requests?




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[Xen-users] XENBUS: response ring is not quiescent