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Re: [Xen-devel] Timer ISR/0: Time went backwards

To: Ted Kaczmarek <tedkaz@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Timer ISR/0: Time went backwards
From: David F Barrera <dfbp@xxxxxxxxxx>
Date: Fri, 07 Oct 2005 09:14:57 -0500
Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
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This is a know issue:

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=195

Ted Kaczmarek wrote:

On Fri, 2005-10-07 at 10:03 -0400, Ted Kaczmarek wrote:
###############################################
changeset:   7234:bd37123974b2
Centos 4.1 dom0, Tyan 2462 SMP, 8k kernel stack
###############################################

7 UP guests, have 1 very fat guest(1200 megs, running tomcat4,
postgresql, and opennms unstable) domain1, issuing xm save domain1;xm restore domain1

saw these log messages.

XEN) (file=grant_table.c, line=940) Grant unref rd(13) ld(0) frm(1a8cd)
flgs(1).
(XEN) (file=grant_table.c, line=940) Grant unref rd(13) ld(0) frm(1a614)
flgs(1).


DomU's exceeding 24 hours of uptime, other than issues related to load
on dom0 things are behaving rather well.

Where can a user obtain docs on the grant tables by the way?
Is the source the only present place?


Regards
Ted


_______________________________________________
Within seconds of setting this a total melt down :-(

A couple hundred or so of these on the console.

Timer ISR/0: Time went backwards: delta=-9101039 cpu_delta=10898961
shadow=89150287265250 off=9333682407 processed8 0: 89159610048608
1: 89159630000000
Timer ISR/0: Time went backwards: delta=-9144937 cpu_delta=10855063
shadow=89150287265250 off=9343638515 processed8 0: 89159620048608
1: 89159640000000
Timer ISR/0: Time went backwards: delta=-8707693 cpu_delta=11292307
shadow=89150287265250 off=9354075736 processed8 0: 89159630048608
1: 89159650000000


You guys putting any gremlins in this code :-)

Regards,
Ted


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