In the meantime i switched back to the normal clocksource.
But i just might have found the something interesting..
This morning, i wanted to check my mails ( which run in a domU ). I noticed i
couldn't get to it, "Unable to connect", as usual.. But i had cacti open, which
could read snmp from the server just fine.
I logged in through SSH, and noticed that the date was set to "Fri Dec 22
22:49:54 CET 2226", and not going forward anymore. The clock had stopped.
In the meantime, /var/log/messages was spewing messages like this:
[134918.952935] clocksource/0: Time went backwards: delta=-6917269600674797899
shadow=134918109266738 offset=843667158
[134923.954592] printk: 1157408 messages suppressed.
[134923.954606] clocksource/0: Time went backwards: delta=-6917269595673126078
shadow=134923109294656 offset=845310074
[134928.952308] printk: 1154382 messages suppressed.
[134928.952323] clocksource/0: Time went backwards: delta=-6917269590675409336
shadow=134928109321066 offset=842999953
I decided to change something to see if it works, so i did:
cat /sys/devices/system/clocksource/clocksource0/current_clocksource, which
showed "xen" as usual.
I then did
echo "jiffies" >
/sys/devices/system/clocksource/clocksource0/current_clocksource, which
instantly made my clock run again, and stalled programs revived. I saw my
webmail ( which was still hanging all the time ) spring to life, along with my
previously entered reboot command..
Does this narrow down the search to the solution?
Kind regards,
Bart
----- Original Message -----
From: "Bart Verwilst" <lists@xxxxxxxxxxx>
To: "Samuel Thibault" <samuel.thibault@xxxxxxxxxxxx>
Cc: Xen-users@xxxxxxxxxxxxxxxxxxx
Sent: Thursday, October 11, 2007 3:55:28 PM (GMT+0100) Europe/Berlin
Subject: Re: [Xen-users] clocksource/0: Time went backwards
Another thing i just tried is this:
# cat /sys/devices/system/clocksource/clocksource0/current_clocksource
xen
# cat /sys/devices/system/clocksource/clocksource0/available_clocksource
xen jiffies
# echo jiffies >
/sys/devices/system/clocksource/clocksource0/current_clocksource
In dmesg:
[57990.836097] Time: jiffies clocksource has been installed.
Do you think this might work? Will it break something else? Is this a good idea?
Thanks!
Bart Verwilst
----- Original Message -----
From: "Samuel Thibault" <samuel.thibault@xxxxxxxxxxxx>
To: "Bart Verwilst" <lists@xxxxxxxxxxx>
Cc: Xen-users@xxxxxxxxxxxxxxxxxxx
Sent: Thursday, October 11, 2007 3:19:37 PM (GMT+0100) Europe/Berlin
Subject: Re: [Xen-users] clocksource/0: Time went backwards
Bart Verwilst, le Thu 11 Oct 2007 15:12:19 +0200, a écrit :
> Oh.. i was hoping for some simple sysctl tweak or easy patch :)
> Bummer :(
Oh, actually, the problem you're getting might be related to CPU
frequency changes, try to disable that as well.
Samuel
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