Re: [Xen-devel] slow xenU domains

[David Becker <becker@xxxxxxxxxxx>]

" Are you logging in via ssh or the virtual console? If the latter there

I am seeing the interactivity 'pauses' on both ssh connections and the
virtual console.  THe pause lasts from 5 seconds (with a fair bit
of variance).

The 'xm dmesg' command seems to only show the first 16KB of xen messages.  Is
there a way to clear the buffer? Or have stow the last 16KB of logs?

I looked back through the various logs and did find a series of Timer messages
in the xen0 syslog file from late Saturday evening.   xen0 is running ntpd.
This is build from Oct 6.

Oct  9 23:10:09 rack257-xen -- MARK --
Oct  9 23:10:17 rack257-xen kernel: Timer ISR: Time went backwards: -9992000
Oct  9 23:10:17 rack257-xen kernel: Timer ISR: Time went backwards: -9903000
Oct  9 23:10:17 rack257-xen kernel: Timer ISR: Time went backwards: -9874000
Oct  9 23:10:17 rack257-xen kernel: Timer ISR: Time went backwards: -9846000
Oct  9 23:10:17 rack257-xen kernel: Timer ISR: Time went backwards: -9818000
Oct  9 23:10:17 rack257-xen kernel: Timer ISR: Time went backwards: -9790000
[..256 lines removed..]
Oct  9 23:10:17 rack257-xen kernel: Timer ISR: Time went backwards: -1007000
Oct  9 23:10:17 rack257-xen kernel: Timer ISR: Time went backwards: -979000
Oct  9 23:10:17 rack257-xen kernel: Timer ISR: Time went backwards: -952000
Oct  9 23:10:17 rack257-xen kernel: Timer ISR: Time went backwards: -924000
Oct  9 23:30:11 rack257-xen -- MARK --
Oct  9 23:50:14 rack257-xen -- MARK --


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