[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] RE: [PATCH] clocksource=tsc
Nope, its not ntpd. Everything seemed fine for at least 15-20 minutes, then I went away for awhile and when I checked back an hour later, same weird symptoms as before. I also tried running with nosmp on the xen boot line (and confirmed that only one processor was started). Same results... after about an hour. So it doesn't appear to be a result of cross-CPU time issues. > From: Dan Magenheimer [mailto:dan.magenheimer@xxxxxxxxxx] > > I'm thinking the problem may only occur when dom0 is > running ntpd. Maybe "setting" the platform time only > changes one CPU, or sets the platform time differently > than system time? > > > -----Original Message----- > > From: Keir Fraser [mailto:keir.fraser@xxxxxxxxxxxxx] > > Sent: Wednesday, July 16, 2008 6:50 AM > > To: dan.magenheimer@xxxxxxxxxx; Xen-Devel (E-mail) > > Cc: Dave Winchell > > Subject: Re: [PATCH] clocksource=tsc > > > > > > That's a weird set of symptoms. Perhaps dom0's sense of > system time is > > diverging from Xen's? I don't see that CPUs can diverge, if > > their TSCs are > > in sync, since we shouldn't be dynamically modifying the > > per-CPU timestamps > > or scale factors. > > > > -- Keir > > > > On 16/7/08 13:43, "Dan Magenheimer" > > <dan.magenheimer@xxxxxxxxxx> wrote: > > > > > Well now I have to take that back. It DOESN'T work yet. > > > I think I am experiencing "Weirdness can happen..." > > > when booting with clocksource=tsc... I was away from > > > the machine overnight but the symptoms I've seen before > > > are that the system becomes less snappy and eventually > > > grinds to a near-halt. > > > > > > Oddly, I can login most of the way on the console > > > and launch new xterm's in my VNC display, but I never > > > get a prompt, and I can't interrupt a process I left > > > running overnight in another xterm. The time display > > > in gnome seems to have frozen about an hour after > > > I booted. Pinging the machine works but ssh'ing to > > > it doesn't ("Connection closed") _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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