Messages in this thread Patch in this message | | | Date | Mon, 4 Jun 2007 14:59:51 -0500 | From | Matt Mackall <> | Subject | Re: Interesting interaction between lguest and CFS |
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On Mon, Jun 04, 2007 at 09:40:38PM +0200, Ingo Molnar wrote: > > * Matt Mackall <mpm@selenic.com> wrote: > > > > ah, so both the shell and the 'competing' CPU hog was running within > > > the same lguest instance? > > > > No. > > > > The CPU hog is running in the host. A single instance of lguest using > > busybox is started in another shell. When it reaches a shell prompt, > > -that- shell is occassionally unresponsive for long stretches. > > so the shell within lguest is affected by the CPU hog outside? Could you > send me the sched-debug stats of the CPU hog and of the lguest host > process as well? (or were those amongst the ones you already sent?)
I sent you the stats for:
- both lguest processes - the bash which started lguest (which I suspect you don't actually want) - the gnome-terminal that lguest was running inside of (keystrokes to the shell in lguest go through that terminal)
The last is probably not very interesting either, as gnome-terminal is a single process with multiple windows and none of the other windows were affected.
So I sent you everything but the stats for the CPU hog.
I suggest you try this yourself - lguest is incredibly easy to get up and running. It's also quite useful: I can test-boot kernels with it in less than a second, or about 10x faster than basic qemu, and 100x faster than a real boot. And as it uses a pty as console, you can do things like pipe it through grep.
You'll need the following tab-damaged patch for rc3-mm1:
--- mm.orig/arch/i386/kernel/sched-clock.c 2007-06-04 12:15:51.000000000 -0500 +++ mm/arch/i386/kernel/sched-clock.c 2007-06-04 12:15:57.000000000 -0500 @@ -133,7 +133,7 @@ static void resync_freq(void *arg) struct sc_data *sc = &__get_cpu_var(sc_data); sc->sync_base = jiffies; - if (!cpu_has_tsc) { + if (!cpu_has_tsc || tsc_disable) { sc->unstable = 1; return; } -- Mathematics is the supreme nostalgia of our time. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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