Re: [Xen-devel] [PATCH] libxl: Increase device model startup timeout to 1min.

[Dario Faggioli <dario.faggioli@xxxxxxxxxx>]

On Mon, 2015-06-29 at 17:09 +0100, Anthony PERARD wrote:
> On Mon, Jun 29, 2015 at 03:51:57PM +0100, Ian Campbell wrote:
> > On Mon, 2015-06-29 at 15:23 +0100, Anthony PERARD wrote:

> > > OK. What about:
> > 
> > I'm afraid none of that really explains why QEMU taking >10s is
> > reasonable/expected under the circumstances or why 60s is a good choice
> > now.
> > 
> > Nor does it really answer Ian's question in
> > <21901.33163.547929.321814@xxxxxxxxxxxxxxxxxxxxxxxx> I think.
> 
> I only know what happen, not why it happen.
> 
> How could I investigate why qemu is taking so long after an mmap() syscall?
> I guest at that time, it is copying the library into memory.
> 
Is there a lot of CPU / memory contention in Dom0 (assuming that QEMU
runs in dom0 in this case)?

If yes, is it plausible for that to be the cause?

If yes, can we show, or monitor, or trace it somehow? That would be a
first step toward trying to figure out what specific characteristic of
the contended scenario causes the issue...

Dario

-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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