RE: [Xen-devel] [timer/ticks related] dom0 hang during boot on large 1TB system

[Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>]

> So I don't know what
> scrubbing would be going on during dom0's boot-time 
> calibrations, on any
> version of Xen, actually.

Wasn't the async page scrubbing removed post 3.4.0?
(I think Mukesh's bug was seen on 3.4.0.)  I see
c/s 19886 in July 2009 is "Remove page-scrub lists
and async scrubbing"... if that patch were not
applied, would Mukesh's observed bug make more sense?

Thanks,
Dan

> -----Original Message-----
> From: Keir Fraser [mailto:keir.fraser@xxxxxxxxxxxxx]
> Sent: Friday, December 18, 2009 2:14 AM
> To: Jan Beulich
> Cc: Xen-devel@xxxxxxxxxxxxxxxxxxx; Dan Magenheimer; Kurt 
> Hackel; Mukesh
> Rathor
> Subject: Re: [Xen-devel] [timer/ticks related] dom0 hang 
> during boot on
> large 1TB system
> 
> 
> On 18/12/2009 08:42, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote:
> 
> >> This isn't really Xen time code, but unchanged Linux time 
> code. I don't know
> >> which tree you quoted the code from -- 2.6.18 has similar 
> but not identical.
> >> Anyway, I suggest try using the jiffy-comparison macros from
> >> <linux/jiffies.h>: time_before(), time_after(), etc. These 
> are designed to
> >> work even when jiffies wraps. Feel free to send patch(es) 
> for that, if you
> >> test that out and it works okay.
> > 
> > But regardless of that - shouldn't the page scrubbing really be a
> > background operation these days, and as such be (relatively)
> > performance neutral to the booting of Dom0?
> 
> We synchronously scrub free memory before starting dom0, and then
> subsequently scrub memory only for dying domains. So I don't know what
> scrubbing would be going on during dom0's boot-time 
> calibrations, on any
> version of Xen, actually.
> 
>  -- Keir
> 
> 
>

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