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Re: [Xen-devel] [PATCH][RFC] remove PV/x86 warnings (timewentbackwards)

>>> Keir Fraser <keir.fraser@xxxxxxxxxxxxx> 11.12.08 12:03 >>>
>On 11/12/2008 10:31, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote:
>>> That might be considered skirting around the problem. Are users still seeing
>>> this with xen 3.3 and xen unstable?
>> Unfortunately yes, but rather seldom these days. We just got a fresh
>> report about a larger IBM system suffering from it - while the initial report
>> they sent had hundreds of milliseconds in them, the most up-to-date
>> one we have shows that it's just a few milliseconds above the -10ms
>> boundary. So far I haven't been able to figure what causes this.
>Perhaps we should expand the default acceptable jitter a bit? Still, I'd
>hoped that 10ms would be plenty!

So would I (and really I find 10ms pretty wide already), which is why I
never proposed an adjustment here, despite getting reports about these
messages popping up every once in a while. And then again, it's
configurable on the command line and via sysctl, so if someone really
just wants the messages go away, he can already do that.


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