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

>>> Keir Fraser <keir.fraser@xxxxxxxxxxxxx> 11.12.08 10:22 >>>
>On 11/12/2008 08:02, "Atsushi SAKAI" <sakaia@xxxxxxxxxxxxxx> wrote:
>> This patch intends to remove warnings for Time went backwards
>> (negative delta) like follows.
>> ========from Xen BZ 195
>> Timer ISR/0: Time went backwards: delta=-10048465 cpu_delta=9951535
>> shadow=706605145 0: 71640046095
>> ========
>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.


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