Re: [PATCH v2] KVM: lapic: remove timer spikes on target expectation

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On Mon, Apr 30, 2018 at 10:07:08AM +0800, Wanpeng Li wrote:
2018-04-25 6:06 GMT+08:00 Anthoine Bourgeois
<anthoine.bourgeois@xxxxxxxxxxxxxxx>:
On Tue, Apr 24, 2018 at 10:19:27AM +0200, Paolo Bonzini wrote:
On another way, I saw that target_expiration is sometimes in a future
farer than the next period (I compare target_expiration > now + period
in start_sw_period). Do you think it is a normal thing or
target_expiration should be adjust to avoid a timer miss ?

How you handle this in v4?

I didn't handle this in any version of the patch. It is hard to
reproduce and the jitter was always close to the deadline.
I never proved that this case distort my tests. I continue to dig that
way but it'll be another patch if necessary.

Thank you for your patch on min_timer_period_us.

Anthoine



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