Re: [RFC] time: xtime_lock is held too long
From: Andi Kleen
Date: Fri May 06 2011 - 13:17:09 EST
> Unless I am very mistaken, it cannot explain my original report of up to
> 24.000 instructions waiting in ktime_get()
Yes it's a different problem. Sorry for hijacking your thread.
>
> BTW, how many consecutive prefetch() a cpu can 'store/execute' before
> throwing away hints ?
It depends on the CPU. Older ones had a small number only. On the
newer ones it tends to be limited by the various queues to memory,
which are a shared resource (so it also depends on what the other
threads/cores are doing)
I normally assume as a rule of thumb < 50
-Andi
--
ak@xxxxxxxxxxxxxxx -- Speaking for myself only.
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