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RE: Use of newer locking primitives...
- To: Paul Durrant <xadimgnik@xxxxxxxxx>, "win-pv-devel@xxxxxxxxxxxxxxxxxxxx" <win-pv-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Martin Harvey <martin.harvey@xxxxxxxxxx>
- Date: Tue, 30 Aug 2022 18:01:18 +0000
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- Thread-topic: Use of newer locking primitives...
-----Original Message-----
From: Paul Durrant <xadimgnik@xxxxxxxxx>
> Nope. KeStallExecutionProcessor just pauses, it doesn't HLT, not interrupts
> required. It's a spin, so it does a PAUSE.
>
> So directly equivalent to yield then. See
Ouch. Pause is one of the optional vmexit instructions. So you do an entire
vm-exit, when all you wanted to do is sit on your backside for a few
nanoseconds.
>> Right, that could be because something has just dumped (or is still
> dumping) a load of packets on the queue. Whoever has the lock has to drain
> the entire queue...
Yes, isn't that funny? How could we change it?
> Profiling ...
We have iPerf. It seems to work with with ETW, and we have the other profilers
somewhat automated.
MH.
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