Hi Marc,
On 9/29/2020 6:50 PM, Marc Zyngier wrote:
On 2020-09-29 10:17, Jingyi Wang wrote:
TWE Delay is an optional feature in ARMv8.6 Extentions. There is a
performance benefit in waiting for a period of time for an event to
arrive before taking the trap as it is common that event will arrive
“quite soon” after executing the WFE instruction.
Define "quite soon". Quantify "performance benefits". Which are the
workloads that actually benefit from this imitation of the x86 PLE?
I was opposed to this when the spec was drafted, and I still am given
that there is zero supporting evidence that it bring any gain over
immediate trapping in an oversubscribed environment (which is the only
case where it matters).
Thanks,
M.
Sure, I will do more performance tests and post the results as soon as
possible.
Thanks,
Jingyi
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