Re: [PATCH] locking/paravirt: Fix performance regression on core bonded vCPU

[Juergen Gross]

On 03.11.22 13:13, johnnyaiai wrote:
> From: johnnyaiai <johnnyaiai@xxxxxxxxxxx>
>
> virt_spin_lock() is preferred over native qspinlock when
> vCPU is preempted. But brings a lot of regression while
> vCPU is not preempted. Provide a early param 'novirtlock'
> to choose would be better.
>
> will-it-scale/lock2_threads -s 10 -t 64
> baseline    afterpatch
> 559938       2166135
>
> Signed-off-by: johnnyaiai <johnnyaiai@xxxxxxxxxxx>

That is exactly the purpose of the existing nopvspin parameter.


Juergen

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