From: Juergen Gross <jgross@suse.com>
To: johnnyaiai <arafatms@outlook.com>
Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
dave.hansen@linux.intel.com, hpa@zytor.com,
linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org,
johnnyaiai <johnnyaiai@tencent.com>
Subject: Re: [PATCH] locking/paravirt: Fix performance regression on core bonded vCPU
Date: Thu, 3 Nov 2022 14:22:44 +0100 [thread overview]
Message-ID: <eb487a30-7491-1ef3-fb11-4dff342215bc@suse.com> (raw)
In-Reply-To: <MEYP282MB402614DB5A4625255B689F06C3389@MEYP282MB4026.AUSP282.PROD.OUTLOOK.COM>
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On 03.11.22 13:13, johnnyaiai wrote:
> From: johnnyaiai <johnnyaiai@tencent.com>
>
> 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@tencent.com>
That is exactly the purpose of the existing nopvspin parameter.
Juergen
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next prev parent reply other threads:[~2022-11-03 13:22 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-03 12:13 johnnyaiai
2022-11-03 13:22 ` Juergen Gross [this message]
2022-11-03 13:58 ` johnnyaiai
2022-11-03 14:09 ` Juergen Gross
-- strict thread matches above, loose matches on Subject: below --
2022-11-03 12:10 johnnyaiai
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