From: Will Deacon <will@kernel.org>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: Liu Song <liusong@linux.alibaba.com>,
james.morse@arm.com, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] arm64: spectre: increase parameters that can be used to turn off bhb mitigation individually
Date: Wed, 7 Sep 2022 17:29:53 +0100 [thread overview]
Message-ID: <20220907162952.GC30558@willie-the-truck> (raw)
In-Reply-To: <YxiqsXjQQGe0dNuA@arm.com>
On Wed, Sep 07, 2022 at 03:29:05PM +0100, Catalin Marinas wrote:
> On Fri, Aug 26, 2022 at 07:40:50PM +0800, Liu Song wrote:
> > From: Liu Song <liusong@linux.alibaba.com>
> >
> > In our environment, it was found that the mitigation BHB has a great
> > impact on the benchmark performance. For example, in the lmbench test,
> > the "process fork && exit" test performance drops by 20%.
> > So it is necessary to have the ability to turn off the mitigation
> > individually through cmdline, thus avoiding having to compile the
> > kernel by adjusting the config.
> >
> > Signed-off-by: Liu Song <liusong@linux.alibaba.com>
>
> If people want to disable this mitigation and know what they are doing,
> I have no objection:
>
> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Thanks!
> (I guess that's more like 6.1 material)
Yup, agreed. I take it you'll pick it up, then?
Will
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next prev parent reply other threads:[~2022-09-07 16:31 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-26 11:40 [PATCH v2] arm64: spectre: increase parameters that can be used to turn off bhb mitigation individually Liu Song
2022-09-07 14:29 ` Catalin Marinas
2022-09-07 16:29 ` Will Deacon [this message]
2022-09-09 18:08 ` Catalin Marinas
-- strict thread matches above, loose matches on Subject: below --
2022-08-26 11:08 [PATCH] " Liu Song
2022-08-26 12:44 ` [PATCH v2] " Liu Song
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