linux-kernel - Re: [PATCH v2 0/4] Allow default HARDENED

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Message-ID: <202501221701.61D4E17@keescook>
Date: Wed, 22 Jan 2025 17:02:29 -0800
From: Kees Cook <kees@...nel.org>
To: Mel Gorman <mgorman@...hsingularity.net>
Cc: Daniel Micay <danielmicay@...il.com>, Paul Moore <paul@...l-moore.com>,
	linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/4] Allow default HARDENED_USERCOPY to be set at
 compile time

On Wed, Jan 22, 2025 at 05:19:21PM +0000, Mel Gorman wrote:
> on the exact CPU. While the benchmarks are somewhat synthetic, the overhead
> IO-intensive and network-intensive is easily detectable but the root cause
> may not be obvious (e.g. 2-14% overhead for netperf TCP_STREAM running
> over localhost with different ranges depending on the CPU).

I would be curious to see where this overhead is coming from. That seems
extraordinarily high, and makes me think there is something more we
should be fixing. :)

-- 
Kees Cook