linux-kernel - Re: [PATCH v2 00/14] riscv: optimize string functions and add kunit tests

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Message-ID: <CACPK8Xc2inE8=mbPFt+iTtgOqF_1U9m+76014aDaQxVyTYy2UQ@mail.gmail.com>
Date: Thu, 15 Jan 2026 15:13:40 +1030
From: Joel Stanley <joel@....id.au>
To: Feng Jiang <jiangfeng@...inos.cn>
Cc: pjw@...nel.org, palmer@...belt.com, aou@...s.berkeley.edu, alex@...ti.fr, 
	kees@...nel.org, andy@...nel.org, akpm@...ux-foundation.org, 
	ebiggers@...nel.org, martin.petersen@...cle.com, ardb@...nel.org, 
	ajones@...tanamicro.com, conor.dooley@...rochip.com, 
	samuel.holland@...ive.com, linus.walleij@...aro.org, nathan@...nel.org, 
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	linux-hardening@...r.kernel.org, 
	"dfustini@....tenstorrent.com" <dfustini@....tenstorrent.com>, Michael Ellerman <mpe@....tenstorrent.com>
Subject: Re: [PATCH v2 00/14] riscv: optimize string functions and add kunit tests

On Tue, 13 Jan 2026 at 18:58, Feng Jiang <jiangfeng@...inos.cn> wrote:
>
> This series introduces optimized assembly implementations for strnlen,
> strchr, and strrchr on the RISC-V architecture. To support a rigorous
> verification process, the series also significantly expands the
> string_kunit test suite with both functional correctness tests and
> performance benchmarks.

I ran the kunit tests on Ascalon, a RVA23 CPU, in emulation. The arch
optimised version showed significant improvements over the plain
version.

I didn't have time to investigate if the numbers made sense. As Andy
noted, the 'long' benchmark had a much higher ratio improvement than
the short and medium.

Tested-by: Joel Stanley <joel@....id.au>

Cheers,

Joel