linux-kernel - Re: [PATCH v3 0/8] riscv: optimize string functions and add kunit tests

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Message-ID: <20260123101602.111c6210@pumpkin>
Date: Fri, 23 Jan 2026 10:16:02 +0000
From: David Laight <david.laight.linux@...il.com>
To: Feng Jiang <jiangfeng@...inos.cn>
Cc: Andy Shevchenko <andy.shevchenko@...il.com>, Andy Shevchenko
 <andriy.shevchenko@...el.com>, pjw@...nel.org, palmer@...belt.com,
 aou@...s.berkeley.edu, alex@...ti.fr, akpm@...ux-foundation.org,
 kees@...nel.org, andy@...nel.org, ebiggers@...nel.org,
 martin.petersen@...cle.com, ardb@...nel.org, charlie@...osinc.com,
 conor.dooley@...rochip.com, ajones@...tanamicro.com,
 linus.walleij@...aro.org, nathan@...nel.org,
 linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-hardening@...r.kernel.org
Subject: Re: [PATCH v3 0/8] riscv: optimize string functions and add kunit
 tests

On Fri, 23 Jan 2026 11:12:00 +0800
Feng Jiang <jiangfeng@...inos.cn> wrote:

>...
> I am still exploring some of the finer points of these low-level performance
> trade-offs, so your input is very helpful. I will definitely spend some time
> studying this further and experiment with the approaches you mentioned.

You can spend a long time micro-optimising small functions.
I know, I've done it....
Then you need to test on as many cpu variants as you can find.

	David