linux-kernel - Re: x86 copy performance regression

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Message-ID: <CAHk-=whtDupvWtj_ow11wU4_u=KvifTqno=5mW1VofyehjdVRA@mail.gmail.com>
Date:   Fri, 26 May 2023 10:17:03 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: x86 copy performance regression

On Fri, May 26, 2023 at 10:00 AM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> Let me go look at it some more. I *really* didn't want to make the
> code worse for ERMS

Oh well. I'll think about it some more in the hope that I can come up
with something clever that doesn't make objtool hate me, but in the
meantime let me just give you the "not clever" patch.

It generates an annoying six-byte jump when the small 2-byte one would
work just fine, but I guess only my pride is wounded.

              Linus

View attachment "patch.diff" of type "text/x-patch" (877 bytes)