linux-kernel - Re: [PATCH 0/2] x86: Remove ideal

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Message-ID: <CAHk-=whXAvCnjCBj=p4-xvEojQ1iy=dA9VjWtAhMwG4MLK_6jw@mail.gmail.com>
Date:   Sat, 27 Mar 2021 13:02:39 -0700
From:   Linus Torvalds <torvalds@...uxfoundation.org>
To:     Sedat Dilek <sedat.dilek@...il.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Peter Anvin <hpa@...or.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-toolchains@...r.kernel.org,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH 0/2] x86: Remove ideal_nops[]

On Sat, Mar 27, 2021 at 5:08 AM Sedat Dilek <sedat.dilek@...il.com> wrote:
>
> debian-5.10.19 as host-kernel:
> 11655.755564957 seconds time elapsed
>
> dileks-5.12-rc3 plus x86-nops as host-kernel:
> 11941.439350080 seconds time elapsed

That's 2.5% - a huge difference. Particularly since kernel build times
shouldn't even be that kernel-intensive.

I think there's something else going on than the nops. Same config?
There are likely many other differences between 5.10.19 and 5.12-rc3.

So can you check just plain 5.12-rc3 and then 5.12-rc3 plus x86-nops,
with otherwise identical configuration?

               Linus