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Reply-To: sedat.dilek@gmail.com
From:   Sedat Dilek <sedat.dilek@gmail.com>
Date:   Mon, 15 Mar 2021 18:19:34 +0100
Message-ID: <CA+icZUVOf4T65H2t_q-h_eAN24WOEN-cc8eNubT3GojJrGJ0vA@mail.gmail.com>
Subject: Re: [PATCH 0/2] x86: Remove ideal_nops[]
To:     Borislav Petkov <bp@alien8.de>
Cc:     Peter Zijlstra <peterz@infradead.org>, x86@kernel.org,
        rostedt@goodmis.org, hpa@zytor.com, torvalds@linuxfoundation.org,
        linux-kernel@vger.kernel.org, linux-toolchains@vger.kernel.org,
        jpoimboe@redhat.com, alexei.starovoitov@gmail.com,
        mhiramat@kernel.org
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On Mon, Mar 15, 2021 at 6:15 PM Borislav Petkov <bp@alien8.de> wrote:
>
> On Mon, Mar 15, 2021 at 06:04:41PM +0100, Sedat Dilek wrote:
> > Here some fresh numbers:
>
> Lemme paste my previous reply which still holds true here:
>
> "There's a reason I have -s for silent in the build - printing output
> during the build creates a *lot* of variance. And you have excessive
> printing with V=1 and KBUILD_VERBOSE=1.
>

I have this for diagnostic reasons.
Yes, I can drop V=1 and KBUILD_VERBOSE=1.
This is a good idea for a fast build.

> Also, you need to repeat those workloads a couple of times - one is not
> enough. That's why I have --repeat 5 in there.
>
> Also, you need --pre=/root/bin/pre-build-kernel.sh where that script is:
>
> ---
> #!/bin/bash
> echo $0
>
> make -s clean
> echo 3 > /proc/sys/vm/drop_caches
> ---
>
> so that you can avoid pagecache influence."
>

With my next build I try to apply this.

- Sedat -