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[209.85.208.173]) by smtp.gmail.com with ESMTPSA id v9sm1284058lfd.195.2021.03.27.13.02.55 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 27 Mar 2021 13:02:55 -0700 (PDT) Received: by mail-lj1-f173.google.com with SMTP id 184so11290261ljf.9 for ; Sat, 27 Mar 2021 13:02:55 -0700 (PDT) X-Received: by 2002:a2e:b6c6:: with SMTP id m6mr12646352ljo.411.1616875375067; Sat, 27 Mar 2021 13:02:55 -0700 (PDT) MIME-Version: 1.0 References: <20210313121541.GC16144@zn.tnic> <20210313124919.GD16144@zn.tnic> <20210313132927.GF16144@zn.tnic> In-Reply-To: From: Linus Torvalds Date: Sat, 27 Mar 2021 13:02:39 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH 0/2] x86: Remove ideal_nops[] To: Sedat Dilek Cc: Peter Zijlstra , Borislav Petkov , "the arch/x86 maintainers" , Steven Rostedt , Peter Anvin , Linux Kernel Mailing List , linux-toolchains@vger.kernel.org, Josh Poimboeuf , Alexei Starovoitov , Masami Hiramatsu Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Mar 27, 2021 at 5:08 AM Sedat Dilek 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