From owner-freebsd-hackers@freebsd.org Thu Apr 19 20:48:26 2018 Return-Path: Delivered-To: freebsd-hackers@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 672B9FA10E2 for ; Thu, 19 Apr 2018 20:48:26 +0000 (UTC) (envelope-from steven@multiplay.co.uk) Received: from mail-lf0-x22a.google.com (mail-lf0-x22a.google.com [IPv6:2a00:1450:4010:c07::22a]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id D7C107ACE1 for ; Thu, 19 Apr 2018 20:48:25 +0000 (UTC) (envelope-from steven@multiplay.co.uk) Received: by mail-lf0-x22a.google.com with SMTP id u21-v6so483593lfu.9 for ; Thu, 19 Apr 2018 13:48:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=multiplay-co-uk.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=3rRvX20IRuq2BNaKAgLqMmWyg7JKmLgBtSRgN7a+3N8=; b=FdeypmTJ7U4grYn6Fj3lIu2IcywoszloGFRhBDbfzbqkt6d4HJlnP6IKAbkFO61O6N K9y1d3kdPGM23gpR2T3HN5xpv9LdnEGzlBKecQ7br7WLM6veT9bxD6fYGOatOfmclmEK TP9nFlGkhSxTiZkwW2F6RrOV0pzui3pvhmDw/wKtvIHhKpG3866tREmeoLqb0J3Ldvny XWPNS7Wj5PGEoe9NC4ewIZwoudcNELcxuwMgNloGTWhbvGIO/YiRC2Q3su+3Z902Oolp VqfU+xd22haTeGPeohFc66RP3GdWm1bYeZ7KWmcgnEkW0POBTUP1B/eIDn1jXvLLAPgx I7dw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=3rRvX20IRuq2BNaKAgLqMmWyg7JKmLgBtSRgN7a+3N8=; b=O5rK3PrtrCn+6szz3dDH3GIAXNzLaSvAsyXcc0pwJT9s37ET0naBq0yHtwTIFTObzM r2D42cHrerYrk8hQ4R6rW4ZsnrsDkQfEkBC1e1RAQ8lK4O/RlV/EIil6vTRPlD0k012J yYDJLiLFGGRo5ma4WBVJfNEB3SNPXY1/ApW84cr5UhL3bpbK0yVAnzq1X69HPjCDqgVu SLgUPR76hhwaWH3p+1hj/twNquv8ECC8JvlMBRyqzaDqX9AN8gGkMa0ILXpsCXaPRKqa 4USnLxZU3TSijH1ieZ2MDZx2khdrH+grskuNoF3QXtd8hfoY52WJMBzY+wo7q/C/7GWB Jd8Q== X-Gm-Message-State: ALQs6tC7v1film2HluRfy+aUHR5iFdiF7rUlHRI/il5tALxl0npNKeaN 07W7xJ4mgU9FDBZoj3qzdr7AMiQkg4b3TvJaeTCtd1Y5 X-Google-Smtp-Source: AB8JxZquQywrMifmKQjLCI/NaP+GjfGwM0LrSNWph4HXP3UFzL3Gqrj6xb/rCak5XDV3tm1k34+It+E9cgyZ/Ynvw7k= X-Received: by 2002:a19:c3d0:: with SMTP id t199-v6mr7098lff.127.1524170903668; Thu, 19 Apr 2018 13:48:23 -0700 (PDT) MIME-Version: 1.0 References: <01000162df15f856-1e5d2641-2a72-4250-8d8e-adcd47bc5db4-000000@email.amazonses.com> In-Reply-To: <01000162df15f856-1e5d2641-2a72-4250-8d8e-adcd47bc5db4-000000@email.amazonses.com> From: Steven Hartland Date: Thu, 19 Apr 2018 20:48:13 +0000 Message-ID: Subject: Re: RFC: Hiding per-CPU kernel output behind bootverbose To: Colin Percival Cc: freebsd-hackers@freebsd.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.25 X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 19 Apr 2018 20:48:26 -0000 Sounds good to me, I think we could actually benefit from even quieter modes if I=E2=80=99m honest. On Thu, 19 Apr 2018 at 21:09, Colin Percival wrote: > On large systems (e.g., EC2's x1e.32xlarge instance type, with 128 vCPUs) > the boot time console output contains a large number of lines of the form= s > > SMP: AP CPU #N Launched! > cpuN: on acpi0 > estN: on cpuN > > Having 128 almost-identical lines of output doesn't seem very useful, and > it actually has a nontrivial impact on the time spent booting. > > Does anyone mind if I hide these by default, having them only show up if > boot verbosity is requested? > > -- > Colin Percival > Security Officer Emeritus, FreeBSD | The power to serve > Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoi= d > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org= " >