From owner-freebsd-hackers@freebsd.org Thu Apr 19 18:06:29 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 1077AF91E54 for ; Thu, 19 Apr 2018 18:06:29 +0000 (UTC) (envelope-from 01000162df15f856-1e5d2641-2a72-4250-8d8e-adcd47bc5db4-000000@amazonses.com) Received: from a8-56.smtp-out.amazonses.com (a8-56.smtp-out.amazonses.com [54.240.8.56]) (using TLSv1 with cipher ECDHE-RSA-AES128-SHA (128/128 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id A948D72FB3 for ; Thu, 19 Apr 2018 18:06:28 +0000 (UTC) (envelope-from 01000162df15f856-1e5d2641-2a72-4250-8d8e-adcd47bc5db4-000000@amazonses.com) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple; s=dqtolf56kk3wpt62c3jnwboqvr7iedax; d=tarsnap.com; t=1524161182; h=To:From:Subject:Message-ID:Date:MIME-Version:Content-Type:Content-Transfer-Encoding; bh=rga1IUhNqPf+uMoGlR91ioND8YJrO/vDAiYIWyQgghI=; b=SEJHrYH7Oo0kfjgEmmdoFTLqtYB2bISGWfJka9CUag38/oZL1jInFxDH1H61wyxp CkJBnm+OdG6vyYftlOMjn5eWEnGAvrpEvjN/u7nykdWmGnnhhpIlpNK9zL1HpM/C9Cv eK/ktK7Ao4oKx04fD5YBmEwJUS4dlDciJr75Zwkc= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple; s=ug7nbtf4gccmlpwj322ax3p6ow6yfsug; d=amazonses.com; t=1524161182; h=To:From:Subject:Message-ID:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:Feedback-ID; bh=rga1IUhNqPf+uMoGlR91ioND8YJrO/vDAiYIWyQgghI=; b=K8YKdSWDz00EWfMY3Cx0Jns1r4m3tzm1lsb/TC9sDPyQmZ2OoEon31cUz49DG+9i lWu6TjVIVp63Xp6ZD7k52gOEPFKOKwO0LabPjRxpGScoYbRpXFm5zUZsnv5b/ve0tF6 v4dFKEERtCHtjHa2ongxuPuq+AndMOo2+Oq5e5I0= To: freebsd-hackers@freebsd.org From: Colin Percival Subject: RFC: Hiding per-CPU kernel output behind bootverbose Openpgp: preference=signencrypt Autocrypt: addr=cperciva@tarsnap.com; prefer-encrypt=mutual; keydata= xsDhBElrAAcRBACDfDys4ZtK+ErCJ1HAzYeteKpm3OEsvT/49AjUTLihkF79HhIKrCQU+1KC zv7BwHCMLb6hq30As9L7iFKG7n5QFLFC4Te/VcITUnWHMG/c3ViLOfJGvi+9/nOEHaM1dVJY D6tEp5yM1nHmVQpo9932j4KGuGFR0LhOK5IHXOSfGwCgxSFDPdgxe2OEjWxjGgY+oV3EafcD +JROXCTjlcQiG/OguQH4Vks3mhHfFnEppLxTkDuYgHZQiUtpcT9ssH5khgqoTyMar05OUdAj ZIhNbWDh4LgTj+7ZmvLhXT5Zxw8LX9d7T36aTB8XDQSenDqEtinMWOb0TCBBLbsB8EFG1WTT ESbZci9jJS5yhtktuZoY/eM8uXMD/3k4FWFO80VRRkELSp+XSy/VlSQjyi/rhl2nQq/oOA9F oJbDaB0yq9VNhxP+uFBzBWSqeIX0t1ZWLtNfVFr4TRP5hihI5ICrg/0OpqgisKsU2NFe9xyO hyJLYmfD8ebpDJ/9k30C7Iju9pVrwLm1QgS4S2fqJRcR+U4WbjvP7CgSzSVDb2xpbiBQZXJj aXZhbCA8Y3BlcmNpdmFAdGFyc25hcC5jb20+wmEEExECACEFAklrALYCGwMHCwkIBwMCAQQV AggDBBYCAwECHgECF4AACgkQOM7KaQxqam6/igCgn+z2k3V5ggNppmWrZstt1U2lugsAoL7L wS9V9yLtil3oWmHtwpUqYruEzsFNBElrAAcQCAD3ZLMIsP4CIDoJORg+YY0lqLVBgcnF7pFb 4Uy2+KvdWofN+DKH61rZLjgXXkNE9M4EQC1B4lGttBP8IY2gs41y3AUogGdyFbidq99rCBz7 LTsgARHwFxZoaHmXyiZLEU1QZuMqwPZV1mCviRhN5E3rRqYNXVcrnXAAuhBpvNyj/ntHvcDN 2/m+ochiuBYueU4kX3lHya7sOj+mTsndcWmQ9soOUyr8O0r/BG088bMn4qqtUw4dl5/pglXk jbl7uOOPinKf0WVd2r6M0wLPJCD4NPHrCWRLLLAjwfjrtoSRvXxDbXhCdgGBa72+K8eYLzVs hgq7tJOoBWzjVK6XRxR7AAMGB/9Mo3iJ2DxqDecd02KCB5BsFDICbJGhPltU7FwrtbC7djSb XUrwsEVLHi4st4cbdGNCWCrp0BRezXZKohKnNAPFOTK++ZfgeKxrV2sJod+Q9RILF86tQ4XF 7A7Yme5hy92t/WgiU4vc/fWbgP8gV/19f8nunaT2E9NSa70mZFjZNu4iuwThoUUO5CV3Wo0Y UISsnRK8XD1+LR3A2qVyLiFRwh/miC1hgLFCTGCQ3GLxZeZzIpYSlGdQJ0L5lixW5ZQD9r1I 8i/8zhE6qRFAM0upUMI3Gt1Oq2w03DiXrZU0Fu/R8Rm8rlnkQKA+95mRTUq1xL5P5NZIi4gJ Z569OPMFwkkEGBECAAkFAklrAAcCGwwACgkQOM7KaQxqam41igCfbaldnFTu5uAdrnrghESv EI3CAo8AoLkNMks1pThl2BJNRm4CtTK9xZeH Message-ID: <01000162df15f856-1e5d2641-2a72-4250-8d8e-adcd47bc5db4-000000@email.amazonses.com> Date: Thu, 19 Apr 2018 18:06:21 +0000 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-SES-Outgoing: 2018.04.19-54.240.8.56 Feedback-ID: 1.us-east-1.Lv9FVjaNvvR5llaqfLoOVbo2VxOELl7cjN0AOyXnPlk=:AmazonSES X-Mailman-Approved-At: Thu, 19 Apr 2018 20:05:42 +0000 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 18:06:29 -0000 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 forms 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 paranoid