From nobody Sun Mar 26 18:24:07 2023 X-Original-To: freebsd-hackers@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4Pl48x1HhYz428dQ for ; Sun, 26 Mar 2023 18:24:17 +0000 (UTC) (envelope-from george+freebsd@m5p.com) Received: from mailhost.m5p.com (mailhost.m5p.com [74.104.188.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "m5p.com", Issuer "R3" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 4Pl48w1HnJz3sJp for ; Sun, 26 Mar 2023 18:24:16 +0000 (UTC) (envelope-from george+freebsd@m5p.com) Authentication-Results: mx1.freebsd.org; dkim=none; spf=pass (mx1.freebsd.org: domain of george+freebsd@m5p.com designates 74.104.188.4 as permitted sender) smtp.mailfrom=george+freebsd@m5p.com; dmarc=none Received: from [IPV6:2001:470:1f07:15ff::26] (court.m5p.com [IPv6:2001:470:1f07:15ff:0:0:0:26]) (authenticated bits=0) by mailhost.m5p.com (8.16.1/8.15.2) with ESMTPSA id 32QIO7LZ033075 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NO) for ; Sun, 26 Mar 2023 14:24:12 -0400 (EDT) (envelope-from george+freebsd@m5p.com) Message-ID: Date: Sun, 26 Mar 2023 14:24:07 -0400 List-Id: Technical discussions relating to FreeBSD List-Archive: https://lists.freebsd.org/archives/freebsd-hackers List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-hackers@freebsd.org MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:102.0) Gecko/20100101 Thunderbird/102.4.0 Subject: Re: Periodic rant about SCHED_ULE To: freebsd-hackers@freebsd.org References: Content-Language: en-US From: George Mitchell In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=0.0 required=10.0 tests=HELO_NO_DOMAIN,NICE_REPLY_A autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on mattapan.m5p.com X-Spamd-Result: default: False [-2.85 / 15.00]; NEURAL_HAM_MEDIUM(-1.00)[-0.999]; NEURAL_HAM_LONG(-1.00)[-0.997]; NEURAL_HAM_SHORT(-0.55)[-0.552]; R_SPF_ALLOW(-0.20)[+a]; MIME_GOOD(-0.10)[text/plain]; R_DKIM_NA(0.00)[]; TAGGED_FROM(0.00)[freebsd]; MLMMJ_DEST(0.00)[freebsd-hackers@freebsd.org]; FROM_EQ_ENVFROM(0.00)[]; ASN(0.00)[asn:701, ipnet:74.104.0.0/16, country:US]; MIME_TRACE(0.00)[0:+]; DMARC_NA(0.00)[m5p.com]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; MID_RHS_MATCH_FROM(0.00)[]; ARC_NA(0.00)[]; RCVD_TLS_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; PREVIOUSLY_DELIVERED(0.00)[freebsd-hackers@freebsd.org]; TO_MATCH_ENVRCPT_ALL(0.00)[]; TO_DN_NONE(0.00)[]; RCVD_COUNT_TWO(0.00)[2] X-Rspamd-Queue-Id: 4Pl48w1HnJz3sJp X-Spamd-Bar: -- X-ThisMailContainsUnwantedMimeParts: N On 3/25/23 23:42, Peter wrote: > Quoting George Mitchell : > > On 3/25/23 11:47, Peter wrote: >>> You're welcome. Can I get a success/failure report? >>> >>> >>> [...] >> Thanks for your help. Regretfully, I have to report that the patch >> did not really help in my case (make buildworld while running dnetc). >> But I have belatedly realized that it's a really good idea to use >> make -j12 to build kernels and the world. With 4BSD and dnetc >> running, I can now buildworld in 3512 seconds (down from 20477), and >> with ULE in 14193 seconds (down from 50290). Peter's patch got it >> down to 13755 seconds. > > Thank You for testing. So at least it doesn't make things worse. > Back then 5 years ago when I made that, I think I've seen a few > more strange things in that code, but they didn't bother me immanently > at that point. Probably there is more work to do there... To oversimplify the discussion I've seen so far on this thread: It would be really nice if the schedulers were kernel loadable modules. GSoC project? Whether SCHED_ULE or SCHED_4BSD should be the default scheduler in the GENERIC kernel is a contentious discussion, but perhaps we need to have that discussion. -- George