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[92.1.116.226]) by smtp.gmail.com with ESMTPSA id s24sm3510732wra.33.2021.07.14.08.47.46 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 14 Jul 2021 08:47:46 -0700 (PDT) Date: Wed, 14 Jul 2021 16:47:45 +0100 To: freebsd-hackers@freebsd.org Subject: Re: Periodic rant about SCHED_ULE Message-ID: <20210714164745.0128ea15@gumby.homeunix.com> In-Reply-To: <20210708101907.0be3a3c2@rimwks.local> References: <13445948-7804-20b4-4ae6-aaac14d11e87@m5p.com> <20210708101907.0be3a3c2@rimwks.local> X-Mailer: Claws Mail 3.17.8 (GTK+ 2.24.33; amd64-portbld-freebsd12.2) 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 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 4GQ22Y36lLz4ZB8 X-Spamd-Bar: + Authentication-Results: mx1.freebsd.org; dkim=pass header.d=googlemail.com header.s=20161025 header.b=bvdSMXyx; dmarc=pass (policy=quarantine) header.from=googlemail.com; spf=pass (mx1.freebsd.org: domain of rwmaillists@googlemail.com designates 2a00:1450:4864:20::32d as permitted sender) smtp.mailfrom=rwmaillists@googlemail.com X-Spamd-Result: default: False [1.25 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; FREEMAIL_FROM(0.00)[googlemail.com]; R_SPF_ALLOW(-0.20)[+ip6:2a00:1450:4000::/36]; TO_DN_NONE(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; DKIM_TRACE(0.00)[googlemail.com:+]; DMARC_POLICY_ALLOW(-0.50)[googlemail.com,quarantine]; RECEIVED_SPAMHAUS_PBL(0.00)[92.1.116.226:received]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[googlemail.com]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; RBL_DBL_DONT_QUERY_IPS(0.00)[2a00:1450:4864:20::32d:from]; DWL_DNSWL_NONE(0.00)[googlemail.com:dkim]; ARC_NA(0.00)[]; R_DKIM_ALLOW(-0.20)[googlemail.com:s=20161025]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_SPAM_SHORT(1.00)[0.996]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-hackers@freebsd.org]; NEURAL_SPAM_MEDIUM(1.00)[0.997]; RCPT_COUNT_ONE(0.00)[1]; SPAMHAUS_ZRD(0.00)[2a00:1450:4864:20::32d:from:127.0.2.255]; NEURAL_SPAM_LONG(0.26)[0.260]; RCVD_IN_DNSWL_NONE(0.00)[2a00:1450:4864:20::32d:from]; RCVD_TLS_ALL(0.00)[]; MAILMAN_DEST(0.00)[freebsd-hackers] Reply-To: rwmaillists@googlemail.com From: RW via freebsd-hackers X-Original-From: RW X-ThisMailContainsUnwantedMimeParts: N On Thu, 8 Jul 2021 10:19:07 +0300 Rozhuk Ivan wrote: > and sysctl tunings on desktop only: > > # SCHEDULER > kern.sched.steal_thresh=1 > kern.sched.balance=0 > kern.sched.balance_interval=1000 > kern.sched.affinity=10000 You missed out kern.sched.preempt_thresh=224 (perhaps because it's so well known). In my experience this makes a big difference for desktop use. If I set that and build on tmpfs, to minimise the effect of I/O contention, I don't see any discernible effect on Xfce when building world with -j4. This is on a bottom of the range i5 from 9 years ago. It's not particularly fast. I think the default only allows preemption by real-time and kernel threads.