From nobody Mon Mar 27 14:31:27 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 4PlbGF2HgFz41cwL for ; Mon, 27 Mar 2023 14:45:41 +0000 (UTC) (envelope-from pmc@citylink.dinoex.sub.org) Received: from uucp.dinoex.org (uucp.dinoex.org [IPv6:2a0b:f840::12]) (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 "uucp.dinoex.sub.de", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4PlbGD6zBdz45T0; Mon, 27 Mar 2023 14:45:40 +0000 (UTC) (envelope-from pmc@citylink.dinoex.sub.org) Authentication-Results: mx1.freebsd.org; none Received: from uucp.dinoex.org (uucp.dinoex.org [IPv6:2a0b:f840:0:0:0:0:0:12]) by uucp.dinoex.org (8.17.1/8.17.1) with ESMTPS id 32REj9U8066388 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NO); Mon, 27 Mar 2023 16:45:09 +0200 (CEST) (envelope-from pmc@citylink.dinoex.sub.org) Received: (from uucp@localhost) by uucp.dinoex.org (8.17.1/8.17.1/Submit) with UUCP id 32REj9d4066387; Mon, 27 Mar 2023 16:45:09 +0200 (CEST) (envelope-from pmc@citylink.dinoex.sub.org) Received: from disp.intra.daemon.contact (disp-e.intra.daemon.contact [IPv6:fd00:0:0:0:0:0:0:112]) by admn.intra.daemon.contact (8.17.1/8.17.1) with ESMTPS id 32REVie5064944 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=OK); Mon, 27 Mar 2023 16:31:44 +0200 (CEST) (envelope-from pmc@citylink.dinoex.sub.org) Received: from disp.intra.daemon.contact (localhost [127.0.0.1]) by disp.intra.daemon.contact (8.17.1/8.17.1) with ESMTPS id 32REVRNc003965 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NO); Mon, 27 Mar 2023 16:31:27 +0200 (CEST) (envelope-from pmc@citylink.dinoex.sub.org) Received: (from pmc@localhost) by disp.intra.daemon.contact (8.17.1/8.17.1/Submit) id 32REVRI9003964; Mon, 27 Mar 2023 16:31:27 +0200 (CEST) (envelope-from pmc@citylink.dinoex.sub.org) X-Authentication-Warning: disp.intra.daemon.contact: pmc set sender to pmc@citylink.dinoex.sub.org using -f Date: Mon, 27 Mar 2023 16:31:27 +0200 From: Peter To: freebsd-hackers@freebsd.org Cc: Matthias Andree Subject: Re: Periodic rant about SCHED_ULE Message-ID: 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-Disposition: inline In-Reply-To: <1d4d589c-eafe-6219-2e6e-884d49b7ff57@FreeBSD.org> X-Milter: Spamilter (Reciever: uucp.dinoex.org; Sender-ip: 0:0:2a0b:f840::; Sender-helo: uucp.dinoex.org;) X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (uucp.dinoex.org [IPv6:2a0b:f840:0:0:0:0:0:12]); Mon, 27 Mar 2023 16:45:12 +0200 (CEST) X-Rspamd-Queue-Id: 4PlbGD6zBdz45T0 X-Spamd-Bar: ---- X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[]; ASN(0.00)[asn:205376, ipnet:2a0b:f840::/32, country:DE] X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-ThisMailContainsUnwantedMimeParts: N Quoting Matthias Andree : >There is some analogy - not sure if we can learn something from it. TCP >(the network's Transmission Control Protocol) has the big overspanning >item "fairness between streams", and possibly we need to put this into >focus. It is a delicate matter there also, and gladly we have plugable modules to do the job. (On my site only 'vegas' with specific parameters does give satisfying results - but then it does). >What I currently fail to understand is why we have not gone to improving >SCHED_ULE yet. This seems to be the first time I've paid attention to >some details. Have I missed similar discussion in the past? Or have >they stalled soonish? Indeed I don't remember these discussion going into the technical details inside the scheduler. Maybe nobody (including me) was eloquent enough to push it there?