From owner-freebsd-current@freebsd.org Tue Mar 23 14:54:41 2021 Return-Path: Delivered-To: freebsd-current@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 35FB85B101B for ; Tue, 23 Mar 2021 14:54:41 +0000 (UTC) (envelope-from boulder@renzel.net) Received: from mx1.renzel.net (mx1.renzel.net [195.243.213.130]) (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 "*.renzel.net", Issuer "DigiCert SHA2 Secure Server CA" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4F4ZCN3ZbWz3DSM for ; Tue, 23 Mar 2021 14:54:40 +0000 (UTC) (envelope-from boulder@renzel.net) X-Virus-Scanned: GDATA Antivirus at gdata-milter.renzel.de.isb X-Spam-Score: 0 X-Spam-Level: X-Spam-Status: No, score=-999.0 required=9.0 tests=ALL_TRUSTED=-1000, BAYES_50=1,NICE_REPLY_A=-0.001 autolearn=no autolearn_force=no version=3.4.2 Received: from dublin.vkf.isb.de.renzel.net (unknown [62.159.136.5]) by mx1.renzel.net (smtpd) with ESMTP id B9C9EE53ED; Tue, 23 Mar 2021 15:54:37 +0100 (CET) Received: from asbach.renzel.net (unknown [172.18.96.1]) by dublin.vkf.isb.de.renzel.net (Postfix) with ESMTPA id A00EC8626B; Tue, 23 Mar 2021 15:54:37 +0100 (CET) Subject: Re: freebsd 13 ryzen micro stutter To: freebsd-current@freebsd.org, freebsd@grem.de, monochrome@twcny.rr.com References: <20210323101146.18c9a969@bsd64.grem.de> From: "Nils B." Message-ID: <711646dd-1ff7-32e9-f3da-0add1565519a@renzel.net> Date: Tue, 23 Mar 2021 15:54:37 +0100 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:78.0) Gecko/20100101 Thunderbird/78.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on nijmegen.renzel.net X-Rspamd-Queue-Id: 4F4ZCN3ZbWz3DSM X-Spamd-Bar: --- Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=pass (mx1.freebsd.org: domain of boulder@renzel.net designates 195.243.213.130 as permitted sender) smtp.mailfrom=boulder@renzel.net X-Spamd-Result: default: False [-3.50 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; RWL_MAILSPIKE_GOOD(0.00)[195.243.213.130:from]; R_SPF_ALLOW(-0.20)[+mx]; MIME_GOOD(-0.10)[text/plain]; TO_DN_NONE(0.00)[]; DMARC_NA(0.00)[renzel.net]; NEURAL_HAM_LONG(-1.00)[-1.000]; RCVD_COUNT_THREE(0.00)[3]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_IN_DNSWL_MED(-0.20)[195.243.213.130:from]; NEURAL_HAM_SHORT(-1.00)[-0.999]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:3320, ipnet:195.243.0.0/16, country:DE]; RCVD_TLS_LAST(0.00)[]; MAILMAN_DEST(0.00)[freebsd-current] X-Mailman-Approved-At: Tue, 23 Mar 2021 15:31:33 +0000 X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 23 Mar 2021 14:54:41 -0000 Hi, On 23.03.21 10:34, myfreeweb wrote: > None of these should be an issue, but: > > sysctl kern.sched.steal_thresh=1 > > For some reason with the default value of 2, I'm seeing weird stuttering in youtube > videos, games, etc. on a 5950X system. 1 (or 0, IIRC) works fine. yes, finally... Using a Ryzen 1700, Asrock AB350 Pro4 and Radeon RX460 and got that awful micro stuttering all the time; not only under FreeBSD 13.0-ALPHA3 now, but also under FreeBSD 12-STABLE in the past. Occurences were during listening to music using MPV (one-second-*krk*-loops); watching YouTube videos (video hangs for a second but audio continues) and often simply during mouse movements where even MouseKeyPress- and MouseKeyRelease-events just didn't reach the system at all. Setting kern.sched.steal_thresh=0 eliminates these micro stutterings in the whole system. I also would really, really like to know the reason why this parameter has such an impact... Many thanks for the hint and BR, Nils