From nobody Thu Dec 02 00:17:13 2021 X-Original-To: bugs@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 3695318B4BD7 for ; Thu, 2 Dec 2021 00:17:14 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (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 (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4J4Gjj4dCCz3Jsc for ; Thu, 2 Dec 2021 00:17:13 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2610:1c1:1:606c::50:1d]) (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 did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 74774139F8 for ; Thu, 2 Dec 2021 00:17:13 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id 1B20HDrO068507 for ; Thu, 2 Dec 2021 00:17:13 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 1B20HDIg068506 for bugs@FreeBSD.org; Thu, 2 Dec 2021 00:17:13 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 228076] [sched_ule] Not stealing process from loaded CPU Date: Thu, 02 Dec 2021 00:17:13 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 11.1-RELEASE X-Bugzilla-Keywords: patch X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: truckman@FreeBSD.org X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated List-Id: Bug reports List-Archive: https://lists.freebsd.org/archives/freebsd-bugs List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-bugs@freebsd.org MIME-Version: 1.0 ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1638404233; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=TytNEvxt94DAH8Nay84cwlLjER4ciQyT0xsM9hVujCg=; b=c8/oDlESR5TvibKKLLX5XHnQEI4E77vQ5txJhbnzofY6tRQrr3WM3PZ7V5/ZCMYnpgQsZz u4bbLksvAsGu56JR1LRBMFJQMDnadZc0zSFLMn/mHkOzvfTxQ5MhAn3zhMvj/jC92K7h6M kn3YlpFdnVKsUKGrga0nDVrfyuyxnBlc1qNBCITMQADl2srWbNPX2ekBwyBxvWOF3o9il9 mHQ3PbB5F9kn//0N4ayOL+48j9RR1ypYJ9t762ERS8u5dZUtVjKcgDiFOzcxvNpKnCLpPW vPlgGBveI1CFzKE81nb/w2HDeI6EPO5AZL1DasZLbhN0gKw1VoF0WU29JeF1oA== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1638404233; a=rsa-sha256; cv=none; b=QsoJdjftH6xB02M3OAj3Nsfig13hgpwtBROXcWkkwem6uMrzlBguusXgngZE7ErA2SMEeT 91tspjA9jx0qKcGN1SzKlLynx4NgJ03EEponhJ5ee+MlBUmSqZUK7z1GM/JDbDFFZY0Bjp 4CNabH3Ma9TbS0yZjwEMEkg61V3g55GXfP9gHzGZV9eHEicLAjoiz2l3IF4oT857P0Sv7v BIZXJcLGkriudrj/4kPRea8GC9QHKUafIMlhKg9KXkddrsMJVodo1gMqSmp8xh4dfqw3ye Js670fMo1SjbRmMFuwPeETN8Zb0RasfiNIy4q6uOGJtDrpNPayAYaYi3tMQOHw== ARC-Authentication-Results: i=1; mx1.freebsd.org; none X-ThisMailContainsUnwantedMimeParts: N https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D228076 --- Comment #17 from Don Lewis --- I think td_pinned is the problem. The thread can't move until that flag is cleared, and that can't happen until it is able to get some CPU cycles to g= et through the section of code that td_pinned is protecting. I can see how this could happen in the general case, but in this particular case how does the ifconfig thread manage to make enough progress to set td_pinned while competing with the hard realtime thread that is hogging the cpu? --=20 You are receiving this mail because: You are the assignee for the bug.=