From nobody Wed Feb 9 01:17:05 2022 X-Original-To: acpi@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 394AD19C7244 for ; Wed, 9 Feb 2022 01:17:06 +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 4Jthmx71STz3PQ0 for ; Wed, 9 Feb 2022 01:17:05 +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 CBF8623FAB for ; Wed, 9 Feb 2022 01:17:05 +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 2191H5DU077197 for ; Wed, 9 Feb 2022 01:17:05 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 2191H5bZ077196 for acpi@FreeBSD.org; Wed, 9 Feb 2022 01:17:05 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: acpi@FreeBSD.org Subject: [Bug 173541] High (0.60+, 1.00) idle load averages Date: Wed, 09 Feb 2022 01:17:05 +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: 13.0-RELEASE X-Bugzilla-Keywords: needs-qa, regression X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: mav@FreeBSD.org X-Bugzilla-Status: Open X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: acpi@FreeBSD.org X-Bugzilla-Flags: maintainer-feedback? maintainer-feedback? mfc-stable13? mfc-stable12? 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: ACPI and power management development List-Archive: https://lists.freebsd.org/archives/freebsd-acpi List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-acpi@freebsd.org MIME-Version: 1.0 ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1644369426; 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=txrH06Y6PhMmFPF5ry1KnspUY5uImONpjsjAw9vJYeU=; b=PnAv5+ziPvsqAtUQ4PijMW7SlQ9yDPw/pN6fhafu1C2rXCDyGZK+tsEyqDZ7i+H/RxZcl3 kb02TVrHhsHIWUmDJrlFIoE3IcDaFKnvgQI+uq5PCW2HBNuzG6u+HzwZnE5mtyMapDSwAx Lcjx/sfkAYUB4f5z9H0E/52r7FoA/luQbsc+UF+qvzErRyfXRIv2f26TR0Lo+UE9YXM/6N eE8lLEzPrgFN0kNHdVIkMd/iyTPCnyMtcTGGq+62bUAjAt2ckU/TQfBkqjJH6pF4X7aHnS XgWOIizv/AXPoyFvWBaGyGOJB8tVjLfB412USf/cN7gnc8ilLTab0W5jYzCudQ== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1644369426; a=rsa-sha256; cv=none; b=CeSas/zFyNXj9GhBrLJvti+YFi5GpwGSkI/bNwUQ9/BNO/qxzmcoc8F8magUzcXZxKN9d8 BJTCm4fDqyG5+WMY54wfiDW6dyl6tzcsBEpZpFnJeXCAICRlVnWJSXMwJcluyCtoRYkFt7 DropMOk+jnxn17oPrO6JpwNQIasXIL2WWIYqoQ+Lkwv4/qRjs+ToxVkgRsp4KYZQYAv5+k KQ26eg9yckX6xhaETkuFjzi4kPjj5BSKKo017DAP+ew6eTSECR/+91pGX6AzRsds1a7DjN 36eyo3NgPYwEDzr/Xk0boB6R6BE4V3VhdJb5Ctz85K+hDO94XAibsIhFbNzYpg== ARC-Authentication-Results: i=1; mx1.freebsd.org; none X-ThisMailContainsUnwantedMimeParts: N https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D173541 --- Comment #27 from Alexander Motin --- @Kubilay Kocak, I don't think this should be related to timecounters. It m= ust be a coincidence. As I have written 7 years ago in comment 9, I believe it= is a result of some synchronization between load average callouts and some oth= er events. Since you've mentioned HPET, I'd think towards not HPET as timecounter, but as HPET as eventtimer. Depending on hardware and number of CPUs, kernel may have to use single HPET interrupt to deliver timer interru= pts to multiple CPUs. As result, it is very simple to have two or more CPU to = wake up from a long sleep same time (one where HPET interrupt is routed to and another where timer event is actually scheduled), that may cause load avera= ge callout to sample simultaneous threads. --=20 You are receiving this mail because: You are the assignee for the bug.=