From nobody Tue Dec 21 10:49:12 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 B73A01903B1A for ; Tue, 21 Dec 2021 10:49:12 +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 4JJCr832qhz4hQ9 for ; Tue, 21 Dec 2021 10:49:12 +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 4864F499 for ; Tue, 21 Dec 2021 10:49:12 +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 1BLAnCY7083159 for ; Tue, 21 Dec 2021 10:49:12 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 1BLAnCJw083158 for bugs@FreeBSD.org; Tue, 21 Dec 2021 10:49:12 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 254040] AMD 5950X hyperthreading strange performance swings Date: Tue, 21 Dec 2021 10:49:12 +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: 12.2-RELEASE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: avg@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=1640083752; 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=ZNRPOGfKSn2BIZdJqIsAFrMT6t4hw9GTcptt5a8YRIM=; b=S4ColsNuABUN5ezlJiWTDkfjI1jk1UBz/Xy2vMZdSzpaN7BCT0D63/8fWZHQOlt0vkTIqi eeEzRdHEk7PxtxoTK/5ATAJ62pbrO7/QS6AEhtcy6m5dBS+rWi5Qu6dXj+P20X6y6M1e9F sR+lwuOHRlsGTvNYLc8d4we1VbVKjjqgxdPChgbQ2w+e2XZCgmfn1OsB61BfBGGN/3wrnX FpEad9I2CRLNr7L0dxdgZ3IODVjys5SflLa8IWCw09fB2mgwzmdHomN9GC2m4BkUhdrM8W EeXBzWZU4XlXhwqRYRt6fYr/TUfyhpq8q6cpeDasjeJivptTcazV2RBcB/hJ5A== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1640083752; a=rsa-sha256; cv=none; b=lnKRMcVE8O6WSGz73f8AdNOYWZZHxfVAxpq0ZSK9huHsgrpyd3MkFVeC6akb6JBSgZTWxH SjDuBOTZsOS2pvO92WIR7/8EllyntUag4Zz2dAcea8IJ+a0MV75nMuCFtnoiWkbOeZySc4 cdJIBC+HqqpkiIAingNqoEMiI3gNiJeFgJMtN5HvmhO4lvcCqGqV10pQ3rxVP7Nyc0j2QE ltEpSobWc4RapgCgBn19bHs0JWJbcWGTizKjAnl8pBdzS8M/1DLpflsnZleuqvAoQE9SG0 p9nVEc0MILHNhzP6dKc+6ORPwIIM9KsqPeLf+R87SZJ+wcb7FjHUadodtwJdpg== ARC-Authentication-Results: i=1; mx1.freebsd.org; none X-ThisMailContainsUnwantedMimeParts: N https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D254040 --- Comment #4 from Andriy Gapon --- (In reply to Stefan E=C3=9Fer from comment #3) Thank you for the tests! Another observation is that if your t function is modified to pin bzip2 processes to CPUs (e.g. cpuset -l $((2 * i)) bzip2 ...), then the results a= re much more consistent. In fact, they match the best results from the origin= al test: $ ~/test.sh 4=20=20=20=20=20=20=20=20=20 1048576000 bytes transferred in 4.903489 secs (213842854 bytes/sec) 1048576000 bytes transferred in 4.904297 secs (213807597 bytes/sec) 1048576000 bytes transferred in 4.908786 secs (213612071 bytes/sec) 1048576000 bytes transferred in 4.915402 secs (213324567 bytes/sec) --=20 You are receiving this mail because: You are the assignee for the bug.=