From nobody Fri May 28 19:00:15 2021 X-Original-To: net@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 7A7E2D784F5 for ; Fri, 28 May 2021 19:00:15 +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 4FsDXH2qCRz4YHP for ; Fri, 28 May 2021 19:00:15 +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 44F681C894 for ; Fri, 28 May 2021 19:00:15 +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 14SJ0FKq034154 for ; Fri, 28 May 2021 19:00:15 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 14SJ0FSC034153 for net@FreeBSD.org; Fri, 28 May 2021 19:00:15 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: net@FreeBSD.org Subject: [Bug 256217] [tcp] High system load because of interrupts with RACK Date: Fri, 28 May 2021 19:00:15 +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: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: chris@cretaforce.gr X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: net@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: Networking and TCP/IP with FreeBSD List-Archive: https://lists.freebsd.org/archives/freebsd-net List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-net@freebsd.org MIME-Version: 1.0 X-ThisMailContainsUnwantedMimeParts: N https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D256217 --- Comment #5 from Christos Chatzaras --- To avoid reboot I did this which I believe is the same: sysctl net.inet.tcp.functions_default net.inet.tcp.functions_default: freebsd kldload tcp_rack sysctl net.inet.tcp.functions_default=3Drack I restart all services so new connections (mostly nginx) use "rack". I wait for few minutes and interrupts increase to ~5% sysctl net.inet.tcp.functions_default=3Dfreebsd tcpdrop -S rack Interrupts decrease to ~ 0.3% (looks like less connections =3D less interru= pts) New connections still use "rack", so I restart again all services. Now all connections use "freebsd" and interrupts decrease to ~ 0.0% ---- Also something I notice is that during the issue if I run "sysctl kern.eventtimer.timer=3DHPET" then interrupts immediately increase. If I run "sysctl kern.eventtimer.timer=3DLAPIC" the interrupts immediately decrease. ---- So it looks like that active rack connections cause the issue. --=20 You are receiving this mail because: You are the assignee for the bug.=