From nobody Sat May 29 11:45:15 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 39F98D7ED63 for ; Sat, 29 May 2021 11:45:16 +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 4Fsfqw16yXz4kj4 for ; Sat, 29 May 2021 11:45:16 +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 0F913163F for ; Sat, 29 May 2021 11:45:16 +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 14TBjG48098708 for ; Sat, 29 May 2021 11:45:16 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 14TBjGMq098707 for net@FreeBSD.org; Sat, 29 May 2021 11:45:16 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: Sat, 29 May 2021 11:45:15 +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 #9 from Christos Chatzaras --- HPTS system is "kern.eventtimer.timer=3DHPET", right? With HPET I see (with "top") ~ 2 times more interrupts in comparison with LAPIC. I tried again to reproduce the issue with a STABLE/13 kernel and it exists = too. Next I will try with a CURRENT kernel as I see some fixes for RACK. Regarding the "stuck" connection in LAST_ACK state someone tries to brute f= orce SSH and "sshguard" blocks the connections (I have 4 "stuck" connection for = SSH at the moment). Also I have 2 "stuck" connections in port 80 from "wrk benchmark". I found this: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D25986 which is old PR b= ut @johalun replied that he can see this issue few months ago. But they are not talking about "rack" so this is not related. The only relation with "rack" = is that these "stuck" connections create interrupts. At the moment these connections "stuck" for more than 35 minutes. Also I see some "stuck" connections in other servers that use "freebsd" stack. --=20 You are receiving this mail because: You are the assignee for the bug.=