From owner-freebsd-bugs@freebsd.org Thu Aug 18 11:25:26 2016 Return-Path: Delivered-To: freebsd-bugs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 4691EBBE66A for ; Thu, 18 Aug 2016 11:25:26 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 1E11B1287 for ; Thu, 18 Aug 2016 11:25:26 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id u7IBPPOC012034 for ; Thu, 18 Aug 2016 11:25:25 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 211962] bxe driver queue soft hangs and flooding tx_soft_errors Date: Thu, 18 Aug 2016 11:25:26 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 10.3-RELEASE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: aler@playground.ru X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Aug 2016 11:25:26 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D211962 Bug ID: 211962 Summary: bxe driver queue soft hangs and flooding tx_soft_errors Product: Base System Version: 10.3-RELEASE Hardware: Any OS: Any Status: New Severity: Affects Some People Priority: --- Component: kern Assignee: freebsd-bugs@FreeBSD.org Reporter: aler@playground.ru Hardware (from dmesg): QLogic NetXtreme II BCM57711E 10GbE (A0) BXE v:1.78.= 79 (but this seems not important here) Sometimes (randomly) bxe driver reduces its sending speed to very slow valu= es, and one or more queues fastly increases dev.bxe.#.queue.#.tx_soft_errors va= lue. This can be stopped and returned to normal operation only by restarting the interface (ifconfig down + ifconfig up). It seems i found the bug that causes this. In bxe_tx_mq_start_locked(), when we have both pending and new packet, it f= irst tries to enqueue new packet and exits on fail. After that, it dequeues pend= ing packet and tryes to handle it. Sometimes the tx queue gets overflowed by accident. It is nothing bad, bad = what happens next: bxe_tx_mq_start_locked() getting called again and again, with= new packets that TCP layer trying to send. Everytime called it tryes to enqueue them, fails and exits, having no way to handle pending packets and reduce q= ueue length. I'm new to bxe driver source code and can be wrong but the patch seems fixed the problem. --=20 You are receiving this mail because: You are the assignee for the bug.=