From owner-freebsd-amd64@freebsd.org Tue Feb 23 21:30:45 2016 Return-Path: Delivered-To: freebsd-amd64@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 AB1AEAB2D4A for ; Tue, 23 Feb 2016 21:30:45 +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 9E3A7191 for ; Tue, 23 Feb 2016 21:30:45 +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 u1NLUjAC041136 for ; Tue, 23 Feb 2016 21:30:45 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-amd64@FreeBSD.org Subject: [Bug 207446] Hang bringing up vtnet(4) on >8 cpu GCE VMs Date: Tue, 23 Feb 2016 21:30:45 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 10.3-BETA2 X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: wac@google.com 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 cc attachments.created 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-Mailman-Approved-At: Tue, 23 Feb 2016 22:03:02 +0000 X-BeenThere: freebsd-amd64@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Porting FreeBSD to the AMD64 platform List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 23 Feb 2016 21:30:45 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D207446 Bug ID: 207446 Summary: Hang bringing up vtnet(4) on >8 cpu GCE VMs Product: Base System Version: 10.3-BETA2 Hardware: amd64 OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: freebsd-bugs@FreeBSD.org Reporter: wac@google.com CC: freebsd-amd64@FreeBSD.org CC: freebsd-amd64@FreeBSD.org Created attachment 167336 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D167336&action= =3Dedit patch to sys/dev/virtio/network/if_vtnetvar.h FreeBSD on Google Compute Engine currently requires "hw.vtnet.mq_disable=3D= 1" on virtual machines of more than 8 CPUs to avoid a hang when bringing up the v= tnet interface. I have prepared a patch which raises the VTNET_MAX_QUEUE_PAIRS to 64 which solves this hang on GCE VMs with 64 or fewer CPUs.=20 With this patch, the release engineer should be able to remove the hw.vtnet.mq_disable line from the /boot/loader.conf that is placed in images intended for Google Compute Engine and users should see the benefits of multiqueue as a result. The current limit of 8 is in CURRENT as well as earlier release branches (e= .g. stable/10). --=20 You are receiving this mail because: You are on the CC list for the bug.=