From owner-freebsd-current@FreeBSD.ORG Thu Feb 19 20:09:10 2015 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 700C5E9A; Thu, 19 Feb 2015 20:09:10 +0000 (UTC) Received: from kib.kiev.ua (kib.kiev.ua [IPv6:2001:470:d5e7:1::1]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id D16CFB3A; Thu, 19 Feb 2015 20:09:09 +0000 (UTC) Received: from tom.home (kostik@localhost [127.0.0.1]) by kib.kiev.ua (8.14.9/8.14.9) with ESMTP id t1JK91IV036899 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Thu, 19 Feb 2015 22:09:01 +0200 (EET) (envelope-from kostikbel@gmail.com) DKIM-Filter: OpenDKIM Filter v2.9.2 kib.kiev.ua t1JK91IV036899 Received: (from kostik@localhost) by tom.home (8.14.9/8.14.9/Submit) id t1JK91T9036898; Thu, 19 Feb 2015 22:09:01 +0200 (EET) (envelope-from kostikbel@gmail.com) X-Authentication-Warning: tom.home: kostik set sender to kostikbel@gmail.com using -f Date: Thu, 19 Feb 2015 22:09:00 +0200 From: Konstantin Belousov To: Neel Natu Subject: Re: Xen HVM Panic, HEAD Message-ID: <20150219200900.GH34251@kib.kiev.ua> References: <54E2BF1E.4090002@ignoranthack.me> <20150217085657.GR34251@kib.kiev.ua> <54E39DC4.4010802@ignoranthack.me> <20150217202653.GW34251@kib.kiev.ua> <54E3A4D9.4080604@ignoranthack.me> <54E56E87.6010704@ignoranthack.me> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23 (2014-03-12) X-Spam-Status: No, score=-2.0 required=5.0 tests=ALL_TRUSTED,BAYES_00, DKIM_ADSP_CUSTOM_MED,FREEMAIL_FROM,NML_ADSP_CUSTOM_MED autolearn=no autolearn_force=no version=3.4.0 X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on tom.home Cc: Adrian Chadd , freebsd-current X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 19 Feb 2015 20:09:10 -0000 On Thu, Feb 19, 2015 at 11:50:49AM -0800, Neel Natu wrote: > Hi Adrian, > > On Wed, Feb 18, 2015 at 10:09 PM, Adrian Chadd wrote: > > Hi, > > > > Since this is the (at least) second round of "x2apic support broke me" > > changes, can we please either back them out or set it to default to > > '0' for now? > > > > I don't think that is necessary. > > This is -current and there is a tunable to disable x2apic on platforms > that are experiencing issues. More importantly the issues that have > been reported are being resolved in a timely manner (for e.g., > suspend/resume). There is only one really enigmatic issue, it was reported that sandy bridge laptop being unable to start APs. Koop stopped responding, so the issue is not progresed. My current idea is that a cause might be reduced intervals between init/startup ipis due to x2apic not requiring wait for icr idle. Anyway, I do not see it worth even discussing the revert or default' frobbing for now. The commit went mostly event-less for such kind of change.