From owner-freebsd-current@FreeBSD.ORG Tue Nov 24 18:00:42 2009 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id E7CFD106566C for ; Tue, 24 Nov 2009 18:00:42 +0000 (UTC) (envelope-from kevin@your.org) Received: from mail.your.org (chi02.mail.your.org [204.9.55.23]) by mx1.freebsd.org (Postfix) with ESMTP id AEB3C8FC0A for ; Tue, 24 Nov 2009 18:00:42 +0000 (UTC) Received: from mail.your.org (chi02.mail.your.org [204.9.55.23]) by mail.your.org (Postfix) with ESMTP id 21F5A1807428 for ; Tue, 24 Nov 2009 18:00:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=your.org; h=content-type :mime-version:subject:from:in-reply-to:date :content-transfer-encoding:message-id:references:to; s=selector1 ; bh=fZwQmY0HffVn/BELmXhwkE/l5NQ=; b=cK3DfKehC3RgDWivSSPPOXNC2ho s7GbZOo5Ow4cY3/ntwFRA0/ly0l1odEGAxYLpyBQCgbr9n1APN9ZvRtOixk5ni1i RxOx8Wjy4yRxGXX7S7xfg408z2jxks37Z3Bo8SNVxBdXP5/PZ3XRsv7E10fyOH02 4azp24Y9ZtWxkCyk= DomainKey-Signature: a=rsa-sha1; c=nofws; d=your.org; h=content-type :mime-version:subject:from:in-reply-to:date :content-transfer-encoding:message-id:references:to; q=dns; s= selector1; b=IJVtb4lTRCO6Bqzcx74vyvznVKD58eBDS2XBlHIi47rCog1X3rQ vR+Q0mAc/3VddZA1DAjgUz/v2SIpvmkq1BOX2gBBvZTVdOU2ZpOYcyR4LsII7TkM ICYdp7W/2zr76CsN8AH6s5qjakPwQR+dGEqnv1OtPQbnM7JlKzAH3lkU= Received: from vpn177.ord02.your.org (vpn177.ord02.your.org [204.9.55.177]) by mail.your.org (Postfix) with ESMTPA id C3C851807418 for ; Tue, 24 Nov 2009 18:00:41 +0000 (UTC) Content-Type: text/plain; charset=us-ascii; format=flowed; delsp=yes Mime-Version: 1.0 (Apple Message framework v1076) From: Kevin In-Reply-To: <3EA83F9F-BE44-4C64-852F-CDC09FB63B94@your.org> Date: Tue, 24 Nov 2009 12:00:41 -0600 Content-Transfer-Encoding: 7bit Message-Id: References: <3EA83F9F-BE44-4C64-852F-CDC09FB63B94@your.org> To: freebsd-current@freebsd.org X-Mailer: Apple Mail (2.1076) Subject: Re: 8.0 still doesn't boot in Xen (kern/138863) X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 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: Tue, 24 Nov 2009 18:00:43 -0000 On Nov 24, 2009, at 11:20 AM, Kevin wrote: > > Is it too late in the 8.0 release schedule to look at kern/138863? > Between 7.x and 8.0 the kernel can no longer boot under Xen due to > changes involving CLFLUSH. The effect is a crash very early in the > boot, with no workaround. (This is under Xen's fully virtualized > mode, not the XEN platform port underway.) > > This was also mentioned on the Xen mailing lists back in September (http://lists.freebsd.org/pipermail/freebsd-xen/2009-September/000310.html > ) but nothing has been committed to fix this yet. > > XenServer is getting pretty popular in some enterprise and hosting > environments, so having 8.0 not bootable would be a bit > disappointing. :) I was just pointed to the change from a couple of days ago, adding the tunable "hw.clflush_disable". This looks like it might do what I need, so I'm building a new bootable CD to find out and update the PR. This should probably be documented somewhere, just so someone in a similar situation even knows about this tunable. -- Kevin