Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759307AbXEJKA3 (ORCPT ); Thu, 10 May 2007 06:00:29 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754123AbXEJKAW (ORCPT ); Thu, 10 May 2007 06:00:22 -0400 Received: from ug-out-1314.google.com ([66.249.92.175]:58256 "EHLO ug-out-1314.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754504AbXEJKAV (ORCPT ); Thu, 10 May 2007 06:00:21 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=uOImHWgU8twG56BStBZeTM1bZPC4UCO1AH5o2jIUypIjVVYgZ1UmVq1m5BClh4ClSCHi+biLIfdWiZ1Y6N+kIDyT/TIIIZ8IbBWwg0oyPR2pBDhwCVuss3hRoxZ/bmgj6gKbH+WX+drKArL3SgLY+rR8rqTf1toAkrPeWeNIiZw= Message-ID: Date: Thu, 10 May 2007 18:00:15 +0800 From: "Zhao Forrest" To: "Andi Kleen" Subject: Re: [discuss] A question about GART aperture unmap Cc: discuss@x86-64.org, linux-kernel@vger.kernel.org In-Reply-To: <20070510094908.GB14898@one.firstfloor.org> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <20070510094908.GB14898@one.firstfloor.org> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 770 Lines: 19 > > > > As we know that CPU prefetch never cross the page boundary, in this > > That only applies to sequential prefetch. But speculative execution can > prefetch pretty much any address. That is why the clear_kernel_mapping is > needed. In BIOS setup, there's "Speculative TLB Reload". Is this "Speculative TLB Reload" the same as your mentioned speculative execution? After disabling "Speculative TLB Reload" in BIOS, we could also experience sync flood and reset when commenting out clear_kernel_mapping()...... Forrest - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/