From mboxrd@z Thu Jan 1 00:00:00 1970 From: Richard Davies Subject: Re: Windows slow boot: contractor wanted Date: Sat, 18 Aug 2012 15:44:02 +0100 Message-ID: <20120818144402.GA4254@alpha.arachsys.com> References: <20120816104727.GA17166@alpha.arachsys.com> <502CDC0D.9080004@redhat.com> <20120817123642.GA16736@alpha.arachsys.com> <502E40D0.8030802@tuffmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Avi Kivity , kvm@vger.kernel.org, qemu-devel@nongnu.org To: Robert Vineyard Return-path: Content-Disposition: inline In-Reply-To: <502E40D0.8030802@tuffmail.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+gceq-qemu-devel=gmane.org@nongnu.org Sender: qemu-devel-bounces+gceq-qemu-devel=gmane.org@nongnu.org List-Id: kvm.vger.kernel.org Hi Robert, Robert Vineyard wrote: > Not sure if you've tried this, but I noticed massive performance > gains (easily booting 2-3 times as fast) by converting from RAW disk > images to direct-mapped raw partitions and making sure that IOMMU > support was enabled in the BIOS and in the kernel at boot time. Thanks for the suggestions, but unfortunately do we have IOMMU support enabled, and in production (rather than this test case), we run from LVM LVs, which are effectively direct raw partitions and still have this slow boot problem. Thanks anyway, Richard. From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:58990) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1T2kG1-0006Hk-VT for qemu-devel@nongnu.org; Sat, 18 Aug 2012 10:44:10 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1T2kG1-0005kQ-63 for qemu-devel@nongnu.org; Sat, 18 Aug 2012 10:44:09 -0400 Received: from alpha.arachsys.com ([91.203.57.7]:44069) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1T2kG1-0005kE-0N for qemu-devel@nongnu.org; Sat, 18 Aug 2012 10:44:09 -0400 Date: Sat, 18 Aug 2012 15:44:02 +0100 From: Richard Davies Message-ID: <20120818144402.GA4254@alpha.arachsys.com> References: <20120816104727.GA17166@alpha.arachsys.com> <502CDC0D.9080004@redhat.com> <20120817123642.GA16736@alpha.arachsys.com> <502E40D0.8030802@tuffmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <502E40D0.8030802@tuffmail.com> Subject: Re: [Qemu-devel] Windows slow boot: contractor wanted List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Robert Vineyard Cc: Avi Kivity , kvm@vger.kernel.org, qemu-devel@nongnu.org Hi Robert, Robert Vineyard wrote: > Not sure if you've tried this, but I noticed massive performance > gains (easily booting 2-3 times as fast) by converting from RAW disk > images to direct-mapped raw partitions and making sure that IOMMU > support was enabled in the BIOS and in the kernel at boot time. Thanks for the suggestions, but unfortunately do we have IOMMU support enabled, and in production (rather than this test case), we run from LVM LVs, which are effectively direct raw partitions and still have this slow boot problem. Thanks anyway, Richard.