From mboxrd@z Thu Jan 1 00:00:00 1970 From: Will Trives Subject: kvm: qemu: remove SIGUSR2 from io_sigset patch slows VMs Date: Sun, 20 Jan 2008 10:19:49 +1100 Message-ID: <1200784789.6255.7.camel@Athas> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.vger.kernel.org Hello, This patch : kvm: qemu: remove SIGUSR2 from io_sigset Applied 15th Jan 2008 looks to kill I/O performance for me. As soon as I revert it my VMs are much faster. I don't really use SMP for my guests, perhaps this patch has made uniprocessor VMs slower ? The issue occurs even when using RAW images as well as QCOW2 it also occurs if the guest is running Windows OR Linux. Regards, Will Trives ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/