From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michael Tokarev Subject: Re: linux-aio usable? Date: Mon, 08 Mar 2010 23:19:35 +0300 Message-ID: <4B955BD7.1010508@msgid.tls.msk.ru> References: <4B94BF05.20609@redhat.com> <4B9559DA.8000407@msgid.tls.msk.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: Bernhard Schmidt , kvm@vger.kernel.org To: Avi Kivity Return-path: Received: from isrv.corpit.ru ([81.13.33.159]:38104 "EHLO isrv.corpit.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755653Ab0CHUTg (ORCPT ); Mon, 8 Mar 2010 15:19:36 -0500 In-Reply-To: <4B9559DA.8000407@msgid.tls.msk.ru> Sender: kvm-owner@vger.kernel.org List-ID: Michael Tokarev wrote: [] > Apparently that does not quite work. I just re-compiled kvm with > --enable-linux-aio (actually I just installed libaio-dev on debian > and qemu-kvm's configure picked it up automatically), and tried > a guest. But any I/O fails. It has nothing to do with kvm. It is compat_ioctl32 in the kernel wrt aio calls. Historically I've a 64bit kernel with 32bit userland, and tried 32bit kvm too, and that does not work. But 64bit kvm works just fine with aio, and the performance numbers are indeed better. Thanks! /mjt