From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anthony Liguori Subject: Re: Re: Improving hvm IO performance by using self IO emulator (YA io-emu?) Date: Thu, 22 Feb 2007 18:12:47 -0600 Message-ID: <45DE317F.6020106@us.ibm.com> References: <20070222052309.GA2764@saphi> <45DDBF76.1030805@us.ibm.com> <1172177938.45de041286155@imp.free.fr> <200702222124.16755.mark.williamson@cl.cam.ac.uk> <45DE0C21.20605@us.ibm.com> <20070223002628.4182db2d@lxorguk.ukuu.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20070223002628.4182db2d@lxorguk.ukuu.org.uk> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Alan Cc: tgingold@free.fr, xen-devel@lists.xensource.com, Mark Williamson List-Id: xen-devel@lists.xenproject.org Alan wrote: >> SATA can, yes. However, as you mention, SATA is very poorly supported. >> > > By what - it works very nicely in current Linux kernels, But it isn't supported by older kernels and most versions of Windows. A major use of virtualization is running older operating systems so depending on newer kernels is not really an option (if we have a new kernel, we'd prefer to use a paravirtual driver anyway). > including AHCI > with NCQ and multiple outstanding commands. The fact Xen isn't merged > and is living in prehistory is I'm afraid a Xen problem. > This discussion is independent of Xen. It's equally applicable to KVM and QEMU so please don't assume this has anything to do with Xen's merge status. Regards, Anthony Liguori