From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rik van Riel Subject: Re: [PATCH][RFC] open HVM backing storage with O_SYNC Date: Fri, 28 Jul 2006 13:02:40 -0400 Message-ID: <44CA4330.7010007@redhat.com> References: <44C9B75B.7060809@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <44C9B75B.7060809@redhat.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org Rik van Riel wrote: > Any comments on this patch? I got some comments from Alan, who would like to see this behaviour tunable with hdparm from inside the guest. This requires larger qemu changes though, to be specific an ->fsync callback into each of the backing store drivers, so that is something for the qemu mailing list. The current bottleneck seems to be that MAX_MULT_COUNT is only 16. I will try raising this to 256 so we can transport a lot more data per world and domain switch... -- "Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it." - Brian W. Kernighan