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RE: [Xen-devel] [Patch] Buffer disk I/O requests
| To: | "Keir Fraser" <keir@xxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | RE: [Xen-devel] [Patch] Buffer disk I/O requests |
| From: | "Han, Weidong" <weidong.han@xxxxxxxxx> |
| Date: | Mon, 14 May 2007 20:52:13 +0800 |
| Delivery-date: | Mon, 14 May 2007 05:50:40 -0700 |
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| In-reply-to: | <C26E1386.EE10%keir@xxxxxxxxxxxxx> |
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| Thread-index: | AceWC1RtzMJy5K2DTwGmXANjr/voFgAF3jWkAABdhRA= |
| Thread-topic: | [Xen-devel] [Patch] Buffer disk I/O requests |
Buffered disk I/O improves disk I/O port access performance. It's similar to buffered vga which is mmio. We ran SysBench random file I/O test and found it reached about 10% improvement. --Weidong Keir Fraser wrote: > What sort of improvement does it achieve? It's a pretty hacky thing > to have to add... :-( > > -- Keir > > > On 14/5/07 10:36, "Han, Weidong" <weidong.han@xxxxxxxxx> wrote: > >> Disk I/O of VM is slow compared to native, I/O port access consumes >> time significantly, which could be partly improved with buffered I/O. >> The attached patch partly improves the performance of disk I/O >> through buffering Disk I/O requests. >> >> Signed-off-by: Zhiteng Huang <zhiteng.huang@xxxxxxxxx> >> Signed-off-by: Weidong Han <weidong.han@xxxxxxxxx> >> >> _______________________________________________ >> Xen-devel mailing list >> Xen-devel@xxxxxxxxxxxxxxxxxxx >> http://lists.xensource.com/xen-devel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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