[Xen-devel] [Patch] Buffer disk I/O requests

["Han, Weidong" <weidong.han@xxxxxxxxx>]

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>

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