Hi,

This set of patches remarkably accelerates IDE PIO on HVM/IA64. I got a throughput of 2.11MB/sec in disk read performance. Without it, it was only 64kB/sec.

I posted the prototype once. http://lists.xensource.com/archives/html/xen-devel/2006-12/msg00077.html

The basic idea is to add a buffering mechanism in a hypervisor. I know this approach is not sophisticated. But there is no other good way in IA64 which has no string instructions like x86's.

This patchset is indispensable to support windows/ia64 on HVM since installing windows and crash dumping is terribly slow.

There is no effect on x86 side. Please apply to xen-unstable/3.0.5.

Thanks, Kouya