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RE: [Xen-devel] [PATCH] patch to buffer write ioreq

>How does win2k fail? Does it make assertions about device access 

Yes, seems it makes assertions about standard VGA latencies.

When we boot win2k guests, just after windows enters standard VGA
graphics mode, it keeps updating a flashing bar to indicate it's in
booting process, but seems this screen updating in win2k guest is
executed as a very high priority task, so win2k can not boot.
The phenomenon is, If in 10ms, about 600 standard VGA MMIO writes can
happen, win2k can boot normally. If less or about 500 writes happen, it
can _not_ boot and just keeps updating the flashing bar, we ever waited
for several hours to see if it can boot, but the guest made no more
progress. I guess there is a threshold for win2k to boot. 
BTW, winxp is OK.


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