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From: | John Coiner |
Subject: | Re: [Qemu-devel] [patch] non-blocking disk IO |
Date: | Mon, 03 Oct 2005 08:41:46 -0400 |
User-agent: | Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.11) Gecko/20050731 |
Magnus, I don't think the Windows 2000 install hack will ever be obsolete.The installer assumes that a hard disk will take nonzero time to read some data. QEMU always services a read in zero-guest-time. (With the nonblocking IO patch, zero-guest-time reads still occur, when the requested data is in the host's file cache.)
I doubt the IDE spec allows Windows to make this assumption... but the assumption is there, and we work around it by adding a delay that's visible to the guest.
-- John
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