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List:       qemu-devel
Subject:    [Qemu-devel] [PATCH] Qemu can dance speed-step - let windows see
From:       Juergen Pfennig <info () j-pfennig ! de>
Date:       2006-02-07 20:40:35
Message-ID: 200602072140.36008.info () j-pfennig ! de
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Hi,

the following is stuff from qemu-xp and cannot directly be applied to the
qemu sources. Anyhow: you can see what I have done. As a result windows
displays the correct time. Also the poll() was a bit optimised. The timer
stuff was changed to get some cpu cycles back. On a system with low CPU
load the timer might consume 0.5% of the time, but under heavy CPU load
you might see 5% time spent by the timer (actually I plan to dynamically
reduce the alarm timer frequency in future versions). Other clean-ups are
(and will be) related to memory-locality of frequently used data.

I have not seen any negative side effects of my code. TCP/IP still works
(they use the cpu-clock-counter?). The code was not written for gamers...
fast animations will not run precise. The deal is: don't waste cpu cycles
but make the windows clock go right (even with speed-step).

Yours Juergen



["timer.patch.gz" (application/x-gzip)]

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