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Re: [Qemu-devel] [PATCH] Improving timer/clock for win32

From: André Braga
Subject: Re: [Qemu-devel] [PATCH] Improving timer/clock for win32
Date: Fri, 31 Mar 2006 18:54:33 -0300

Kazu, have you tested whether this avoids the hang (and 100% CPU time
usage by QEMU, and being unable to kill the process by absolutely no
means - Process Explorer's 'kill' included - other than rebooting) on
WinXP host + kqemu and WinXP guest when opening the guests' clock
application by double-clicking it on the taskbar?


On 3/31/06, Kazu <address@hidden> wrote:
> Hi,
> This patch improves timer/clock for win32. Here is the patch and a binary.
> http://www.h7.dion.ne.jp/~qemu-win/download/qemu-20060330-timer.patch
> http://www.h6.dion.ne.jp/~kazuw/qemu-win/qemu-20060330-timer.zip
> It supports 1ms interval interrupt.
> It also improves the delay when it is used with Kqemu/Qvm86.
> A main reason of delay of time is that when main_loop_wait is slept and an
> interrupt timer is expired, the timer interrupt doesn't occured. I used an
> event object to wake up the main loop.
> I used QueryPerformanceCounter/QueryPerformanceFrequency to measure time. It
> uses ACPI PM Timer on my system. Some system use RDTSC value. It depends on
> your system.
> It might be possible to run on SMP(HT or Multi-core) system. I haven't
> tested it, though.
> Regards,
> Kazu

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