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

["André Braga" <meianoite@gmail.com>]

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?

Thanks,
A.




On 3/31/06, Kazu <kazoo@r3.dion.ne.jp> 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