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[Qemu-devel] changing simulated CPU frequency

From: Jonathan ILIAS
Subject: [Qemu-devel] changing simulated CPU frequency
Date: Tue, 31 Jan 2006 10:39:05 +0100
User-agent: Debian Thunderbird 1.0.7 (X11/20051017)


I'm trying to bypass a bug in an old version of RTAI, which does not work correctly with processors that have a clock greater than 2^31 Hz (frequency stored in a signed 32 bits integer).

As I cannot use a earlier version and fixing this bug may not be trivial, I'm looking for a way to reduce the simulated Qemu CPU clock.

I tried to change linux-user/main.c to force the use of the following version of cpu_get_real_ticks function :
static uint64_t emu_time;

int64_t cpu_get_real_ticks(void)
    return emu_time++;

But Linux in Qemu continues to detect a CPU at 3,4 GHz.

Do you know if there is a way to modify Qemu source to have a lower CPU clock ?

I hope I've described my problem clearly...
Jonathan ILIAS, assistant pédagogique
4, rue Merlet de la Boulaye
BP 30926 - 49009 ANGERS cedex 01 - FRANCE
tél : 02 41 86 67 57

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