slow in user space?

[John Ma]

Hi all,
    I have a MPC8241 board and  running ppc kernel 2.4.21-pre7 on it.
Serial console is enabled and a small ramdisk is mounted as root.  The
board is running at 200M Hz.  The kernel seems to be ok during bootup
(just a few seconds).  But after the root filesystem is mounted and
/sbin/init is started, the system becomes very slow.  I need to wait
several minutes for the login console.
    My board has no rtc.  So I assume that tb_ticks_per_jiffy is equal
to be 25M/HZ (25M is the memory clock frequency).  tb_ticks_per_jiffy
will set the decrementer register which will control how long the timer
interrupt occurs.  is it correct to set this value?
    I have ever tried some smaller values for it and I found that the
speed becomes faster.  But the time on the board becomes faster also
(uptime on the board is several hours but I power on it just several
minutes).
    Does anyone have suggestions on it?

Thanks.

Best Regards
John


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