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From: John Ma <kwma@avantwave.com>
To: linuxppc-embedded@lists.linuxppc.org
Subject: slow in user space?
Date: Fri, 23 May 2003 16:11:44 +0800	[thread overview]
Message-ID: <3ECDD7C0.80401@avantwave.com> (raw)


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


** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

             reply	other threads:[~2003-05-23  8:11 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-05-23  8:11 John Ma [this message]
2003-05-23 14:46 ` slow in user space? Dan Malek
2003-05-24 23:02 ` bhupinder sahran

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