* SSSSlllloooowwww MPC8240
@ 2001-07-09 23:57 Andrew Johnson
0 siblings, 0 replies; 3+ messages in thread
From: Andrew Johnson @ 2001-07-09 23:57 UTC (permalink / raw)
To: LinuxPPC-Embedded
Can anybody suggest why I'm seeing the following:
Under Hard Hat Linux 2.0 (2.4.2 kernel) on my MVME2100 board (MPC8240 CPU
running at 200MHz), Linux startup reports a BogoMIPS rating of 9.59. I've
just built and run the exact same calibration code under vxWorks, and here
I get a rating of 133.73 BogoMIPS, which seems much more likely to be
correct. Linux does seem rather sluggish at running things, so I don't
think it's problem with the calibration. Any ideas what could be going on
behind the scenes to slow Linux down, and how I might track it down?
I wonder whether it's related to that openpic interrupt stuff in the other
thread...
TIA,
- Andrew
--
The world is such a cheerful place when viewed from upside-down
It makes a rise of every fall, a smile of every frown
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
^ permalink raw reply [flat|nested] 3+ messages in thread
[parent not found: <002AB7E4.C21188@aps.anl.gov>]
* Re: SSSSlllloooowwww MPC8240
[not found] <002AB7E4.C21188@aps.anl.gov>
@ 2001-07-10 1:37 ` Jerry Van Baren
2001-07-10 20:47 ` Andrew Johnson
0 siblings, 1 reply; 3+ messages in thread
From: Jerry Van Baren @ 2001-07-10 1:37 UTC (permalink / raw)
To: linuxppc-embedded
Is caching enabled (both instruction and data)? It sounds a lot like
you are running without the benefit of caches. Another possibility is
that you are being swamped with interrupts, but I vaguely recall that
should not be a problem for the start up bogomips calculation.
gvb
At 06:57 PM 7/9/01 -0400, anj@aps.anl.gov wrote:
>Can anybody suggest why I'm seeing the following:
>
>Under Hard Hat Linux 2.0 (2.4.2 kernel) on my MVME2100 board (MPC8240 CPU
>running at 200MHz), Linux startup reports a BogoMIPS rating of 9.59. I've
>just built and run the exact same calibration code under vxWorks, and here
>I get a rating of 133.73 BogoMIPS, which seems much more likely to be
>correct. Linux does seem rather sluggish at running things, so I don't
>think it's problem with the calibration. Any ideas what could be going on
>behind the scenes to slow Linux down, and how I might track it down?
>
>I wonder whether it's related to that openpic interrupt stuff in the other
>thread...
>
>TIA,
>
>- Andrew
>--
>The world is such a cheerful place when viewed from upside-down
>It makes a rise of every fall, a smile of every frown
>
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: SSSSlllloooowwww MPC8240
2001-07-10 1:37 ` Jerry Van Baren
@ 2001-07-10 20:47 ` Andrew Johnson
0 siblings, 0 replies; 3+ messages in thread
From: Andrew Johnson @ 2001-07-10 20:47 UTC (permalink / raw)
To: Jerry Van Baren; +Cc: linuxppc-embedded
Jerry Van Baren wrote:
>
> Is caching enabled (both instruction and data)? It sounds a lot like
> you are running without the benefit of caches.
That was it - thanks Jerry, I now get 133.12 BogoMIPS and a much more
responsive machine.
- Andrew
--
The world is such a cheerful place when viewed from upside-down
It makes a rise of every fall, a smile of every frown
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
^ permalink raw reply [flat|nested] 3+ messages in thread
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2001-07-09 23:57 SSSSlllloooowwww MPC8240 Andrew Johnson
[not found] <002AB7E4.C21188@aps.anl.gov>
2001-07-10 1:37 ` Jerry Van Baren
2001-07-10 20:47 ` Andrew Johnson
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