From mboxrd@z Thu Jan 1 00:00:00 1970 Message-Id: <4.3.2.20010709213031.00c44910@falcon.si.com> Date: Mon, 09 Jul 2001 21:37:57 -0400 To: From: Jerry Van Baren Subject: Re: SSSSlllloooowwww MPC8240 In-Reply-To: <002AB7E4.C21188@aps.anl.gov> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed Sender: owner-linuxppc-embedded@lists.linuxppc.org List-Id: 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/