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Bug 23302 - MBX: dhrystone performance
MBX: dhrystone performance
Product: eCos
Classification: Retired
Component: HAL (Show other bugs)
i386 Linux
medium Severity low
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Assigned To: ecc-bugs-int
Depends On:
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Reported: 2001-01-04 09:21 EST by Jesper Skov
Modified: 2007-04-18 12:30 EDT (History)
0 users

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2002-01-24 07:31:31 EST
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Description Jesper Skov 2001-01-04 09:21:38 EST
Way back when, I ran dhrystone tests on both eCos and Linux on the 
same MBX board. The  version on Linux ran quite a bit faster. Possibly
missing some board initialization magic in the HAL.
Comment 1 George Thomas 2002-01-24 07:31:25 EST
I just noticed that the performance of the MBX board when running from RAM is
less than 50% of what it is when run from ROM.  This is most likely a RAM vs.
ROM hardware configuration problem (the RAM is DRAM which runs via a complicated
setup).  Fix this anomaly and you'll probably fix the Dhrystone performance
problem as well.
Comment 2 George Thomas 2002-04-11 13:23:44 EDT
The caches were not being set up properly, certainly not for RAM based
applications.  This has been fixed and the Dhrystone benchmark now runs more
than 4 times faster than before.

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