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Article #55059

BogoMIPS

#55059
From: George Durbridge
Date: Tue, 05 Aug 1997 00:00
22 lines
1443 bytes
Does anyone know if BogoMIPS is affected by external cache ?

I added 256k cache to a m/board which previously had nil.  It was 
recognized by the bios, but the BogoMIPS was unaltered :(

It may be duff cache, or the wrong sort, but on looking closely at the 
table in the BogoMIPS HOWTO, it seemed that processors with no cache 
often returned precisely the same numbers as similar processors with, and 
that the amount of cache made no difference.  There are a few results 
marked nocache which are very low, but those are 486's running so slow 
that the internal cache must have been disabled.

It's a no-name board with a UMC chipset, running an IBM 5x86/100.  Not a 
flash board, and no doubt even slower because it's a VLB/PCI hybrid: that 
no doubt explains why the BogoMIPS number is 40 instead of 50.  But it 
hasn't been hacked to pretend it has cache when it has none.

-- 
/* George Durbridge, Melbourne, Victoria, Australia */
/* tel 61 (03) 9280 3390      fax 61 (03) 9280 3355 */
/* gdurb@melbourne.dialix.com.au                    */
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From: gdurb@melbourne.dialix.com.au (George Durbridge)
Subject: BogoMIPS
Date: 1997/08/05
Message-ID: <870784374.844363@edison.dialix.com.au>
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