Date: Tue, 4 Feb 1997 23:35:27 -0800 (PST) From: asami@vader.cs.berkeley.edu (Satoshi Asami) To: skynyrd@opus.cts.cwu.edu Cc: freebsd-hardware@FreeBSD.ORG Subject: Re: (not seeing) ECC penalty on Natoma Message-ID: <199702050735.XAA25845@silvia.HIP.Berkeley.EDU> In-Reply-To: <Pine.BSF.3.95.970204192948.5753E-100000@opus.cts.cwu.edu> (message from Chris Timmons on Tue, 4 Feb 1997 19:41:31 -0800 (PST))
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* With 128MB (2x16x36) and an async /usr, i see no difference in the mw * build time between checking nothing and doing ECC. I would think that It can be either because (1) Natoma doesn't do anything when ECC is turned on (2) Natoma's ECC is as fast as non-ECC (or non-ECC is as slow as ECC) (3) Your benchmark does not exercise memory bandwidth very much I don't know how you can tell the difference between 1 and 2, but at least to see if it's 3 or not, pick up ftp://stampede.cs.berkeley.edu/pub/bcopy/bcopy-960524.tar.gz (yeah I know, haven't updated for ages) and look at the plot. (You'll need gnuplot to get a gif output.) You can see some other (old) results in http://now.cs.berkeley.edu/Td/bcopy.html Satoshi
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