Messages in this thread |  | | | Subject | Re: [ON TOPIC] HELP: Getting lousy memory throughput from Abit KD7 | | From | Valdis.Kletnieks@vt ... | | Date | Tue, 22 Jul 2003 15:53:50 -0400 |
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On Tue, 22 Jul 2003 15:34:51 EDT, "Richard B. Johnson" said:
> If I needed to really find the memory access time, I would write > a program to test it.
> (4) Warm the cache first by reading everything in the buffer you > are going to test.
At which point you're measuring the cache speed not the memory speed.
> You will probably be amazed at how well your system performs. This > dual CPU 400 MHz thing, with 100 MHz memory does 1,900++ MiB/sec.
Which probably explains this result. Do a quick sanity check - this number seems to indicate 20 bytes per memory clock, EVERY clock - either there's some VERY creative use of prefetching to make sure that you never hit a cache line miss, or you're measuring the cache.. ;) [unhandled content-type:application/pgp-signature] |  |