Author: Robert Hyatt
Date: 23:14:35 03/18/03
Go up one level in this thread
On March 18, 2003 at 20:22:33, Jeremiah Penery wrote: >This exact discussion has taken place here at least twice before. I'm not sure >why Bob persists with his 120ns number, but no amount of convincing or data is >going to change his mind. Since you like to make such gratuitous/condescending remarks, here's some data and a challenge. I suppose I'll resort to treating you just like I have to treat Vincent, by giving _real_ data rather than ridiculous speculation. Here goes: The test: I use lm_bench, a well-known memory benchmark that is publicly available on the net. I ran it on several machines. The slowest was my PIII/750 Sony laptop, which reported a memory latency of 130 nanoseconds. I tested my dual xeon 2.8ghz with 400mhz FSB and got a memory latency of 147 nanoseconds. The fastest machine tested was a Dell 650 with dual PIV 3.06ghz xeons with a 533mhz FSB. Lmbench reported a latency of 145 nanoseconds I would assume that you could run the test yourself, and then decide whether your remark was simply stupid, or just uninformed, or something in between. But it was certainly _wrong_. As I have pointed out _many_ times. Whether you like my numbers or not doesn't matter a bit. The fact is, latency is _not_ in the sub 100nx range, _period_ for any PC being built that I have seen. Nor any other kind of computer that uses memory based on DRAM technology. Now, perhaps _you_ might try running the test before the discussion goes any further. It _might_ be eye-opening. And it might stop such ridiculous comments that are based on _nothing_ but mistaken opinion. I'll be waiting for your sub 100ns latency numbers, and sub-100 is being generous based on the comment you made, since you seem to think my 100-120 values are _too high_. I'm waiting for that "record-breaker". And LM Bench is a well-respected way to learn what goes on inside _any_ processor...
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