Re: kernels and b0xen
On Thu, Jan 23, 2003 at 12:12:56PM +0100, Geert Uytterhoeven wrote:
> On Thu, 23 Jan 2003 simon@nuit.ca wrote:
> > that may be because of the smallish amount of RAM on this thing;
> > interleaved i was getting pretty much the same ratings. it may have to
> > do with the RAM sticks' actual ms speed rating - i have 4MB sticks @ 70
> > ms IIRC, and some 8MB sticks @ 60 ms.
>
> us (microseconds), I guess?
Better but not quite yet, only 3 orders of magnitude off instead of 6 ;-)
Memory access times were already counted in nanoseconds 25 years ago.
> BTW, I get 45 MB/s for the buffer-cache on my 66 MHz SDRAM.
Looks still very low, very conservative bridge timings? This means a
cache line read (32 bytes) every 700ns or so. Even if you dirty every
cache line, doubling the traffic, this means 350ns per burst transfer.
Regards,
Gabriel
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