>Cache makes your drive much slower. My Sunrise IDE:
>w/o cache: 230 kbps
>w/ cache: 50 kbps
How did you test this? By just testing disk I/O time? Well then you probably
don't understand caching: (I can hardly believe it, me explaining you
something :-) )
Cache is some memory wich holds data you'll probably need in the near
future. In the most used system, data what is read from disk is stored in
the cache. When it is needed again(!), it's already present in the cache so
the time it takes to load from disk is replaced by the (shorter) time for
accessing RAM. BUT.. to get something in the cache, BOTH disk acces time AND
memory acces time are spent. So when nothing previously used - and therefore
present in the cache - is needed again, cache is just a waste of time.
Cache doesn't make I/O faster, but reduces the times the slowest I/O is
needed. So in practice you will gain speed.
How larger the memory used for cache, how higher the chance used data is
present in the cache, so how faster disk acces becomes.
Grtz,
Siebe.
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