Re: Question about optimum cache size.

[Lyle Seaman]

Chuck Lever <[EMAIL PROTECTED]> writes:
>    that's very interesting.  i found that increasing the size of the
>    dcache hash table larger than 500 caused degenerative hash behavior,
>    resulting in degraded performance (because the kernel spent more
>    and more time adding and searching entries in a few hash buckets
>    instead of spreading the entries over the entire table).  this is
>    also apparently true of the stat hash table.

Of course, it's a case of diminishing returns.  We made these hash
tables larger in 3.4, and LRU the hash buckets, so if you measured 3.3,
your observations may be somewhat outdated.  In the limit, you're still
correct, but the limit has moved.