lws+ says:
< 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 your observations may be somewhat outdated.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.
i measured 3.4 and 3.4a about a year and a half ago. the limit was
about 7,500 stat entries.
--
Chuck Lever - [EMAIL PROTECTED]
U-M ITD Login service team
