zfs very poor performance compared to ufs due to lack of cache?

[Steven Hartland]

On Mon, Sep 06, 2010 at 01:54:15PM +0300, Andriy Gapon wrote:
>>> How does ufs deal with this, does it take inactive into account? Seems a bit
>>> silly for inactive pages to prevent reuse for extended periods when the
>>> memory could be better used as cache.
>> 
>> Inactive pages are also a cache, just a different kind.
> Not quite. Inactive pages may be dirty. Such pages cannot be freed or reused
> without pageout.

I assume my little test that allocates ram then frees it, which then returned
to "free" rules this out in this case though?

    Regards
    Steve

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