On Sat, 23 Oct 2004, Tom Lane wrote:

> Seems to me the overhead of any such scheme would swamp the savings from
> avoiding kernel/userspace copies ...

Well, one really can't know without testing, but memory copies are
extremely expensive if they go outside of the cache.

> the locking issues alone would be painful.

I don't see why they would be any more painful than the current locking
issues. In fact, I don't see any reason to add more locking than we
already use when updating pages.

Curt Sampson  <[EMAIL PROTECTED]>   +81 90 7737 2974   http://www.NetBSD.org
     Make up enjoying your city life...produced by BIC CAMERA

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