Date: Tue, 3 Feb 2004 11:08:11 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Robert Watson <rwatson@freebsd.org> Cc: current@freebsd.org Subject: Re: Coalescing pipe allocation Message-ID: <200402031908.i13J8BAP003708@apollo.backplane.com> References: <Pine.NEB.3.96L.1040203121006.79056G-100000@fledge.watson.org>
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:Robert N M Watson FreeBSD Core Team, TrustedBSD Projects
:robert@fledge.watson.org Senior Research Scientist, McAfee Research
It seems to me that realizing the lion's share of the benefit requires
only that you cache the KVM reservation for a pipe buffer, and that
you perhaps separately cache pipe meta data structures. I think
you would only get a smidgen more performance by caching the entire
pipe pair, so it seems a bit overkill to do that. By my quick read it
looks like it would be trivial to create a small per-cpu (UMA based for
you guys, globaldata based for me) cache. A hysteresis of 4 ought to
be sufficient.
-Matt
Matthew Dillon
<dillon@backplane.com>
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