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Date: Tue, 18 Feb 2003 21:05:16 -0800 (PST)
From: Matthew Dillon <dillon@apollo.backplane.com>
Message-Id: <200302190505.h1J55GXt001040@apollo.backplane.com>
To: David Schultz <dschultz@uclink.Berkeley.EDU>
Cc: Bosko Milekic <bmilekic@unixdaemons.com>,
	Andrew Gallatin <gallatin@cs.duke.edu>, freebsd-arch@FreeBSD.ORG
Subject: Re: mb_alloc cache balancer / garbage collector
References: <20030216213552.A63109@unixdaemons.com> <15952.62746.260872.18687@grasshopper.cs.duke.edu> <20030217095842.D64558@unixdaemons.com> <200302171742.h1HHgSOq097182@apollo.backplane.com> <20030218055438.GA10838@HAL9000.homeunix.com>
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:To give you an idea of how big Solaris' per-CPU caches are, the
:ranges are described in the following table from
:_Solaris_Internals_.  As I mentioned, they are occasionally
:adjusted within these ranges.  Keep in mind that this is for a
:generic memory allocator, though, and not an mbuf allocator.
:
:Object Size Range	Min PCPU Cache Size	Max PCPU Cache Size
:0-63			15			143
:64-127			7			95
:128-255			3			47
:256-511			1			31
:512-1023		1			15
:1024-2047		1			7
:2048-16383		1			3
:16384-			1			1

    Interesting.  They are using fairly low object counts,
    which is what I would expect since the only real goal is
    to minimize global contention.  It doesn't take much
    to reap the benefit.

					-Matt
					Matthew Dillon 
					<dillon@backplane.com>

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