Date: Tue, 13 Jul 1999 08:55:28 -0700 (PDT) From: Matthew Dillon <dillon@apollo.backplane.com> To: "Brian F. Feldman" <green@FreeBSD.org> Cc: Peter Jeremy <jeremyp@gsmx07.alcatel.com.au>, freebsd-current@FreeBSD.org Subject: Re: LOCK overheads (was Re: "objtrm" problem probably found) Message-ID: <199907131555.IAA78738@apollo.backplane.com> References: <Pine.BSF.4.10.9907131026080.76301-100000@janus.syracuse.net>
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:Here's another data point:
:{"/home/green"}$ cc -O2 locktests.c -o locktests
:{"/home/green"}$ ./locktests
:mode 0 10.92 ns/loop nproc=1 lcks=EMPTY
:mode 1 17.99 ns/loop nproc=1 lcks=no
:mode 2 17.97 ns/loop nproc=2 lcks=no
:mode 3 166.33 ns/loop nproc=1 lcks=yes
:mode 4 167.91 ns/loop nproc=2 lcks=yes
:mode 5 42.16 ns/loop nproc=1 lcks=no
:mode 6 41.60 ns/loop nproc=2 lcks=no
:mode 7 188.86 ns/loop nproc=1 lcks=yes
:mode 8 191.56 ns/loop nproc=2 lcks=yes
:
:This is a K6-2 350. Locks are pretty expensive on them.
:
: Brian Fundakowski Feldman _ __ ___ ____ ___ ___ ___
Wow, now that *is* expensive! The K6 must be implementing it in
microcode for it to be that bad.
-Matt
Matthew Dillon
<dillon@backplane.com>
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