From owner-freebsd-current  Mon Feb 25  6:38:37 2002
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Date: Mon, 25 Feb 2002 06:38:06 -0800
From: Terry Lambert <tlambert2@mindspring.com>
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To: Matthew Dillon <dillon@apollo.backplane.com>
Cc: Jake Burkholder <jake@locore.ca>, Bruce Evans <bde@zeta.org.au>,
	Alfred Perlstein <alfred@FreeBSD.ORG>,
	Bosko Milekic <bmilekic@unixdaemons.com>,
	Seigo Tanimura <tanimura@r.dl.itc.u-tokyo.ac.jp>,
	current@FreeBSD.ORG, John Baldwin <jhb@FreeBSD.ORG>
Subject: Re: critical_enter()/critical_exit() overheads in an SMP system
References: <20020224131027.I31343-100000@gamplex.bde.org> <200202241912.g1OJCMx95238@apollo.backplane.com> <20020224224927.D35990@locore.ca>   <200202250603.g1P63fu46331@apollo.backplane.com> <200202250649.g1P6nF746587@apollo.backplane.com>
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Matthew Dillon wrote:
> :pid 214 guid/sec 687816                Two TU's running, old critical_*()
> :pid 214 guid/sec 687632                1.454 uS/call
> :pid 214 guid/sec 687857
> :pid 214 guid/sec 687887
> :pid 214 guid/sec 667454                new critical_*()
> :pid 214 guid/sec 667562                1.496 uS/call           --> 41 nS
> :pid 214 guid/sec 668551
> :pid 214 guid/sec 668686
> :pid 214 guid/sec 668789
> 
>     Boy, I'm batting 0 tonight!  Those numbers are reversed :-).
>     new_critical is the top number (the faster 1.454 uS/call) and
>     old_critical is the bottom number (1.496 uS/call).

I'll have to remember this trick of swapping numbers the
next time I have a competitive benchmark that's slower
than the competition.  8-) 8-).

-- Terry

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