From owner-freebsd-arch  Mon Feb 18 13:21:15 2002
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Date: Mon, 18 Feb 2002 13:19:52 -0800 (PST)
From: Julian Elischer <julian@elischer.org>
To: Andrew Gallatin <gallatin@cs.duke.edu>
Cc: Matthew Dillon <dillon@apollo.backplane.com>,
	Poul-Henning Kamp <phk@critter.freebsd.dk>, arch@FreeBSD.ORG,
	jhb@FreeBSD.ORG, peter@wemm.org, jake@locore.ca
Subject: Re: timing results for gettimeofday() (without any credential fixes)
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X-Loop: FreeBSD.ORG

turn off invariants to get the fast path on syscalls

On Mon, 18 Feb 2002, Andrew Gallatin wrote:

> 
> Matthew Dillon writes:
>  > CURRENT 2xCPU SMP BUILD Original gettimeofday() code
>  > 
>  >     one TG running:	350000/sec
>  >     two TGs running:	55000/sec per TG	(no, that isn't a type-o)
>  >
> <..> 
>  > STABLE 2xCPU SMP BUILD (note gettimeofday() on stable is marked MPSAFE):
>  >     one TG running:	192402/sec
>  >     two TGs running:	95900/sec
>  > 
> 
> To add 2 datapoints to that:
> 
> CURRENT 1CPU UP BUILD top-of-tree as of noon EST, no patches, no
> WITNESS, INVARIANTS:
          ^^


> 	one TG running: 145000/sec
> 
> -STABLE 1CPU UP BUILD, no patches
> 	one TG running: 625000/sec
> 
> So that's a factor of 4 slowdown for syscalls between -current and
> -stable on UP alphas...
> 
> 
> Drew
> 
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