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) Message-ID: <Pine.BSF.4.21.0202181318501.52663-100000@InterJet.elischer.org> In-Reply-To: <15473.27469.127329.884265@grasshopper.cs.duke.edu>
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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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