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Date: Mon, 9 Jun 2008 08:40:57 +0200 (CEST) From: Geert Uytterhoeven <geert@...ux-m68k.org> To: Luke -Jr <luke@...hjr.org> cc: "Maciej W. Rozycki" <macro@...ux-mips.org>, linux-kernel <linux-kernel@...r.kernel.org>, linux-mips@...ux-mips.org Subject: Re: bcm33xx port On Sun, 8 Jun 2008, Luke -Jr wrote: > On Sunday 08 June 2008, Maciej W. Rozycki wrote: > > On Sun, 8 Jun 2008, Luke -Jr wrote: > > > > Not exactly. Try harder -- this is simple arithmetic and you've got > > > > all the data given above already. :) > > > > > > 200 / 2? I'm not really sure what a 'jiffy' is.. > > > > Hmm, I have thought it can be inferred from the code involved or failing > > that -- Google... Well, anyway, a jiffy is a tick of the kernel timer or, > > specifically in this context and to be more precise, the interval between > > such two consecutive ticks or, in other words, 1/HZ. ^^ Look at CONFIG_HZ, which is probably 100, 250, or 1000. > jiffy = 1 / 200000 HZ = 0.000005 sec/tick > loop = 200000 instructions / 2 instructions per loop = 100000 loops/sec > > So 0.00000000005 loops per jiffy? But it can't be, since loops_per_jiffy isn't > floating point... :/ So loops_per_jiffie is approx. CPU clock frequency / CONFIG_HZ. Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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