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Message-ID: <Pine.LNX.4.61.0702270111200.23355@yvahk01.tjqt.qr> Date: Tue, 27 Feb 2007 01:14:00 +0100 (MET) From: Jan Engelhardt <jengelh@...ux01.gwdg.de> To: Stephen Hemminger <shemminger@...ux-foundation.org> cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org Subject: Re: [RFC] div64_64 support On Feb 26 2007 16:07, Stephen Hemminger wrote: >> On Feb 26 2007 15:44, Stephen Hemminger wrote: >> >> >- x = (2 * x + (uint32_t) div64_64(a, x*x)) / 3; >> >> >+ x = (2 * x + (u32) (a / x*x)) / 3; >> >> >> >> Previously there was div64_64(a, x*x) which is equivalent to >> >> (a)/(x*x), or just: a/(x^2). But now you do a/x*x, which is >> >> equivalent to a*x/x (in the domain of real numbers). Furthermore, >> >> a/x*x is a-(a%x), which does not even remotely match a/(x^2). >> >> >> >Been there, done that, don't want to repeat it... >> >> I am sorry I don't quite follow. > >Once before a missed paren's caused a TCP congestion window bug that >took 6 months before it was found... Hah, just as I expected. |On Tue, 27 Feb 2007 00:02:50 +0100 (MET), Jan Engelhardt wrote: |>Then our reviewers should catch it, and if not, the janitors will. Jan -- - 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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