From: Sven Eckelmann <sven@narfation.org>
To: b.a.t.m.a.n@lists.open-mesh.org
Cc: "Linus Lüssing" <linus.luessing@c0d3.blue>,
"Marek Lindner" <mareklindner@neomailbox.ch>
Subject: Re: [B.A.T.M.A.N.] [PATCH v2 6/7] batman-adv: ELP - use tp meter to estimate the throughput if otherwise not available
Date: Mon, 21 May 2018 19:51:49 +0200 [thread overview]
Message-ID: <1559212.ar4OgO3PtD@sven-edge> (raw)
In-Reply-To: <20180521131711.GK7162@otheros>
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On Montag, 21. Mai 2018 15:17:11 CEST Linus Lüssing wrote:
> What is the advantage of using the ilog2 and shift operator here
> compared to plain multiplications and divisions?
They most likely ran into the problem that they must do a 64 bit division
(which cannot be done on 32 bit machines in the kernel directly with C's
native "x / y" statement ). But in this case, it is most likely a lot better
to use do_div (or similar function) to avoid a lot of rounding problems which
this shift approach has.
Kind regards,
Sven
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next prev parent reply other threads:[~2018-05-21 17:51 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-18 1:47 [B.A.T.M.A.N.] [PATCH v2 0/7] B.A.T.M.A.N. V - fallback to tp meter estimation if throughput otherwise not available Marek Lindner
2018-05-18 1:47 ` [B.A.T.M.A.N.] [PATCH v2 1/7] batman-adv: tp_meter - prevent concurrent tp_meter sessions by using workqueue Marek Lindner
2018-08-29 6:56 ` Sven Eckelmann
2018-05-18 1:47 ` [B.A.T.M.A.N.] [PATCH v2 2/7] batman-adv: tp_meter - don't check for existing session Marek Lindner
2018-05-18 1:47 ` [B.A.T.M.A.N.] [PATCH v2 3/7] batman-adv: tp_meter - allow up to 10 queued sessions Marek Lindner
2018-05-18 1:47 ` [B.A.T.M.A.N.] [PATCH v2 4/7] batman-adv: tp_meter - add caller distinction Marek Lindner
2018-05-18 1:47 ` [B.A.T.M.A.N.] [PATCH v2 5/7] batman-adv: tp_meter - add option to perform one-hop test Marek Lindner
2018-05-18 1:47 ` [B.A.T.M.A.N.] [PATCH v2 6/7] batman-adv: ELP - use tp meter to estimate the throughput if otherwise not available Marek Lindner
2018-05-21 13:17 ` Linus Lüssing
2018-05-21 17:51 ` Sven Eckelmann [this message]
2018-05-21 19:06 ` Sven Eckelmann
2018-08-04 9:31 ` Antonio Quartulli
2018-05-21 14:43 ` Linus Lüssing
2018-08-04 9:35 ` Marek Lindner
2018-05-21 14:48 ` Linus Lüssing
2018-08-04 9:39 ` Antonio Quartulli
2018-05-21 15:01 ` Linus Lüssing
2018-08-04 8:59 ` Antonio Quartulli
2018-05-21 16:36 ` Sven Eckelmann
2018-05-18 1:47 ` [B.A.T.M.A.N.] [PATCH v2 7/7] batman-adv: ELP - add throughput meter test duration attribute Marek Lindner
2018-05-21 13:46 ` Linus Lüssing
2018-05-21 13:57 ` Linus Lüssing
2018-08-04 9:05 ` Marek Lindner
2018-05-21 14:34 ` Sven Eckelmann
2018-08-04 8:41 ` Antonio Quartulli
2018-08-04 9:02 ` Sven Eckelmann
2018-08-04 9:08 ` Antonio Quartulli
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