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From: Johannes Berg <johannes-cdvu00un1VgdHxzADdlk8Q@public.gmane.org>
To: Simon Barber <simon-vp0mx6+5gkqFX2APIN6yfw@public.gmane.org>
Cc: Thomas Pedersen <thomas-W/OLz77bvjtBDgjK7y7TUQ@public.gmane.org>,
	"radiotap-sUITvd46vNxg9hUCZPvPmw@public.gmane.org"
	<radiotap-sUITvd46vNxg9hUCZPvPmw@public.gmane.org>
Subject: Re: TSFT
Date: Sun, 18 Nov 2012 12:07:25 +0100
Message-ID: <1353236845.9649.6.camel@jlt4.sipsolutions.net> (raw)
In-Reply-To: <50A88C3D.5030809-vp0mx6+5gkqFX2APIN6yfw@public.gmane.org>

On Sat, 2012-11-17 at 23:20 -0800, Simon Barber wrote:
> Unfortunately this patch does not do a very accurate calculation, so it 
> makes the problem worse. It simply multiplies rate by the number of 
> bits to get a time. This does not take into account the limited 
> accuracy in rate (11n has fractional rates), nor does it consider the 
> rounding into blocks caused by FEC, or symbols. As a result the data is 
> made worse by the current code. Either the code should do an accurate 
> fix, or it should record the raw value and let the end user correct it 
> properly.

If we can, I'd say we should fix the calculations.

The question is how we define it when the first bit of the MPDU can be
fractional in a symbol?

johannes

  parent reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-11-17  6:26 TSFT Simon Barber
     [not found] ` <50A72E17.6070207-vp0mx6+5gkqFX2APIN6yfw@public.gmane.org>
2012-11-17  6:48   ` TSFT David Young
     [not found]     ` <20121117064848.GO21779-Gq8g4XVd89tWk0Htik3J/w@public.gmane.org>
2012-11-17  8:45       ` TSFT Johannes Berg
     [not found]         ` <1353141950.9543.3.camel-8Nb76shvtaUJvtFkdXX2HixXY32XiHfO@public.gmane.org>
2012-11-17 17:46           ` TSFT David Young
     [not found]             ` <20121117174600.GQ21779-Gq8g4XVd89tWk0Htik3J/w@public.gmane.org>
2012-11-17 18:43               ` TSFT Johannes Berg
2012-11-17 18:56               ` TSFT Guy Harris
2012-11-17 23:26   ` TSFT Thomas Pedersen
2012-11-18  7:20     ` TSFT Simon Barber
     [not found]       ` <50A88C3D.5030809-vp0mx6+5gkqFX2APIN6yfw@public.gmane.org>
2012-11-18 11:07         ` Johannes Berg [this message]
     [not found]           ` <1353236845.9649.6.camel-8Nb76shvtaUJvtFkdXX2HixXY32XiHfO@public.gmane.org>
2012-11-20 22:43             ` TSFT Simon Barber
     [not found]               ` <50AC0791.3040005-vp0mx6+5gkqFX2APIN6yfw@public.gmane.org>
2012-11-21 10:42                 ` TSFT Johannes Berg

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