netdev - bufferbloat on Nokia N900 (and probably anything with GPRS?)

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Message-ID: <20160804185225.GA12637@amd>
Date:	Thu, 4 Aug 2016 20:52:25 +0200
From:	Pavel Machek <pavel@....cz>
To:	pali.rohar@...il.com, sre@...nel.org,
	kernel list <linux-kernel@...r.kernel.org>,
	aaro.koskinen@....fi, ivo.g.dimitrov.75@...il.com,
	patrikbachan@...il.com, serge@...lyn.com
Cc:	netdev@...r.kernel.org
Subject: bufferbloat on Nokia N900 (and probably anything with GPRS?)

Hi!

GPRS/UMTS modem on N900 seems to have rather severe bufferbloat
problem -- after area of bad signal is encountered, pings are in 200
_seconds_ range.

I guess it would be good to reduce the queues, and probably drop
packets when signal is too low.

Any ideas how to make GPRS more usable?
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html