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Message-Id: <20131025.190409.1394476393722866643.davem@davemloft.net> Date: Fri, 25 Oct 2013 19:04:09 -0400 (EDT) From: David Miller <davem@...emloft.net> To: hagen@...u.net Cc: netdev@...r.kernel.org, stephen@...workplumber.org, edumazet@...gle.com, stefano.salsano@...roma2.it, fabio.ludovici@...oo.it Subject: Re: [PATCH net-next] netem: markov loss model transition fix From: Hagen Paul Pfeifer <hagen@...u.net> Date: Tue, 22 Oct 2013 23:27:06 +0200 > The transition from markov state "3 => lost packets within a burst > period" to "1 => successfully transmitted packets within a gap period" > has no *additional* loss event. The loss already happen for transition > from 1 -> 3, this additional loss will make things go wild. > > E.g. transition probabilities: > > p13: 10% > p31: 100% > > Expected: > > Ploss = p13 / (p13 + p31) > Ploss = ~9.09% > > ... but it isn't. Even worse: we get a double loss - each time. > So simple don't return true to indicate loss, rather break and return > false. > > Signed-off-by: Hagen Paul Pfeifer <hagen@...u.net> > Cc: Stephen Hemminger <stephen@...workplumber.org> > Cc: Eric Dumazet <edumazet@...gle.com> > Cc: Stefano Salsano <stefano.salsano@...roma2.it> > Cc: Fabio Ludovici <fabio.ludovici@...oo.it> > Signed-off-by: Hagen Paul Pfeifer <hagen@...u.net> Applied. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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