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authorHagen Paul Pfeifer <hagen@jauu.net>2013-10-22 23:27:06 +0200
committerDavid S. Miller <davem@davemloft.net>2013-10-25 19:03:39 -0400
commit4a3ad7b3eade08ad1c760aaa4fe06a36f2584939 (patch)
tree0006fbd7b270176d09bd80e6c7095e380c693571 /net/core/dev.c
parentb45bd46decd947eaa3497699d450e0851d247534 (diff)
netem: markov loss model transition fix
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@jauu.net> Cc: Stephen Hemminger <stephen@networkplumber.org> Cc: Eric Dumazet <edumazet@google.com> Cc: Stefano Salsano <stefano.salsano@uniroma2.it> Cc: Fabio Ludovici <fabio.ludovici@yahoo.it> Signed-off-by: Hagen Paul Pfeifer <hagen@jauu.net> Signed-off-by: David S. Miller <davem@davemloft.net>
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