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Date:	Fri, 29 Jan 2010 23:15:51 +0100
From:	Damian Lukowski <>
To:	Netdev <>
Subject: [PATCH 0/3][v2] tcp: fix ICMP-RTO war

This patches fix the current RTO calculation routine, when
srtt and rttvar are zero, yielding an RTO of zero 
Under some circumstances, TCPs srtt and rttvar are zero,
yielding a calculated RTO of zero.
This is particularly unfortunate for ICMP based RTO recalculation
as introduced in f1ecd5d9e736660 (Revert Backoff [v3]: Revert RTO
on ICMP destination unreachable), as it results in RTO retransmission

Thanks to Ilpo Jarvinen for providing debug patches and to
Denys Fedoryshchenko for reporting and testing.

Signed-off-by: Damian Lukowski <>
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