From: Angelo P. Castellani <angelo.castellani+lkml@gmail.com>
Date: Wed, 17 May 2006 04:42:11 +0000 (-0700)
Subject: [TCP]: reno sacked_out count fix
X-Git-Tag: v2.6.17-rc5~104^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8872d8e1c4311dd7e5086975df9c76120a0be83b;p=pandora-kernel.git

[TCP]: reno sacked_out count fix

From: "Angelo P. Castellani" <angelo.castellani+lkml@gmail.com>

Using NewReno, if a sk_buff is timed out and is accounted as lost_out,
it should also be removed from the sacked_out.

This is necessary because recovery using NewReno fast retransmit could
take up to a lot RTTs and the sk_buff RTO can expire without actually
being really lost.

left_out = sacked_out + lost_out
in_flight = packets_out - left_out + retrans_out

Using NewReno without this patch, on very large network losses,
left_out becames bigger than packets_out + retrans_out (!!).

For this reason unsigned integer in_flight overflows to 2^32 - something.

Signed-off-by: David S. Miller <davem@davemloft.net>
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