From: Cruise Huang <zyziii@tom.com>
To: netdev@vger.kernel.org
Cc: David Miller <davem@davemloft.net>
Subject: a question about the "reord"
Date: Fri, 13 Jul 2007 15:26:28 +0800 [thread overview]
Message-ID: <46972924.9020605@tom.com> (raw)
Dear all:
I'm reading the code about the Congestion Control.Now I'm confused about
the variable "reord" in the function tcp_sacktag_write_queue().
The "reord" is initialized as the tp->packets_out, I think, which is a
max threshold of the reordering.
If it detect a hole or D-SACK ,set the reord to :
---> reord = min(fack_count, reord);
Finally,the code may update the reordering by:
---> tcp_update_reordering(sk, ((tp->fackets_out + 1) - reord), 0);
The questions are :
<1> What's the purpose of the "reord" ?
<2> Why use the "((tp->fackets_out + 1) - reord)" to update the reordering.
Do I need to study some more RFC about this ? If yes,please tell me
,thanks .
reply other threads:[~2007-07-13 7:57 UTC|newest]
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