netdev - tcp_reordering as 0 possible?

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Message-ID: <de0a9dcb1003150725h367d0548j35037441fdb2f5df@mail.gmail.com>
Date:	Mon, 15 Mar 2010 19:55:16 +0530
From:	raj ravi <mekaviraj@...il.com>
To:	netdev@...r.kernel.org
Subject: tcp_reordering as 0 possible?

Hi,
what is the behaviour in TCP stack if I set tcp_reordering as 0.
So , sender will  start retransmission without waiting for any duplicate ACK ?
/proc/sys/net/ipv4/tcp_reordering   - Please clarify.
The default value is 3 which means it waits until 3 duplicate ack's
arrive and then start retransmission.

"The TCP sender should use the fast retransmit algorithm to detect and
repair loss based on incoming duplicate ACKs. After the arrival of 3
duplicate ACKs (4 identical ACKs without the arrival of any other
intervening packet), TCP performs a retransmission of what appears to
be the missing segment, without waiting for the retransmission timer
to expire."

Thanks!
Kavi
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