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ipv4: Raise tcp PMTU probe mss base size 

Quotes from RFC4821 7.2.  Selecting Initial Values

   It is RECOMMENDED that search_low be initially set to an MTU size
   that is likely to work over a very wide range of environments.  Given
   today's technologies, a value of 1024 bytes is probably safe enough.
   The initial value for search_low SHOULD be configurable.

Moreover, set a small value will introduce extra time for the search
to converge. So set the initial probe base mss size to 1024 Bytes.

Signed-off-by: Fan Du <fan.du@intel.com>
Acked-by: John Heffner <johnwheffner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Fan Du 2015-03-06 11:18:22 +08:00 committed by David S. Miller
parent aaa4e70404
commit dcd8fb8533
1 changed files with 1 additions and 1 deletions
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2
include/net/tcp.h
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@ -65,7 +65,7 @@ void tcp_time_wait(struct sock *sk, int state, int timeo);
#define TCP_MIN_MSS 88U
/* The least MTU to use for probing */
#define TCP_BASE_MSS 512
#define TCP_BASE_MSS 1024
/* After receiving this amount of duplicate ACKs fast retransmit starts. */
#define TCP_FASTRETRANS_THRESH 3