Commit dcd8fb85 authored by Fan Du's avatar Fan Du Committed by David S. Miller

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: default avatarFan Du <fan.du@intel.com>
Acked-by: default avatarJohn Heffner <johnwheffner@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent aaa4e704
...@@ -65,7 +65,7 @@ void tcp_time_wait(struct sock *sk, int state, int timeo); ...@@ -65,7 +65,7 @@ void tcp_time_wait(struct sock *sk, int state, int timeo);
#define TCP_MIN_MSS 88U #define TCP_MIN_MSS 88U
/* The least MTU to use for probing */ /* 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. */ /* After receiving this amount of duplicate ACKs fast retransmit starts. */
#define TCP_FASTRETRANS_THRESH 3 #define TCP_FASTRETRANS_THRESH 3
......
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