From dca145ffaa8d39ea1904491ac81b92b7049372c0 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Mon, 27 Oct 2014 21:45:24 -0700 Subject: tcp: allow for bigger reordering level While testing upcoming Yaogong patch (converting out of order queue into an RB tree), I hit the max reordering level of linux TCP stack. Reordering level was limited to 127 for no good reason, and some network setups [1] can easily reach this limit and get limited throughput. Allow a new max limit of 300, and add a sysctl to allow admins to even allow bigger (or lower) values if needed. [1] Aggregation of links, per packet load balancing, fabrics not doing deep packet inspections, alternative TCP congestion modules... Signed-off-by: Eric Dumazet Cc: Yaogong Wang Signed-off-by: David S. Miller --- include/net/tcp.h | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) (limited to 'include/net/tcp.h') diff --git a/include/net/tcp.h b/include/net/tcp.h index c73fc145ee45..3a35b1500359 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -70,9 +70,6 @@ void tcp_time_wait(struct sock *sk, int state, int timeo); /* After receiving this amount of duplicate ACKs fast retransmit starts. */ #define TCP_FASTRETRANS_THRESH 3 -/* Maximal reordering. */ -#define TCP_MAX_REORDERING 127 - /* Maximal number of ACKs sent quickly to accelerate slow-start. */ #define TCP_MAX_QUICKACKS 16U @@ -252,6 +249,7 @@ extern int sysctl_tcp_abort_on_overflow; extern int sysctl_tcp_max_orphans; extern int sysctl_tcp_fack; extern int sysctl_tcp_reordering; +extern int sysctl_tcp_max_reordering; extern int sysctl_tcp_dsack; extern long sysctl_tcp_mem[3]; extern int sysctl_tcp_wmem[3]; -- cgit 1.4.1