Re: [net-next PATCH v3 3/3] net: TCP thin dupack

From: William Allen Simpson
Date: Fri Feb 12 2010 - 06:19:40 EST


Last year, I'm pretty sure I was on record as thinking this is *not* a
good idea. But at least it now requires a sysctl to turn on, and
should default to off.

Also that naming was a bit dicey. Now the names are more descriptive,
but the "force" is a bit overkill.

How about:
NET_TCP_FORCE_THIN_LINEAR_DUPACK -> NET_TCP_THIN_LINEAR_DUPACK
tcp_force_thin_dupack -> tcp_thin_linear_dupack
sysctl_tcp_force_thin_dupack -> sysctl_tcp_thin_linear_dupack


Andreas Petlund wrote:
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 28e0296..c5a73ab 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -89,6 +89,8 @@ int sysctl_tcp_frto __read_mostly = 2;
int sysctl_tcp_frto_response __read_mostly;
int sysctl_tcp_nometrics_save __read_mostly;
+int sysctl_tcp_force_thin_dupack __read_mostly;
+
int sysctl_tcp_moderate_rcvbuf __read_mostly = 1;

Where is the sysctl initialized?

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