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[TCP]: Turn ABC off. 

Turn Appropriate Byte Count off by default because it unfairly
penalizes applications that do small writes.  Add better documentation
to describe what it is so users will understand why they might want to
turn it on.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2006-09-13 19:51:02 -07:00 committed by David S. Miller
parent 3fcde74b38
commit b3a8a40da5
2 changed files with 10 additions and 4 deletions
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12
Documentation/networking/ip-sysctl.txt
View File

@ -102,9 +102,15 @@ inet_peer_gc_maxtime - INTEGER
TCP variables:
tcp_abc - INTEGER
Controls Appropriate Byte Count defined in RFC3465. If set to
0 then does congestion avoid once per ack. 1 is conservative
value, and 2 is more agressive.
Controls Appropriate Byte Count (ABC) defined in RFC3465.
ABC is a way of increasing congestion window (cwnd) more slowly
in response to partial acknowledgments.
Possible values are:
0 increase cwnd once per acknowledgment (no ABC)
1 increase cwnd once per acknowledgment of full sized segment
2 allow increase cwnd by two if acknowledgment is
of two segments to compensate for delayed acknowledgments.
Default: 0 (off)
tcp_syn_retries - INTEGER
Number of times initial SYNs for an active TCP connection attempt

2
net/ipv4/tcp_input.c
View File

@ -89,7 +89,7 @@ int sysctl_tcp_frto;
int sysctl_tcp_nometrics_save;
int sysctl_tcp_moderate_rcvbuf = 1;
int sysctl_tcp_abc = 1;
int sysctl_tcp_abc;
#define FLAG_DATA 0x01 /* Incoming frame contained data. */
#define FLAG_WIN_UPDATE 0x02 /* Incoming ACK was a window update. */