aboutsummaryrefslogtreecommitdiffstats
path: root/include/linux
diff options
context:
space:
mode:
authorAndreas Petlund <apetlund@simula.no>2010-02-18 04:48:19 +0000
committerDavid S. Miller <davem@davemloft.net>2010-02-18 15:43:09 -0800
commit7e38017557bc0b87434d184f8804cadb102bb903 (patch)
tree30c4a0793bd28f6731ade58786c06f9cf33115df /include/linux
parent36e31b0af58728071e8023cf8e20c5166b700717 (diff)
downloadmrst-s0i3-test-7e38017557bc0b87434d184f8804cadb102bb903.tar.gz
mrst-s0i3-test-7e38017557bc0b87434d184f8804cadb102bb903.tar.xz
mrst-s0i3-test-7e38017557bc0b87434d184f8804cadb102bb903.zip
net: TCP thin dupack
This patch enables fast retransmissions after one dupACK for TCP if the stream is identified as thin. This will reduce latencies for thin streams that are not able to trigger fast retransmissions due to high packet interarrival time. This mechanism is only active if enabled by iocontrol or syscontrol and the stream is identified as thin. Signed-off-by: Andreas Petlund <apetlund@simula.no> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/tcp.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 3ba8b074612..a778ee02459 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -104,6 +104,7 @@ enum {
#define TCP_MD5SIG 14 /* TCP MD5 Signature (RFC2385) */
#define TCP_COOKIE_TRANSACTIONS 15 /* TCP Cookie Transactions */
#define TCP_THIN_LINEAR_TIMEOUTS 16 /* Use linear timeouts for thin streams*/
+#define TCP_THIN_DUPACK 17 /* Fast retrans. after 1 dupack */
/* for TCP_INFO socket option */
#define TCPI_OPT_TIMESTAMPS 1
@@ -343,7 +344,8 @@ struct tcp_sock {
u8 frto_counter; /* Number of new acks after RTO */
u8 nonagle : 4,/* Disable Nagle algorithm? */
thin_lto : 1,/* Use linear timeouts for thin streams */
- unused : 3;
+ thin_dupack : 1,/* Fast retransmit on first dupack */
+ unused : 2;
/* RTT measurement */
u32 srtt; /* smoothed round trip time << 3 */