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authorEric Dumazet <eric.dumazet@gmail.com>2010-03-19 05:37:18 +0000
committerDavid S. Miller <davem@davemloft.net>2010-03-21 18:31:35 -0700
commit907cdda5205b012eec7513f66713749b293188c9 (patch)
tree0488e7282c2d3748d90f8ceca78a183f905c4167 /include/linux/snmp.h
parent32a806c194ea112cfab00f558482dd97bee5e44e (diff)
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tcp: Add SNMP counter for DEFER_ACCEPT
Its currently hard to diagnose when ACK frames are dropped because an application set TCP_DEFER_ACCEPT on its listening socket. See http://bugzilla.kernel.org/show_bug.cgi?id=15507 This patch adds a SNMP value, named TCPDeferAcceptDrop netstat -s | grep TCPDeferAcceptDrop TCPDeferAcceptDrop: 0 This counter is incremented every time we drop a pure ACK frame received by a socket in SYN_RECV state because its SYNACK retrans count is lower than defer_accept value. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/snmp.h')
-rw-r--r--include/linux/snmp.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/snmp.h b/include/linux/snmp.h
index 4435d108475..d2a9aa3c6c8 100644
--- a/include/linux/snmp.h
+++ b/include/linux/snmp.h
@@ -227,6 +227,7 @@ enum
LINUX_MIB_SACKSHIFTFALLBACK,
LINUX_MIB_TCPBACKLOGDROP,
LINUX_MIB_TCPMINTTLDROP, /* RFC 5082 */
+ LINUX_MIB_TCPDEFERACCEPTDROP,
__LINUX_MIB_MAX
};