diff options
| author | Alexander Duyck <alexander.h.duyck@intel.com> | 2012-06-21 13:58:31 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-06-22 17:11:13 -0700 |
| commit | 6648bd7e0e62c0c8c03b15e00c9e7015e232feff (patch) | |
| tree | e5e1fdadea6ea51b4341017c40906e71c1913774 /include | |
| parent | 8e27628ecf883b9e5825103e40e6f86bf8225f1a (diff) | |
ipv4: Add sysctl knob to control early socket demux
This change is meant to add a control for disabling early socket demux.
The main motivation behind this patch is to provide an option to disable
the feature as it adds an additional cost to routing that reduces overall
throughput by up to 5%. For example one of my systems went from 12.1Mpps
to 11.6 after the early socket demux was added. It looks like the reason
for the regression is that we are now having to perform two lookups, first
the one for an established socket, and then the one for the routing table.
By adding this patch and toggling the value for ip_early_demux to 0 I am
able to get back to the 12.1Mpps I was previously seeing.
[ Move local variables in ip_rcv_finish() down into the basic
block in which they are actually used. -DaveM ]
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/sysctl.h | 1 | ||||
| -rw-r--r-- | include/net/ip.h | 3 |
2 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h index c34b4c82b0d..20825e5f433 100644 --- a/include/linux/sysctl.h +++ b/include/linux/sysctl.h @@ -425,6 +425,7 @@ enum NET_TCP_ALLOWED_CONG_CONTROL=123, NET_TCP_MAX_SSTHRESH=124, NET_TCP_FRTO_RESPONSE=125, + NET_IPV4_EARLY_DEMUX=126, }; enum { diff --git a/include/net/ip.h b/include/net/ip.h index 83e0619f59d..50841bd6f10 100644 --- a/include/net/ip.h +++ b/include/net/ip.h @@ -210,6 +210,9 @@ extern int inet_peer_threshold; extern int inet_peer_minttl; extern int inet_peer_maxttl; +/* From ip_input.c */ +extern int sysctl_ip_early_demux; + /* From ip_output.c */ extern int sysctl_ip_dynaddr; |