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authorAlexander Duyck <alexander.h.duyck@intel.com>2012-06-21 13:58:31 +0000
committerDavid S. Miller <davem@davemloft.net>2012-06-22 17:11:13 -0700
commit6648bd7e0e62c0c8c03b15e00c9e7015e232feff (patch)
treee5e1fdadea6ea51b4341017c40906e71c1913774 /kernel
parent8e27628ecf883b9e5825103e40e6f86bf8225f1a (diff)
downloadlinux-6648bd7e0e62c0c8c03b15e00c9e7015e232feff.tar.bz2
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 'kernel')
-rw-r--r--kernel/sysctl_binary.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/sysctl_binary.c b/kernel/sysctl_binary.c
index a650694883a1..6a3cf8253aae 100644
--- a/kernel/sysctl_binary.c
+++ b/kernel/sysctl_binary.c
@@ -415,6 +415,8 @@ static const struct bin_table bin_net_ipv4_table[] = {
{ CTL_INT, NET_IPV4_IPFRAG_SECRET_INTERVAL, "ipfrag_secret_interval" },
/* NET_IPV4_IPFRAG_MAX_DIST "ipfrag_max_dist" no longer used */
+ { CTL_INT, NET_IPV4_EARLY_DEMUX, "ip_early_demux" },
+
{ CTL_INT, 2088 /* NET_IPQ_QMAX */, "ip_queue_maxlen" },
/* NET_TCP_DEFAULT_WIN_SCALE unused */