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| author | subashab@codeaurora.org <subashab@codeaurora.org> | 2017-03-23 22:34:16 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-03-24 23:17:07 +0300 |
| commit | dddb64bcb34615bf48a2c9cb9881eb76795cc5c5 (patch) | |
| tree | dff7f083a71c3016dd2d09c0f9fac18546e9eddf /net/ipv4/af_inet.c | |
| parent | 8fa96e3bf6c04af61fc0a32ad64d648322c4d29d (diff) | |
| download | linux-dddb64bcb34615bf48a2c9cb9881eb76795cc5c5.tar.xz | |
net: Add sysctl to toggle early demux for tcp and udp
Certain system process significant unconnected UDP workload.
It would be preferrable to disable UDP early demux for those systems
and enable it for TCP only.
By disabling UDP demux, we see these slight gains on an ARM64 system-
782 -> 788Mbps unconnected single stream UDPv4
633 -> 654Mbps unconnected UDPv4 different sources
The performance impact can change based on CPU architecure and cache
sizes. There will not much difference seen if entire UDP hash table
is in cache.
Both sysctls are enabled by default to preserve existing behavior.
v1->v2: Change function pointer instead of adding conditional as
suggested by Stephen.
v2->v3: Read once in callers to avoid issues due to compiler
optimizations. Also update commit message with the tests.
v3->v4: Store and use read once result instead of querying pointer
again incorrectly.
v4->v5: Refactor to avoid errors due to compilation with IPV6={m,n}
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
Suggested-by: Eric Dumazet <edumazet@google.com>
Cc: Stephen Hemminger <stephen@networkplumber.org>
Cc: Tom Herbert <tom@herbertland.com>
Cc: David Miller <davem@davemloft.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/af_inet.c')
| -rw-r--r-- | net/ipv4/af_inet.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c index 6b1fc6e4278e..d1a11707a126 100644 --- a/net/ipv4/af_inet.c +++ b/net/ipv4/af_inet.c @@ -1599,8 +1599,9 @@ static const struct net_protocol igmp_protocol = { }; #endif -static const struct net_protocol tcp_protocol = { +static struct net_protocol tcp_protocol = { .early_demux = tcp_v4_early_demux, + .early_demux_handler = tcp_v4_early_demux, .handler = tcp_v4_rcv, .err_handler = tcp_v4_err, .no_policy = 1, @@ -1608,8 +1609,9 @@ static const struct net_protocol tcp_protocol = { .icmp_strict_tag_validation = 1, }; -static const struct net_protocol udp_protocol = { +static struct net_protocol udp_protocol = { .early_demux = udp_v4_early_demux, + .early_demux_handler = udp_v4_early_demux, .handler = udp_rcv, .err_handler = udp_err, .no_policy = 1, @@ -1720,6 +1722,8 @@ static __net_init int inet_init_net(struct net *net) net->ipv4.sysctl_ip_default_ttl = IPDEFTTL; net->ipv4.sysctl_ip_dynaddr = 0; net->ipv4.sysctl_ip_early_demux = 1; + net->ipv4.sysctl_udp_early_demux = 1; + net->ipv4.sysctl_tcp_early_demux = 1; #ifdef CONFIG_SYSCTL net->ipv4.sysctl_ip_prot_sock = PROT_SOCK; #endif |