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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 /include/net/netns | |
| 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 'include/net/netns')
| -rw-r--r-- | include/net/netns/ipv4.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h index a0e89190a3e9..cd686c4fb32d 100644 --- a/include/net/netns/ipv4.h +++ b/include/net/netns/ipv4.h @@ -95,6 +95,8 @@ struct netns_ipv4 { /* Shall we try to damage output packets if routing dev changes? */ int sysctl_ip_dynaddr; int sysctl_ip_early_demux; + int sysctl_tcp_early_demux; + int sysctl_udp_early_demux; int sysctl_fwmark_reflect; int sysctl_tcp_fwmark_accept; |