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dddb64bcb3
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>
80 lines
2.3 KiB
C
80 lines
2.3 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* INET protocol dispatch tables.
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*
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* Authors: Ross Biro
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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*
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* Fixes:
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* Alan Cox : Ahah! udp icmp errors don't work because
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* udp_err is never called!
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* Alan Cox : Added new fields for init and ready for
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* proper fragmentation (_NO_ 4K limits!)
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* Richard Colella : Hang on hash collision
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* Vince Laviano : Modified inet_del_protocol() to correctly
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* maintain copy bit.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/cache.h>
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/spinlock.h>
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#include <net/protocol.h>
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struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS] __read_mostly;
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const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS] __read_mostly;
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EXPORT_SYMBOL(inet_offloads);
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int inet_add_protocol(const struct net_protocol *prot, unsigned char protocol)
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{
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if (!prot->netns_ok) {
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pr_err("Protocol %u is not namespace aware, cannot register.\n",
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protocol);
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return -EINVAL;
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}
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return !cmpxchg((const struct net_protocol **)&inet_protos[protocol],
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NULL, prot) ? 0 : -1;
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}
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EXPORT_SYMBOL(inet_add_protocol);
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int inet_add_offload(const struct net_offload *prot, unsigned char protocol)
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{
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return !cmpxchg((const struct net_offload **)&inet_offloads[protocol],
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NULL, prot) ? 0 : -1;
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}
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EXPORT_SYMBOL(inet_add_offload);
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int inet_del_protocol(const struct net_protocol *prot, unsigned char protocol)
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{
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int ret;
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ret = (cmpxchg((const struct net_protocol **)&inet_protos[protocol],
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prot, NULL) == prot) ? 0 : -1;
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synchronize_net();
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return ret;
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}
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EXPORT_SYMBOL(inet_del_protocol);
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int inet_del_offload(const struct net_offload *prot, unsigned char protocol)
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{
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int ret;
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ret = (cmpxchg((const struct net_offload **)&inet_offloads[protocol],
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prot, NULL) == prot) ? 0 : -1;
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synchronize_net();
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return ret;
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}
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EXPORT_SYMBOL(inet_del_offload);
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