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Eric Dumazet 2f970d8357 [IPV4]: rt_cache_stat can be statically defined ... Using __get_cpu_var(obj) is slightly faster than per_cpu_ptr(obj, raw_smp_processor_id()). 1) Smaller code and memory use For static and small objects, DEFINE_PER_CPU(type, object) is preferred over a alloc_percpu() : Better and smaller code to access them, and no extra memory (storing the pointer, and the percpu array of pointers) x86_64 code before patch mov 1237577(%rip),%rax # ffffffff803e5990 <rt_cache_stat> not %rax # part of per_cpu machinery mov %gs:0x3c,%edx # get cpu number movslq %edx,%rdx # extend 32 bits cpu number to 64 bits mov (%rax,%rdx,8),%rax # get the pointer for this cpu incl 0x38(%rax) x86_64 code after patch mov $per_cpu__rt_cache_stat,%rdx mov %gs:0x48,%rax # get percpu data offset incl 0x38(%rax,%rdx,1) 2) False sharing avoidance for SMP : For a small NR_CPUS, the array of per cpu pointers allocated in alloc_percpu() can be <= 32 bytes. This let slab code gives a part of a cache line. If the other part of this 64 bytes (or 128 bytes) cache line is used by a mostly written object, we can have false sharing and expensive per_cpu_ptr() operations. Size of rt_cache_stat is 64 bytes, so this patch is not a danger of a too big increase of bss (in UP mode) or static per_cpu data for SMP (PERCPU_ENOUGH_ROOM is currently 32768 bytes) Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: David S. Miller <davem@davemloft.net>		19 years ago
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ipvs	[PATCH] capable/capability.h (net/)	19 years ago
netfilter	[NETFILTER]: ip_conntrack_proto_gre.c needs linux/interrupt.h	19 years ago
Kconfig	[TCP] BIC: CUBIC window growth (2.0)	19 years ago
Makefile	[NETFILTER]: net/ipv[46]/netfilter.c cleanups	19 years ago
af_inet.c	[PATCH] capable/capability.h (net/)	19 years ago
ah4.c	[INET_SOCK]: Move struct inet_sock & helper functions to net/inet_sock.h	19 years ago
arp.c	[PATCH] capable/capability.h (net/)	19 years ago
datagram.c	[NET]: Fix sparse warnings	20 years ago
devinet.c	[PATCH] capable/capability.h (net/)	19 years ago
esp4.c	[INET_SOCK]: Move struct inet_sock & helper functions to net/inet_sock.h	19 years ago
fib_frontend.c	x86: Work around compiler code generation bug with -Os	19 years ago
fib_hash.c	[INET_SOCK]: Move struct inet_sock & helper functions to net/inet_sock.h	19 years ago
fib_lookup.h	[IPV4]: Prepare FIB core for RCU.	20 years ago
fib_rules.c	[INET_SOCK]: Move struct inet_sock & helper functions to net/inet_sock.h	19 years ago
fib_semantics.c	[INET_SOCK]: Move struct inet_sock & helper functions to net/inet_sock.h	19 years ago
fib_trie.c	[IPV4] fib_trie: build fix	19 years ago
icmp.c	[NET]: Change some "if (x) BUG();" to "BUG_ON(x);"	19 years ago
igmp.c	[NET]: Remove more unneeded typecasts on *malloc()	19 years ago
inet_connection_sock.c	[ICSK]: Move v4_addr2sockaddr from TCP to icsk	19 years ago
inet_diag.c	[INET_DIAG]: Introduce sk_diag_fill	19 years ago
inet_hashtables.c	[INET]: Generalise tcp_v4_hash_connect	19 years ago
inet_timewait_sock.c	[TWSK]: Introduce struct timewait_sock_ops	19 years ago
inetpeer.c	[NET]: Change some "if (x) BUG();" to "BUG_ON(x);"	19 years ago
ip_forward.c	[IPV4]: Remove some dead code from ip_forward()	20 years ago
ip_fragment.c	[NET]: Endian-annotate struct iphdr	19 years ago
ip_gre.c	[PATCH] capable/capability.h (net/)	19 years ago
ip_input.c	[NETFILTER]: Keep conntrack reference until IPsec policy checks are done	19 years ago
ip_options.c	[PATCH] capable/capability.h (net/)	19 years ago
ip_output.c	[IPV4]: ip_output.c needs xfrm.h	19 years ago
ip_sockglue.c	[NET]: Remove more unneeded typecasts on *malloc()	19 years ago
ipcomp.c	[INET_SOCK]: Move struct inet_sock & helper functions to net/inet_sock.h	19 years ago
ipconfig.c	[INET_SOCK]: Move struct inet_sock & helper functions to net/inet_sock.h	19 years ago
ipip.c	[PATCH] capable/capability.h (net/)	19 years ago
ipmr.c	[PATCH] capable/capability.h (net/)	19 years ago
multipath.c	Linux-2.6.12-rc2	20 years ago
multipath_drr.c	[IPV4]: possible cleanups	20 years ago
multipath_random.c	[IPV4]: Multipath modules need a license to prevent kernel tainting.	20 years ago
multipath_rr.c	[IPV4]: Multipath modules need a license to prevent kernel tainting.	20 years ago
multipath_wrandom.c	[NET]: kfree cleanup	19 years ago
netfilter.c	[NETFILTER]: net/ipv[46]/netfilter.c cleanups	19 years ago
proc.c	[INET_SOCK]: Move struct inet_sock & helper functions to net/inet_sock.h	19 years ago
protocol.c	[TCP]: Move the tcp sock states to net/tcp_states.h	20 years ago
raw.c	[NETFILTER]: Keep conntrack reference until IPsec policy checks are done	19 years ago
route.c	[IPV4]: rt_cache_stat can be statically defined	19 years ago
syncookies.c	[ICSK]: Rename struct tcp_func to struct inet_connection_sock_af_ops	19 years ago
sysctl_net_ipv4.c	[INET_SOCK]: Move struct inet_sock & helper functions to net/inet_sock.h	19 years ago
tcp.c	[IP_SOCKGLUE]: Remove most of the tcp specific calls	19 years ago
tcp_bic.c	[TCP] BIC: spelling and whitespace	19 years ago
tcp_cong.c	[TCP]: less inline's	19 years ago
tcp_cubic.c	[TCP] cubic: use Newton-Raphson	19 years ago
tcp_diag.c	[INET_DIAG]: Move the tcp_diag interface to the proper place	20 years ago
tcp_highspeed.c	[TCP]: TCP highspeed build error	19 years ago
tcp_htcp.c	[TCP]: add tcp_slow_start helper	19 years ago
tcp_hybla.c	[TCP]: fix congestion window update when using TSO deferal	19 years ago
tcp_input.c	[NET]: Change some "if (x) BUG();" to "BUG_ON(x);"	19 years ago
tcp_ipv4.c	[NETFILTER]: Keep conntrack reference until IPsec policy checks are done	19 years ago
tcp_minisocks.c	[IPV6]: Introduce inet6_timewait_sock	19 years ago
tcp_output.c	[TCP]: less inline's	19 years ago
tcp_scalable.c	[TCP]: add tcp_slow_start helper	19 years ago
tcp_timer.c	[TCP]: spelling fixes	19 years ago
tcp_vegas.c	[TCP] tcp_vegas: Fix slow start	19 years ago
tcp_westwood.c	[INET_DIAG]: Rename tcp_diag.[ch] to inet_diag.[ch]	20 years ago
udp.c	[NETFILTER]: Keep conntrack reference until IPsec policy checks are done	19 years ago
xfrm4_input.c	[IPV4/6]: Netfilter IPsec input hooks	19 years ago
xfrm4_output.c	[NETFILTER]: Redo policy lookups after NAT when neccessary	19 years ago
xfrm4_policy.c	[XFRM]: Handle DCCP in xfrm{4,6}_decode_session	19 years ago
xfrm4_state.c	[XFRM]: IPsec tunnel wildcard address support	19 years ago
xfrm4_tunnel.c	[NET]: Make ipip/ip6_tunnel independant of XFRM	20 years ago