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authorEric Dumazet <eric.dumazet@gmail.com>2011-06-08 13:35:34 +0000
committerDavid S. Miller <davem@davemloft.net>2011-06-08 17:05:30 -0700
commit4b9d9be839fdb7dcd7ce7619a623fd9015a50cda (patch)
treebd1827203efe27578b783c30b0ff5e2d4966b26a /net/ipv4/sysctl_net_ipv4.c
parent9ad7c049f0f79c418e293b1b68cf10d68f54fcdb (diff)
downloadop-kernel-dev-4b9d9be839fdb7dcd7ce7619a623fd9015a50cda.zip
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inetpeer: remove unused list
Andi Kleen and Tim Chen reported huge contention on inetpeer unused_peers.lock, on memcached workload on a 40 core machine, with disabled route cache. It appears we constantly flip peers refcnt between 0 and 1 values, and we must insert/remove peers from unused_peers.list, holding a contended spinlock. Remove this list completely and perform a garbage collection on-the-fly, at lookup time, using the expired nodes we met during the tree traversal. This removes a lot of code, makes locking more standard, and obsoletes two sysctls (inet_peer_gc_mintime and inet_peer_gc_maxtime). This also removes two pointers in inet_peer structure. There is still a false sharing effect because refcnt is in first cache line of object [were the links and keys used by lookups are located], we might move it at the end of inet_peer structure to let this first cache line mostly read by cpus. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> CC: Andi Kleen <andi@firstfloor.org> CC: Tim Chen <tim.c.chen@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/sysctl_net_ipv4.c')
-rw-r--r--net/ipv4/sysctl_net_ipv4.c14
1 files changed, 0 insertions, 14 deletions
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 57d0752..69fd720 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -398,20 +398,6 @@ static struct ctl_table ipv4_table[] = {
.proc_handler = proc_dointvec_jiffies,
},
{
- .procname = "inet_peer_gc_mintime",
- .data = &inet_peer_gc_mintime,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_jiffies,
- },
- {
- .procname = "inet_peer_gc_maxtime",
- .data = &inet_peer_gc_maxtime,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_jiffies,
- },
- {
.procname = "tcp_orphan_retries",
.data = &sysctl_tcp_orphan_retries,
.maxlen = sizeof(int),
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