)]}'
{
  "commit": "72a3effaf633bcae9034b7e176bdbd78d64a71db",
  "tree": "b7a331527f1b15335a358f97809134f35587e57a",
  "parents": [
    "3c62f75aac7348ee262b1295cfcfeb3473f76815"
  ],
  "author": {
    "name": "Eric Dumazet",
    "email": "dada1@cosmosbay.com",
    "time": "Thu Nov 16 02:30:37 2006 -0800"
  },
  "committer": {
    "name": "David S. Miller",
    "email": "davem@sunset.davemloft.net",
    "time": "Sat Dec 02 21:21:44 2006 -0800"
  },
  "message": "[NET]: Size listen hash tables using backlog hint\n\nWe currently allocate a fixed size (TCP_SYNQ_HSIZE\u003d512) slots hash table for\neach LISTEN socket, regardless of various parameters (listen backlog for\nexample)\n\nOn x86_64, this means order-1 allocations (might fail), even for \u0027small\u0027\nsockets, expecting few connections. On the contrary, a huge server wanting a\nbacklog of 50000 is slowed down a bit because of this fixed limit.\n\nThis patch makes the sizing of listen hash table a dynamic parameter,\ndepending of :\n- net.core.somaxconn tunable (default is 128)\n- net.ipv4.tcp_max_syn_backlog tunable (default : 256, 1024 or 128)\n- backlog value given by user application  (2nd parameter of listen())\n\nFor large allocations (bigger than PAGE_SIZE), we use vmalloc() instead of\nkmalloc().\n\nWe still limit memory allocation with the two existing tunables (somaxconn \u0026\ntcp_max_syn_backlog). So for standard setups, this patch actually reduce RAM\nusage.\n\nSigned-off-by: Eric Dumazet \u003cdada1@cosmosbay.com\u003e\nSigned-off-by: David S. Miller \u003cdavem@davemloft.net\u003e\n",
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