Mercurial > hg > nginx-quic
annotate src/core/ngx_crc32.c @ 5885:5a042519bfe7
Upstream: limited next_upstream time and tries when resolving DNS.
When got multiple upstream IP addresses using DNS resolving, the number of
upstreams tries and the maxinum time spent for these tries were not affected.
This patch fixed it.
author | Gu Feng <flygoast@126.com> |
---|---|
date | Mon, 27 Oct 2014 19:52:03 +0800 |
parents | d620f497c50f |
children |
rev | line source |
---|---|
790 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4412 | 4 * Copyright (C) Nginx, Inc. |
790 | 5 */ |
6 | |
7 | |
8 #include <ngx_config.h> | |
9 #include <ngx_core.h> | |
10 | |
11 | |
12 /* | |
793
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
13 * The code and lookup tables are based on the algorithm |
790 | 14 * described at http://www.w3.org/TR/PNG/ |
793
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
15 * |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
16 * The 256 element lookup table takes 1024 bytes, and it may be completely |
1021 | 17 * cached after processing about 30-60 bytes of data. So for short data |
793
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
18 * we use the 16 element lookup table that takes only 64 bytes and align it |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
19 * to CPU cache line size. Of course, the small table adds code inside |
1021 | 20 * CRC32 loop, but the cache misses overhead is bigger than overhead of |
21 * the additional code. For example, ngx_crc32_short() of 16 bytes of data | |
793
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
22 * takes half as much CPU clocks than ngx_crc32_long(). |
790 | 23 */ |
24 | |
25 | |
793
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
26 static uint32_t ngx_crc32_table16[] = { |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
27 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
28 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
29 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
30 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
31 }; |
790 | 32 |
793
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
33 |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
34 uint32_t ngx_crc32_table256[] = { |
790 | 35 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, |
36 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, | |
37 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, | |
38 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, | |
39 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, | |
40 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, | |
41 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, | |
42 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, | |
43 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, | |
44 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, | |
45 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, | |
46 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, | |
47 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, | |
48 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, | |
49 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, | |
50 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, | |
51 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, | |
52 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, | |
53 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, | |
54 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, | |
55 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, | |
56 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, | |
57 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, | |
58 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, | |
59 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, | |
60 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, | |
61 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, | |
62 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, | |
63 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, | |
64 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, | |
65 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, | |
66 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, | |
67 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, | |
68 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, | |
69 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, | |
70 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, | |
71 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, | |
72 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, | |
73 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, | |
74 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, | |
75 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, | |
76 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, | |
77 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, | |
78 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, | |
79 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, | |
80 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, | |
81 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, | |
82 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, | |
83 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, | |
84 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, | |
85 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, | |
86 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, | |
87 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, | |
88 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, | |
89 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, | |
90 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, | |
91 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, | |
92 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, | |
93 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, | |
94 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, | |
95 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, | |
96 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, | |
97 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, | |
98 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d | |
99 }; | |
793
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
100 |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
101 |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
102 uint32_t *ngx_crc32_table_short = ngx_crc32_table16; |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
103 |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
104 |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
105 ngx_int_t |
1694
8c696afe46b3
rename ngx_crc32_init() to ngx_crc32_table_init()
Igor Sysoev <igor@sysoev.ru>
parents:
1021
diff
changeset
|
106 ngx_crc32_table_init(void) |
793
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
107 { |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
108 void *p; |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
109 |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
110 if (((uintptr_t) ngx_crc32_table_short |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
111 & ~((uintptr_t) ngx_cacheline_size - 1)) |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
112 == (uintptr_t) ngx_crc32_table_short) |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
113 { |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
114 return NGX_OK; |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
115 } |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
116 |
930
45df22906c12
allocate aligned ngx_crc32_table_short globally
Igor Sysoev <igor@sysoev.ru>
parents:
793
diff
changeset
|
117 p = ngx_alloc(16 * sizeof(uint32_t) + ngx_cacheline_size, ngx_cycle->log); |
793
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
118 if (p == NULL) { |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
119 return NGX_ERROR; |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
120 } |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
121 |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
122 p = ngx_align_ptr(p, ngx_cacheline_size); |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
123 |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
124 ngx_memcpy(p, ngx_crc32_table16, 16 * sizeof(uint32_t)); |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
125 |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
126 ngx_crc32_table_short = p; |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
127 |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
128 return NGX_OK; |
8d39da951bbd
split ngx_crc32() to short and long version
Igor Sysoev <igor@sysoev.ru>
parents:
791
diff
changeset
|
129 } |