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comparison src/core/ngx_cpuinfo.c @ 160:73e8476f9142 NGINX_0_3_27

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nginx 0.3.27 *) Change: the "variables_hash_max_size" and "variables_hash_bucket_size" directives. *) Feature: the $body_bytes_sent variable can be used not only in the "log_format" directive. *) Feature: the $ssl_protocol and $ssl_cipher variables. *) Feature: the cache line size detection for widespread CPUs at start time. *) Feature: now the "accept_mutex" directive is supported using fcntl(2) on platforms different from i386, amd64, sparc64, and ppc. *) Feature: the "lock_file" directive and the --with-lock-path=PATH autoconfiguration directive. *) Bugfix: if the HTTPS protocol was used in the "proxy_pass" directive then the requests with the body was not transferred.
author Igor Sysoev <http://sysoev.ru>
date Wed, 08 Feb 2006 00:00:00 +0300
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children fef68f68bcfd
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159:25c27e983933 160:73e8476f9142
1
2 /*
3 * Copyright (C) Igor Sysoev
4 */
5
6
7 #include <ngx_config.h>
8 #include <ngx_core.h>
9
10
11 #if (( __i386__ || __amd64__ ) && ( __GNUC__ || __INTEL_COMPILER ))
12
13
14 static ngx_inline void ngx_cpuid(uint32_t i, uint32_t *buf);
15
16
17 static ngx_inline void
18 ngx_cpuid(uint32_t i, uint32_t *buf)
19 {
20 uint32_t eax, ebx, ecx, edx;
21
22 __asm__ (
23
24 "cpuid"
25
26 : "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx) : "a" (i) );
27
28 buf[0] = eax;
29 buf[1] = ebx;
30 buf[2] = edx;
31 buf[3] = ecx;
32 }
33
34
35 /* auto detect the L2 cache line size of modern and widespread CPUs */
36
37 void
38 ngx_cpuinfo(void)
39 {
40 u_char *vendor;
41 uint32_t vbuf[5], cpu[4];
42
43 vbuf[0] = 0;
44 vbuf[1] = 0;
45 vbuf[2] = 0;
46 vbuf[3] = 0;
47 vbuf[4] = 0;
48
49 ngx_cpuid(0, vbuf);
50
51 vendor = (u_char *) &vbuf[1];
52
53 if (vbuf[0] == 0) {
54 return;
55 }
56
57 ngx_cpuid(1, cpu);
58
59 if (ngx_strcmp(vendor, "GenuineIntel") == 0) {
60
61 switch (cpu[0] & 0xf00) {
62
63 /* Pentium */
64 case 5:
65 /* Pentium Pro, II, III */
66 case 6:
67 ngx_cacheline_size = 32;
68 break;
69
70 /*
71 * Pentium 4, although its cache line size is 64 bytes,
72 * it prefetches up to two cache lines during memory read
73 */
74 case 15:
75 ngx_cacheline_size = 128;
76 break;
77 }
78
79 } else if (ngx_strcmp(vendor, "AuthenticAMD") == 0) {
80 ngx_cacheline_size = 64;
81 }
82 }
83
84 #else
85
86
87 void
88 ngx_cpuinfo(void)
89 {
90 }
91
92
93 #endif