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DarkPlaces sys_usetimestampcounter , 1 Hz console

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Jan 14th, 2015
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  1. Index: host.c
  2. ===================================================================
  3. --- host.c  (revision 12089)
  4. +++ host.c  (working copy)
  5. @@ -671,6 +671,7 @@
  6.     double time3 = 0;
  7.     double cl_timer = 0, sv_timer = 0;
  8.     double clframetime, deltacleantime, olddirtytime, dirtytime;
  9. +   double checkconsole = 0;
  10.     double wait;
  11.     int pass1, pass2, pass3, i;
  12.     char vabuf[1024];
  13. @@ -768,7 +769,10 @@
  14.         Curl_Run();
  15.  
  16.         // check for commands typed to the host
  17. -       Host_GetConsoleCommands();
  18. +       if (realtime > checkconsole) {
  19. +           Host_GetConsoleCommands();
  20. +           checkconsole = realtime + 1;
  21. +       }
  22.  
  23.         // when a server is running we only execute console commands on server frames
  24.         // (this mainly allows frikbot .way config files to work properly by staying in sync with the server qc)
  25. Index: sys_shared.c
  26. ===================================================================
  27. --- sys_shared.c    (revision 12089)
  28. +++ sys_shared.c    (working copy)
  29. @@ -13,6 +13,9 @@
  30.  # include <windows.h>
  31.  # include <mmsystem.h> // timeGetTime
  32.  # include <time.h> // localtime
  33. +#ifdef __GNUC__
  34. +# include <x86intrin.h> // __rdtsc
  35. +#endif
  36.  #ifdef _MSC_VER
  37.  #pragma comment(lib, "winmm.lib")
  38.  #endif
  39. @@ -235,12 +238,15 @@
  40.  #ifdef WIN32
  41.  # define HAVE_TIMEGETTIME 1
  42.  # define HAVE_QUERYPERFORMANCECOUNTER 1
  43. +# define HAVE_RDTSC 1
  44.  # define HAVE_Sleep 1
  45.  #endif
  46.  
  47. +#ifndef WIN32
  48.  #if defined(CLOCK_MONOTONIC) || defined(CLOCK_HIRES)
  49.  # define HAVE_CLOCKGETTIME 1
  50.  #endif
  51. +#endif
  52.  
  53.  #ifndef WIN32
  54.  // FIXME improve this check, manpage hints to DST_NONE
  55. @@ -270,6 +276,9 @@
  56.  #if HAVE_QUERYPERFORMANCECOUNTER
  57.  static cvar_t sys_usequeryperformancecounter = {CVAR_SAVE, "sys_usequeryperformancecounter", "0", "use windows QueryPerformanceCounter timer (which has issues on multicore/multiprocessor machines and processors which are designed to conserve power) for timing rather than timeGetTime function (which has issues on some motherboards)"};
  58.  #endif
  59. +#if HAVE_RDTSC
  60. +static cvar_t sys_usetimestampcounter = {CVAR_SAVE, "sys_usetimestampcounter", "0", "use RDTSC processor instruction (which has issues on multicore/multiprocessor machines and processors which are designed to conserve power) for timing rather than timeGetTime function (which has issues on some motherboards)"};
  61. +#endif
  62.  #if HAVE_CLOCKGETTIME
  63.  static cvar_t sys_useclockgettime = {CVAR_SAVE, "sys_useclockgettime", "1", "use POSIX clock_gettime function (not adjusted by NTP on some older Linux kernels) for timing rather than gettimeofday (which has issues if the system time is stepped by ntpdate, or apparently on some Xen installations)"};
  64.  #endif
  65. @@ -290,6 +299,9 @@
  66.  #if HAVE_QUERYPERFORMANCECOUNTER
  67.     Cvar_RegisterVariable(&sys_usequeryperformancecounter);
  68.  #endif
  69. +#if HAVE_RDTSC
  70. +   Cvar_RegisterVariable(&sys_usetimestampcounter);
  71. +#endif
  72.  #if HAVE_CLOCKGETTIME
  73.     Cvar_RegisterVariable(&sys_useclockgettime);
  74.  #endif
  75. @@ -344,6 +356,38 @@
  76.         }
  77.     }
  78.  #endif
  79. +#if HAVE_RDTSC
  80. +   if (sys_usetimestampcounter.integer)
  81. +   {
  82. +       static double timescale;
  83. +      
  84. +       if (!timescale)
  85. +       {
  86. +           LONG success;
  87. +           HKEY hKey;
  88. +           DWORD regType = REG_DWORD;
  89. +           DWORD regSize = sizeof(DWORD);
  90. +           DWORD MHz;
  91. +           success = RegOpenKeyEx(HKEY_LOCAL_MACHINE, "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", 0, KEY_QUERY_VALUE, &hKey);
  92. +           if (success == ERROR_SUCCESS)
  93. +           {
  94. +               success = RegQueryValueEx(hKey, "~MHz", NULL, &regType, (LPBYTE)&MHz, &regSize);
  95. +               if (success == ERROR_SUCCESS && MHz) timescale = 1.0 / ( 1000000.0 * MHz );
  96. +               RegCloseKey(hKey);
  97. +           }
  98. +       }
  99. +       if (timescale)
  100. +       {
  101. +           return timescale * __rdtsc();
  102. +       }
  103. +       else
  104. +       {
  105. +           Con_Printf("No time stamp counter frequency available\n");
  106. +           // fall back to other clock sources
  107. +           Cvar_SetValueQuick(&sys_usetimestampcounter, false);
  108. +       }
  109. +   }
  110. +#endif
  111.  
  112.  #if HAVE_CLOCKGETTIME
  113.     if (sys_useclockgettime.integer)
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