team-fte
/
fteqw
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Add sys_clockprecision to see if it helps with timer precision on windows. Set to 1 if having issues. 

git-svn-id: https://svn.code.sf.net/p/fteqw/code/trunk@5806 fc73d0e0-1445-4013-8a0c-d673dee63da5
This commit is contained in:
Spoike 2021-02-15 21:43:11 +00:00
parent e26f26e170
commit df98b816ce
1 changed files with 143 additions and 91 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

234
engine/client/sys_win.c
View File

@ -48,6 +48,7 @@ __declspec(dllexport) int AmdPowerXpressRequestHighPerformance = 1; //13.35+
static void Sys_InitClock(void);
static void Sys_ClockType_Changed(cvar_t *var, char *oldval);
static void Sys_ClockPrecision_Changed(cvar_t *var, char *oldval);
#ifdef WINRT //you're going to need a different sys_ port.
qboolean isDedicated = false;
@ -1537,7 +1538,8 @@ static void QDECL Sys_Priority_Changed(cvar_t *var, char *oldval)
SetPriorityClass(h, pc);
}
static cvar_t sys_priority = CVARFCD("sys_highpriority", "0", CVAR_NOTFROMSERVER, Sys_Priority_Changed, "Controls the process priority");
static cvar_t sys_clocktype = CVARFCD("sys_clocktype", "", CVAR_NOTFROMSERVER, Sys_ClockType_Changed, "Controls which system clock to base timings from.\n0: auto\n1: timeGetTime (low precision).\n2: QueryPerformanceCounter (may drift, desync between cpu cores, or run fast with longer uptimes depending on cpu(s) and windows version).");
static cvar_t sys_clocktype = CVARFCD("sys_clocktype", "", CVAR_NOTFROMSERVER, Sys_ClockType_Changed, "Controls which system clock to base timings from.\n0: auto\n1: timeGetTime (low precision).\n2: QueryPerformanceCounter (may drift, desync between cpu cores, or run fast with longer uptimes depending on cpu(s) and windows version).\n3: QueryPerformanceCounter-with-force-affinity (shouldn't drift, but may result in less cpu time available).");
static cvar_t sys_clockprecision = CVARFCD("sys_clockprecision", "", CVAR_NOTFROMSERVER, Sys_ClockPrecision_Changed, "Attempts to control windows' interrupt interval, in milliseconds. This can cause windows to give better clock precision and shorter waits, but also more overhead from process rescheduling.");
/*
================
Sys_Init
@ -1553,6 +1555,7 @@ void Sys_Init (void)
Cvar_Register(&sys_priority, "System vars");
Cvar_Register(&sys_clocktype, "System vars");
Cvar_Register(&sys_clockprecision, "System vars");
#ifndef SERVERONLY
Cvar_Register(&sys_disableWinKeys, "System vars");
Cvar_Register(&sys_disableTaskSwitch, "System vars");
@ -1744,8 +1747,147 @@ void VARGS Sys_Printf (char *fmt, ...)
}
}
static quint64_t timer_qpc_frequency;
static unsigned int timer_tgt_period;
static quint64_t timer_basetime; //used by all clocks to bias them to starting at 0
static DWORD_PTR timer_threadaffinity;
static enum
{
CLOCK_TGT = 1,
CLOCK_QPC = 2,
CLOCK_QPC_SINGLE = 3,
} timer_clocktype;
static quint64_t Sys_GetClock(quint64_t *freq)
{
if (timer_clocktype == CLOCK_QPC || timer_clocktype == CLOCK_QPC_SINGLE)
{
static LARGE_INTEGER last;
LARGE_INTEGER pc;
QueryPerformanceCounter(&pc);
*freq = timer_qpc_frequency;
if (last.QuadPart <= pc.QuadPart) //never let it go backwards. multiple cpus are bad. ignore it till it catches up.
last.QuadPart = pc.QuadPart;
return last.QuadPart - timer_basetime;
}
else //if (timer_clocktype == CLOCK_TGT)
{
static DWORD last;
DWORD cur = timeGetTime();
if (last > cur)
{
timer_basetime -= (quint64_t)1 << 32; //if it wrapped then try to compensate with the 64bit var that we do use so that Sys_DoubleTime won't suddenly go backwards
if (host_initialized)
Con_Printf("Clock wrapped\n");
}
last = cur;
*freq = 1000;
return last - timer_basetime;
}
}
static void Sys_ClockType_Changed(cvar_t *var, char *oldval)
{
int newtype = var?var->ival:0;
if (newtype <= 0)
newtype = CLOCK_QPC;
if ((newtype == CLOCK_QPC || newtype == CLOCK_QPC_SINGLE) && !timer_qpc_frequency)
newtype = CLOCK_TGT; //QueryPerformanceCounter can fail on older versions of windows.
if (newtype != timer_clocktype)
{
quint64_t oldtime, oldfreq;
quint64_t newtime, newfreq;
oldtime = Sys_GetClock(&oldfreq);
//kill old clock's evil global settings
if (timer_clocktype == CLOCK_TGT)
timeEndPeriod(timer_tgt_period);
if (timer_clocktype == CLOCK_QPC_SINGLE) //restore it.
SetThreadAffinityMask(GetCurrentThread(), timer_threadaffinity);
//override necessary global state for new clock mode
if (newtype == CLOCK_QPC_SINGLE) //lock it down to a single core
{
DWORD_PTR old = timer_threadaffinity, sys, m;
if (!old)
{ //try and get the default/existing value....
GetProcessAffinityMask(GetCurrentProcess(), &old, &sys); //wtf? there is no thread call!
old &= sys;
}
for (m = 1; old > m; m<<=1)
; //scan to find the LAST cpu. First cpu often has overheads like interrupt handling, second is weird and unreliable (and often hyperthreads with the first).
old = SetThreadAffinityMask(GetCurrentThread(), old);
if (!timer_threadaffinity)
timer_threadaffinity = old;
}
if (newtype == CLOCK_TGT)
{
timeBeginPeriod(timer_tgt_period);
if (host_initialized && timer_tgt_period > 1)
Con_Printf(CON_WARNING"System timer is limited to only %ums precision\n", timer_tgt_period);
}
//switch over internal state
timer_clocktype = newtype;
timer_basetime = 0;
newtime = Sys_GetClock(&newfreq);
//and fix the bias to avoid crazy stalls due to offsets/frequencies changing.
timer_basetime = newtime - (newfreq * (oldtime) / oldfreq);
}
}
static void Sys_InitClock(void)
{
quint64_t freq;
TIMECAPS tc;
LARGE_INTEGER t;
//QPC timer
if (QueryPerformanceFrequency(&t))
timer_qpc_frequency = t.QuadPart;
else
timer_qpc_frequency = 0;
//TGT timer
timeGetDevCaps(&tc, sizeof(tc));
timer_tgt_period = max(1,tc.wPeriodMin); //make sure its at least 1, because 0 is probably a bug...
//calibrate it, and apply.
timer_basetime = Sys_GetClock(&freq);
Sys_ClockType_Changed(&sys_clocktype, NULL);
}
double Sys_DoubleTime (void)
{
quint64_t denum, num = Sys_GetClock(&denum);
return num / (long double)denum;
}
unsigned int Sys_Milliseconds (void)
{
quint64_t denum, num = Sys_GetClock(&denum);
num *= 1000;
return num / denum;
}
static unsigned int sys_interrupt_freq;
static void Sys_ClockPrecision_Changed(cvar_t *var, char *oldval)
{
if (sys_interrupt_freq)
timeEndPeriod(sys_interrupt_freq);
sys_interrupt_freq = 0;
if (var && var->ival > 0)
{
sys_interrupt_freq = var->ival;
if (TIMERR_NOERROR != timeBeginPeriod(sys_interrupt_freq))
Con_Printf(CON_ERROR"%s: timeBeginPeriod(%u) failed.\n", var->name, sys_interrupt_freq);
}
}
void Sys_Quit (void)
{
Sys_ClockType_Changed(NULL, NULL);
Sys_ClockPrecision_Changed(NULL, NULL);
#ifndef SERVERONLY
SetHookState(false);
@ -1770,97 +1912,7 @@ void Sys_Quit (void)
exit(1);
}
static quint64_t timer_qpc_frequency;
static unsigned int timer_tgt_period;
static quint64_t timer_basetime; //used by all clocks to bias them to starting at 0
static enum
{
CLOCK_TGT = 1,
CLOCK_QPC = 2,
} timer_clocktype;
static quint64_t Sys_GetClock(quint64_t *freq)
{
if (timer_clocktype == CLOCK_QPC)
{
static LARGE_INTEGER last;
LARGE_INTEGER pc;
QueryPerformanceCounter(&pc);
*freq = timer_qpc_frequency;
if (last.QuadPart <= pc.QuadPart) //never let it go backwards. multiple cpus are bad. ignore it till it catches up.
last.QuadPart = pc.QuadPart;
return last.QuadPart - timer_basetime;
}
else //if (timer_clocktype == CLOCK_TGT)
{
static DWORD last;
DWORD cur = timeGetTime();
if (last > cur)
timer_basetime -= (quint64_t)1 << 32; //if it wrapped then try to compensate with the 64bit var that we do use so that Sys_DoubleTime won't suddenly go backwards
last = cur;
*freq = 1000;
return last - timer_basetime;
}
}
static void Sys_ClockType_Changed(cvar_t *var, char *oldval)
{
int newtype = var?var->ival:0;
if (newtype <= 0)
newtype = CLOCK_QPC;
if (newtype == CLOCK_QPC && !timer_qpc_frequency)
newtype = CLOCK_TGT;
if (newtype != timer_clocktype)
{
quint64_t oldtime, oldfreq;
quint64_t newtime, newfreq;
oldtime = Sys_GetClock(&oldfreq);
if (timer_clocktype == CLOCK_TGT)
timeEndPeriod(timer_tgt_period);
if (newtype == CLOCK_TGT)
{
timeBeginPeriod(timer_tgt_period);
if (host_initialized && timer_tgt_period > 1)
Con_Printf(CON_WARNING"System timer is limited to only %ums precision\n", timer_tgt_period);
}
timer_clocktype = newtype;
timer_basetime = 0;
newtime = Sys_GetClock(&newfreq);
timer_basetime = newtime - (newfreq * (oldtime) / oldfreq);
}
}
static void Sys_InitClock(void)
{
quint64_t freq;
TIMECAPS tc;
LARGE_INTEGER t;
//QPC timer
if (QueryPerformanceFrequency(&t))
timer_qpc_frequency = t.QuadPart;
else
timer_qpc_frequency = 0;
//TGT timer
timeGetDevCaps(&tc, sizeof(tc));
timer_tgt_period = max(1,tc.wPeriodMin); //make sure its at least 1, because 0 is probably a bug...
//calibrate it, and apply.
timer_basetime = Sys_GetClock(&freq);
Sys_ClockType_Changed(NULL, NULL);
}
double Sys_DoubleTime (void)
{
quint64_t denum, num = Sys_GetClock(&denum);
return num / (long double)denum;
}
unsigned int Sys_Milliseconds (void)
{
quint64_t denum, num = Sys_GetClock(&denum);
num *= 1000;
return num / denum;
}
#if 0
/*
================