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iodelay aware cycle adjustment code.

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2802
This commit is contained in:
Peter Veenstra 2007-02-04 11:10:22 +00:00
parent f28020edb3
commit 0bf5025fea
4 changed files with 58 additions and 18 deletions
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44
src/dosbox.cpp
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@ -16,7 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: dosbox.cpp,v 1.113 2007-01-21 18:14:40 c2woody Exp $ */
/* $Id: dosbox.cpp,v 1.114 2007-02-04 11:10:22 qbix79 Exp $ */
#include <stdlib.h>
#include <stdarg.h>
@ -162,19 +162,37 @@ increaseticks:
ticksRemain = 20;
}
ticksAdded = ticksRemain;
if (CPU_CycleAutoAdjust && (ticksAdded > 15 || ticksScheduled >= 250 || ticksDone >= 250) ) {
/* ratio we are aiming for is around 90% usage*/
Bits ratio = (ticksScheduled * (CPU_CyclePercUsed*90*1024/100/100)) / ticksDone;
// LOG_MSG("Done %d schedulded %d ratio %d cycles %d", ticksDone, ticksScheduled, ratio, CPU_CycleMax);
if (ratio <= 1024)
CPU_CycleMax = (CPU_CycleMax * ratio) / 1024;
else
CPU_CycleMax = 1 + (CPU_CycleMax >> 1) + (CPU_CycleMax * ratio) / 2048;
if (CPU_CycleLimit>0) {
if (CPU_CycleMax>CPU_CycleLimit) CPU_CycleMax=CPU_CycleLimit;
if (CPU_CycleAutoAdjust) {
if(ticksScheduled >= 250 || ticksDone >= 250 || (ticksAdded > 15 && ticksScheduled >= 5) ) {
/* ratio we are aiming for is around 90% usage*/
Bits ratio = (ticksScheduled * (CPU_CyclePercUsed*90*1024/100/100)) / ticksDone;
Bit32s new_cmax = CPU_CycleMax;
Bit64s cproc = (Bit64s)CPU_CycleMax * (Bit64s)ticksScheduled;
if(cproc > 0) {
double ratioremoved = (double) CPU_IODelayRemoved / (double) cproc;
if(ratioremoved < 1.0) {
ratio = (Bits)((double)ratio * (1 - ratioremoved));
if (ratio <= 1024)
new_cmax = (CPU_CycleMax * ratio) / 1024;
else
new_cmax = 1 + (CPU_CycleMax >> 1) + (CPU_CycleMax * ratio) / 2048;
}
}
// maybe care about not going negative
if (new_cmax > 0)
CPU_CycleMax = new_cmax;
if (CPU_CycleLimit > 0) {
if (CPU_CycleMax>CPU_CycleLimit) CPU_CycleMax = CPU_CycleLimit;
}
CPU_IODelayRemoved = 0;
ticksDone = 0;
ticksScheduled = 0;
} else if (ticksAdded > 15) {
CPU_CycleMax /= 3;
if (CPU_CycleMax < 100)
CPU_CycleMax = 100;
}
ticksDone = 0;
ticksScheduled = 0;
}
} else {
ticksAdded = 0;