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Lower the max ratio limit slightly. Add a new ratio limit when the cycles are sufficiently high.

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@4040
This commit is contained in:
Peter Veenstra 2017-09-02 10:12:20 +00:00
parent 8d5d05846b
commit cfe3bd2ebc
1 changed files with 8 additions and 2 deletions
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10
src/dosbox.cpp
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@ -235,10 +235,16 @@ void increaseticks() { //Make it return ticksRemain and set it in the function a
double ratioremoved = (double) CPU_IODelayRemoved / (double) cproc;
if (ratioremoved < 1.0) {
ratio = (Bit32s)((double)ratio * (1 - ratioremoved));
/* Don't allow very high ratio which can cause us to lock as we don't scale down
* for very low ratios. High ratio might result because of timing resolution */
if (ticksScheduled >= 250 && ticksDone < 10 && ratio > 20480)
ratio = 20480;
if (ticksScheduled >= 250 && ticksDone < 10 && ratio > 16384)
ratio = 16384;
// Limit the ratio even more when the cycles are already way above the realmode default.
if (ticksScheduled >= 250 && ticksDone < 10 && ratio > 5120 && CPU_CycleMax > 50000)
ratio = 5120;
if (ratio <= 1024) {
double r = 2.0 /(1.0 + 1024.0/(static_cast<double>(ratio)));
new_cmax = 1 + static_cast<Bit32s>(CPU_CycleMax * r);