DOSEmu on SMP systems.

DOSEmu on SMP systems.

[Sergey Suleymanov]

       I have Tyan Athlon MP platform with Linux kernel 2.4.21. Dosemu
       eats ~30 %CPU time in a plain DOS command prompt. Playing with
       config.hogthreshold multipliers in int.c, int16.c and
       *_IDLE_USECS values gives nothing. rdtsc is disabled.

       Are there any DOSEMU's idling tuning issues on SMP systems? 

-- 
  Sergey Suleymanov

Re: DOSEmu on SMP systems.

[Stas Sergeev]

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Hello.

Sergey Suleymanov wrote:
> I have Tyan Athlon MP platform with Linux kernel 2.4.21. Dosemu 
> eats ~30 %CPU time in a plain DOS command prompt. Playing with 
> config.hogthreshold multipliers in int.c, int16.c and *_IDLE_USECS
> values gives nothing.
Not sure about an SMP, but the $_hogthreshold
doesn't work reliably for me without the
attached patch. See if probably it helps you.

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--- int16.c.old	Mon Jun 23 04:02:08 2003
+++ int16.c	Tue Aug 26 21:02:31 2003
@@ -116,7 +116,6 @@
 static unsigned check_key_available(int extended)
 {
   unsigned keyptr = get_key(extended);
-  static Bit32u oldESP;
   static int trigger = 0, trigger1 = 0;
   
   if(keyptr == -1 && config.hogthreshold && CAN_SLEEP()) {
@@ -125,17 +124,12 @@
     else
       trigger1=0;
     if(trigger1 >= config.hogthreshold*500) {
-      if(oldESP==_ESP) {
-        if (++trigger >= config.hogthreshold*20) {
-          usleep(INT2F_IDLE_USECS);
-          trigger=0;
-          keyptr = get_key(extended);
-        }
-      } else {
+      if (++trigger >= config.hogthreshold*20) {
+        usleep(INT2F_IDLE_USECS);
         trigger=0;
+        keyptr = get_key(extended);
       }
       trigger1--;
-      oldESP=_ESP;
     }
   }
   return get_key(extended);

Re: DOSEmu on SMP systems.

[Sergey Suleymanov]

>>>>> Stas Sergeev writes:

 Stas> Not sure about an SMP, but the $_hogthreshold doesn't work
 Stas> reliably for me without the attached patch. See if probably it
 Stas> helps you.

       :( No. On a single Athlon with the same kernel version idling
       works quite well. 

       I think I need to try run dosemu with uniprocessor kernel.

-- 
  Sergey Suleymanov

Re: DOSEmu on SMP systems.

[Sergey Suleymanov]

       It seems the problem (if it is) was in kernel module
       amd76x_pm. :(

-- 
  Sergey Suleymanov