Xen devel - Sep 2010 - I have a trouble with floating point number on Intel Xeon. May be a BUG.

Hello:
 
I have a trouble with floating point number when I use xen. First I work on
openSUSE 11.3, with xen-4.0.0_21091_05-6.6.x86_64. I create a windows XP domU,
and make a simple program dealing with floating point number by Visual C++ 6.
The program is:
void BUG()
{
  while(1);
}
func()
{
  float f = 1;
 
  while(1)
  {
    TRACE(“f = %f\n”, f);
    if(f < 0)
      BUG();
    Sleep(1000);
  }
}
 
When I use “xm migrate –live win1 hosta”, (hosta is the same computer), sometime
print f = -1.#IND0, sometime goto BUG(). Why()?
 
Then I use xen-4.0.1-rc6, the same thing happen. Is this a BUG of xen? 
My CPU is Intel Xeon L5408.When I use other CPU, for example Xeon L5420,I rarely
meet the problem.
 
With best regards,
libing. 
                                                                                
5    Sep   2010




  		 	   		  

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