[Qemu-devel] CPU_TLB_BITS / CPU_TLB_SIZE

2007-10-04 Thread Clemens Kolbitsch 
hi everyone!
if i want to increase the size of my TLB (for emulating an i386 processor), is 
it enough to simply increase CPU_TLB_BITS (e.g. by one)??

Or are there any side effects to that I should be aware of?
Thanks!

Re: [Qemu-devel] CPU_TLB_BITS / CPU_TLB_SIZE

2007-10-04 Thread Thiemo Seufer 
Clemens Kolbitsch wrote:
 hi everyone!
 if i want to increase the size of my TLB (for emulating an i386 processor), 
 is 
 it enough to simply increase CPU_TLB_BITS (e.g. by one)??

IIRC CPU_TLB_BITS needs to be a 2^n value.


Thiemo

Re: [Qemu-devel] CPU_TLB_BITS / CPU_TLB_SIZE

2007-10-04 Thread Thiemo Seufer 
Clemens Kolbitsch wrote:
 On Thursday 04 October 2007 15:05:22 Thiemo Seufer wrote:
  Clemens Kolbitsch wrote:
   hi everyone!
   if i want to increase the size of my TLB (for emulating an i386
   processor), is it enough to simply increase CPU_TLB_BITS (e.g. by one)??
 
  IIRC CPU_TLB_BITS needs to be a 2^n value.
 
 sure that you don't confuse that with CPU_TLB_SIZE?

Oh, right, I did confuse that. :-)


Thiemo

Re: [Qemu-devel] CPU_TLB_BITS / CPU_TLB_SIZE

2007-10-04 Thread Clemens Kolbitsch 
On Thursday 04 October 2007 15:05:22 Thiemo Seufer wrote:
 Clemens Kolbitsch wrote:
  hi everyone!
  if i want to increase the size of my TLB (for emulating an i386
  processor), is it enough to simply increase CPU_TLB_BITS (e.g. by one)??

 IIRC CPU_TLB_BITS needs to be a 2^n value.

sure that you don't confuse that with CPU_TLB_SIZE?

CPU_TLB_SIZE will always be a 2^n value because of its definition

#define CPU_TLB_SIZE (1  CPU_TLB_BITS)


but honestly, I don't know (that's why i asked in the first place ;-) )

can someone back up thiemo's opinion? (or can you give me a hint on where this 
constraint is necessary?)

thanks!!