[coyotos-dev] For your amusement

[Valerio Bellizzomi]

On 28/09/2007, at 12.29, Jonathan S. Shapiro wrote:

>On Wed, 2007-09-26 at 00:05 +0200, Jeroen Visser wrote:
>> Very, very cool. Congratulations!
>> 
>> It seems to require 6MB RAM at least now. Startup delay is significant
>> when more memory is added: 32MB => 3secs, 64MB => 6s, 256MB => 13s
>> (under QEMU at least).
>
>Yes. Actually there are two separate issues here:
>
>1. Why 6M?  I don't know, and I would like to find out. I *suspect* it
>has to do with the way that we pre-allocate page tables, but I do not
>know. Can you tell me what diagnostic appears when you attempt to boot
>with less?
>
>2. Startup delay. I suspect the root cause of this is that we are
>initializing all of object space eagerly, and that we are using
>temporary mappings to do that. The temporary mappings need to be
>invalidated fairly often, and QEMU is very slow at that. We need to
>confirm whether this is true.

On Pentium III it blocks for one second or two when "Enabling interrupts",
but after that message it is so fast that I can't read other messages
until the console text appears. Unfortunately I don't read german :-)

>
>One way to do that is to run under GDB and hit ^c a couple of times
>during that delay. Do a back-trace ("bt") and you will probably find
>that some procedure call is driving all of this. If someone can identify
>that procedure, it would be a big help.
>
>We can find it, of course, but it will take time and it isn't a top
>priority right now. If you can help us narrow the search, it becomes a
>lot easier to fix it.
>
>shap
>
>_______________________________________________
>coyotos-dev mailing list
>coyotos-dev at smtp.coyotos.org
>http://www.coyotos.org/mailman/listinfo/coyotos-dev