Re: pegasosII hung with new kernel - page daemon spinning

On 09/23/2012 10:19 AM, matthew green wrote:
>>>> That's interessting what size does the arena have on the system with
>>>> 512mb? Probably limited by NKMEMPAGES_MAX_DEFAULT, so it might need =
to
>>>> be larger on those.
>>>
>>> i noticed macppc already defines this to 256MB.  trying that now.
>>>
>>>
>>> .mrg.
>>>
>>
>> Yes, that's what I think. Having the limit at 1/3 of the kernel addres=
s
>> space size make sense.
>>
>> I don't know for sure but the kernel address space and user address
>> space on powerpc are disjunct right? So we are not really limited at a=
ll
>> like on i386.
>=20
> KVA on ppc is limited to 512MB i am told.  would you then
> recommend more like 170MB?
>=20
> this works, though there was a long long pause i thought there
> was a problem why my build was running though GCC.  that's a
> different issue, though again it was the page daemon cpu
> spinning for a long time.  i wonder if it should sleep for a
> second if it has looped more than N times in a row without=20
> entering the wait section of the loop.  for N=3D1000 maybe?
>=20
>=20
> .mrg.
>=20

ah I see we have 2 segments for the kernel, going to high here will most
likely limit the memory for uareas.
I would suggest give it a try with 200mb and see if the arenas free
memory drops below 10%.

Lars


--=20
------------------------------------

Mystische Erkl=E4rungen:
Die mystischen Erkl=E4rungen gelten f=FCr tief;
die Wahrheit ist, dass sie noch nicht einmal oberfl=E4chlich sind.

   -- Friedrich Nietzsche
   [ Die Fr=F6hliche Wissenschaft Buch 3, 126 ]