Kumara Swamy J wrote:
bcos its spends most of its time only with context swiching and there
r lot many things to be done besides context switching.
On 9/18/06, *Miguel Angel Alvarez* <ma.alvarez@xxxxxx
<mailto:ma.alvarez@xxxxxx>> wrote:
Gaurav Dhiman wrote:
> On 9/18/06, Tharindu Rukshan Bamunuarachchi <
tharindunix@xxxxxxxxx <mailto:tharindunix@xxxxxxxxx>>
> wrote:
>> I could successfully increase HZ value to 2000. After I
increased HZ
>> to 4000 and kernel freeze at follwoing point ....
>>
>> ........
>> ........
>> Total of 4 processors activated (17498.11 BogoMIPS).
>> ENABLING IO-APIC IRQs
>> ..TIMER: vector=0x31 pin1=2 pin2=-1
>
> I think, by such a high value for HZ, you are not allowing the
system
> to do anything usefull except handling timer interrupts. At this
freq,
> kernel will only keep on handling the timer interrupts and will
not be
> able to give attention to user processes, i mean non-interrupt
conext
> code, hence it gives a feeling that sytem is hung, where as
system is
> busy in handling only and only timer interrupts.
>
> regards,
> Gaurav
>
>>
>>
>> Any Idea ....???
>>
>> --
>> Tharindu Rukshan Bamunuarachchi
>> all fabrications are subject to decay
>>
>> --
>> Kernelnewbies: Help each other learn about the Linux kernel.
>> Archive: http://mail.nl.linux.org/kernelnewbies/
>> FAQ: http://kernelnewbies.org/faq/
>>
>>
>
>
Why is it that? Because if you set HZ to 4000, you are calling the
scheduler each 250 microsecs... This should be quite enough to do
context switching and scheduler calculations (which I have read
that are
at most in the range of 50 microsecs...
Miguel Ángel
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Is there any study on the time that context switching really takes... I
mean, yes... it sounds that setting HZ to 4000 seems too heavy for the
system... but also moving from 100 to 1000 was discussed years ago, and
now it seems to be the standard...
Miguel Ángel
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