Re: [2.6 patch] i386: always use 4k stacks

[Oliver Neukum]

Am Mittwoch, 16. November 2005 09:03 schrieb Arjan van de Ven:
> * less CPU cache footprint due to interrupt stacks
> Â Â- interrupt stacks are per cpu now instead of borrowing the per
> Â Â Âthread stack space; this both has less impact on the caches, and
> Â Â Âhas more cache hits; the per cpu stack will be in cache more than
> Â Â Âthe previously scattered bits and pieces
> * more stack space is available for interrupts compared to 2.4 kernels
> Â Â- in 2.4 kernels only 2Kb was available for interrupt context (to
> Â Â Âkeep 4K available for user context). With complex softirqs such as
> Â Â ÂPPP and firewall rules and nested interrupts this wasn't always
> Â Â Âenough. Compared to 2.6-with-8Kstacks is a bit harder; there is
> Â Â Â2Kb extra available there compared to 2.4 and arguably some of that
> Â Â Âextra is for interrupts.

This is due to having interrupt stacks. Is there any reason not to have
8K task stacks and per CPU interrupt stacks?

	Regards
		Oliver

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