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

[Arjan van de Ven <arjan@infradead.org>]

On Mon, 2005-11-14 at 12:11 +0100, Jens Axboe wrote:
> On Mon, Nov 14 2005, Arjan van de Ven wrote:
> > On Mon, 2005-11-14 at 11:20 +0100, Pierre Ossman wrote:
> > > Adrian Bunk wrote:
> > > > It seems most problems with 4k stacks are already resolved.
> > > > 
> > > > I'd like to see this patch to always use 4k stacks in -mm now for 
> > > > finding any remaining problems before submitting this patch for 2.6.16.
> > > > 
> > > > 
> > > 
> > > Has the block layer been remade to a serial approach? 
> > 
> > yes.
> 
> Not in mainline it hasn't.

well the patch was for -mm ;)

> 
> Are there any recent benchmarks of 4kb vs 8kb stacks?

not sure; I do know that it very much helps java (many more threads
possible) and the VM (far less order 1 allocs). In addition the 4Kb
allocation can be satisfied with the per cpu list of free 4Kb pages,
while obviously an order 1 cannot and has to go global.

>  Is anyone shipping 4kb stack kernels?

Both Fedora and RHEL are shipping this for all 2.6 based versions (eg
FC2 and all later, RHEL4)


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