Messages in this thread | | | Date | Mon, 14 Nov 2005 12:24:03 +0100 | From | Jens Axboe <> | Subject | Re: [2.6 patch] i386: always use 4k stacks |
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On Mon, Nov 14 2005, Arjan van de Ven wrote: > 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 ;)
ok :)
> > > > 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.
I realize it has nice advantages in theory, just wondering if anyone has done a performance analysis of 4kb vs 8kb stacks lately (or at all?).
> > 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)
Cool, that's the kind of testing coverage I was hoping for.
-- Jens Axboe
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