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Re: [PATCH] Link breaks for large NR_CPUS



On Wed, Nov 05, 2003 at 04:08:44PM -0500, Martin Hicks wrote:
> 
> I think we can fix this problem for my current situation, but those
> percpu_counters are going to cause problems due to their dependence on
> NR_CPUS.  I looked at the super.c briefly, but I still don't understand
> what those counters do.  Is there any possibility of getting rid of the
> percpu_counters from the ext[23] superblock?

They are there so you don't have to take to avoid the mother of all
cache line bounces when allocating blocks.

I will note that with insane-machines-that-only-SGI-would-love with
1024 processors, percpu_counters are always going to take huge amounts
of memory.  So the ext2/ext3 superblock can't be the only place where
you're running in to problems here....

						- Ted




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