[linux-audio-dev] kernel 2.6.6 just out

[Robert Jonsson]

Hi,

As a service to all readers, here's an excerpt of the Changelog concerning 
latency: ;)

<akpm at osdl.org>
	[PATCH] Add mpage_writepages() scheduling point
	
	From: Jens Axboe <axboe at suse.de>
	
	Takashi did some nice latency testing of the current kernel (with -mm
	writeback changes), and the biggest offender in general core is
	mpage_writepages().

<akpm at osdl.org>
	[PATCH] ia32: 4Kb stacks (and irqstacks) patch
	
	From: Arjan van de Ven <arjanv at redhat.com>
	
	Below is a patch to enable 4Kb stacks for x86. The goal of this is to
	
	1) Reduce footprint per thread so that systems can run many more threads
	   (for the java people)
	
	2) Reduce the pressure on the VM for order > 0 allocations. We see real life
	   workloads (granted with 2.4 but the fundamental fragmentation issue isn't
	   solved in 2.6 and isn't solvable in theory) where this can be a problem.
	   In addition order > 0 allocations can make the VM "stutter" and give more
	   latency due to having to do much much more work trying to defragment

<akpm at osdl.org>
	[PATCH] reiserfs: scheduling latency improvements

<akpm at osdl.org>
	[PATCH] unmap_vmas latency improvement
	
	unmap_vmas() will cause scheduling latency when tearing down really big vmas
	on !CONFIG_PREEMPT.  That's a bit unkind to the non-preempt case, so let's do
	a cond_resched() after zapping 1024 pages.


So... humbly asking, is it time yet to make the switch? :-)

/Robert