Re: sched domains oddness.
- From: Suresh Siddha <suresh.b.siddha@xxxxxxxxx>
- Date: Fri, 31 Oct 2008 10:09:29 -0700
On Fri, Oct 31, 2008 at 09:51:51AM -0700, Peter Zijlstra wrote:
On Fri, 2008-10-31 at 12:24 -0400, Dave Jones wrote:
The attached dmesg comes from my dual core laptop running 2.6.27
What's up with all the sched domains transitions at the bottom?
This was just a boot up from power off, no suspend/resume or anything funky.
CPU0 attaching NULL sched-domain.
CPU1 attaching NULL sched-domain.
CPU0 attaching sched-domain:
domain 0: span 0-1 level MC
groups: 0 1
domain 1: span 0-1 level NODE
groups: 0-1
CPU1 attaching sched-domain:
domain 0: span 0-1 level MC
groups: 1 0
domain 1: span 0-1 level NODE
groups: 0-1
3x
looks like someone is triggering rebuild_sched_domains(), is something
poking cpusetfs files or flipping between sched_mc settings?
I remember someone mentioning that some distro's started setting
sched_mc_power_savings to '1' by default during boot. On a dual-core
laptop, this will not give any advantage.
I have to fix the code to not export this tunable, when we have only
socket in the system.
Dave, Is your distro also setting this tunable blindly during boot :(
thanks,
suresh
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