#14979: CPU scheduler has scalability issues on SMP systems with 10+ CPUs
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Reporter: ambroff | Owner: nobody
Type: bug | Status: new
Priority: normal | Milestone: Unscheduled
Component: - General | Version: R1/Development
Resolution: | Keywords:
Blocked By: | Blocking:
Has a Patch: 0 | Platform: x86-64
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Comment (by ambroff):
At this point I need to do some research to understand how APIC and IPI
are supposed to work. I see one of two possibilities here:
1. The interrupt is being done in such a way that is unnecessarily costly.
2. OR the scheduler needs to behave differently with a large number of
CPUs.
If it turns out that this is already implemented correctly, then I think
it's worth exploring whether it makes sense to change the scheduler to
group CPU cores together into smaller groups, and try to avoid migrating
threads between those groups.
I'm curious to see if you guys can find any bugs in my analysis so far.
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Ticket URL: <https://dev.haiku-os.org/ticket/14979#comment:1>
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