[haiku-bugs] Re: [Haiku] #14659: KGPE-D16 support, dual socket/NUMA issues

  • From: "Haiku" <trac@xxxxxxxxxxxx>
  • To: undisclosed-recipients: ;
  • Date: Tue, 11 Dec 2018 07:36:12 -0000

#14659: KGPE-D16 support, dual socket/NUMA issues
-----------------------------+----------------------------
   Reporter:  cb88           |      Owner:  nobody
       Type:  bug            |     Status:  new
   Priority:  normal         |  Milestone:  Unscheduled
  Component:  System/Kernel  |    Version:  R1/Development
 Resolution:                 |   Keywords:  NUMA
 Blocked By:                 |   Blocking:
Has a Patch:  0              |   Platform:  x86-64
-----------------------------+----------------------------

Comment (by cb88):

 Replying to [comment:6 waddlesplash]:

On a system without KVM, cores=2,sockets=2 is enough to trigger it. So
 it is apparently a race condition of some kind.

 That's very odd, since QEMU's CPU emulation is single threaded unless you
 turn on multithreaded TGC explicitly you wouldn't think it would occur
 there. From what I understand IO and such is on a separate thread...
 perhaps that is it since 2 sockets imply multiple APICS? Perhaps the APICs
 are getting setup incorrectly somehow?

-- 
Ticket URL: <https://dev.haiku-os.org/ticket/14659#comment:7>
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