Messages in this thread | | | From | "Yu, Fenghua" <> | Subject | RE: [PATCH v1 0/2] x86, apic: Disable BSP if boot cpu is AP | Date | Tue, 16 Oct 2012 05:14:46 +0000 |
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> >> My motivation is to use multiple CPUs in order to quickly generate > >> crash dump on the machine with huge amount of memory. I assume such > >> machine tends to also have a lot of CPUs. So disabling one CPU would > >> be no problem. > > > > Luckily you don't need to disable any CPU to archive your goal with > > the BSP hotplug pachest:) > > > > On a dual core/single thread machine, this means you get 100% > performance > > boost with BSP's help. > > > > Plus crash dump kernel code is better structured by not treating BSP > > specially. > > > > Hello Fenghua. > > I've of course noticed your patch set and locally tested, but I saw > NMI to BSP failed in the 2nd kernel. I'll send a log to you later. > > BTW, I tested with your previous v8 patch set. Did you change > something during v8 to v9 relevant to this issue?
In the patch 0/12 in v9, I describe what change is in v9 on the top of v8:
v9: Add Intel vendor check to support the feature on Intel platforms only.
Did you see the BSP wake up failure on the latest tip tree?
There is a rcu regression issue which prevents BSP from waking up in 3.6.0. The issue has been fixed on 10/12. The commit is a4fbe35a. Please make sure your tip tree has this commit.
Thanks.
-Fenghua
Thanks.
-Fenghua
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