Hi,
After reading the RCU cpu stall doc. I thought that CONFIG_NO_HZ might
have something to do with this problem. And I think the NO_HZ config is
not good for RT performance, so I made a new kernel without NO_HZ. It
lasted longer but eventually cpu stalls happened again.
I then disable the cpu stall checking by set
/sys/module/rcutree/parameters/rcu_cpu_stall_suppress
to "1", but it did not solve the problem. Instead of cpu stall I had
BUG: soft lockup - CPU#0 stuck for 279s! [swapper/0:0]
And even I disabled Hyper-Threading, I also got cpu stall now.
CPU stalls also occurred in KVM guest OS as well.
But I never get cpu stall when I'm running the normal kernel without -rt
patch.
Is the cpu stall a known issue with the rt patch?
Thanks,
Dong
On 6/27/12 11:22 PM, Dong Liu wrote:
Hi,
I'm running 3.4.3-rt11 and 3.2.18-rt29 on a system with Intel I7 860, I
noticed that with hyperthread enabled, I'm getting kernel error
rcu_preempt detected stalls on CPUs/tasks: { 3} (detected by 5, t=60002
jiffies)
But with hyperthread disabled, no such error.
Is preempt_rt not supposed to be used with hyperthread?
Thanks,
Dong
P.S.
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