Messages in this thread | | | Date | Thu, 03 Aug 2017 16:32:25 -0700 | From | Vikram Mulukutla <> | Subject | Re: [Question]: try to fix contention between expire_timers and try_to_del_timer_sync |
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Hi Qiao,
On 2017-08-01 00:37, qiaozhou wrote: > On 2017年07月31日 19:20, qiaozhou wrote: >> >>
<snip>
>>> ===================================================== >>> Also apply Vikram's patch and have a test. > > cpu2: a53, 832MHz, cpu7: a73, 1.75Hz > Without cpu_relax bodging patch > ===================================================== > cpu2 time | cpu2 counter | cpu7 time | cpu7 counter | > ==========|==============|===========|==============| > 16505| 5243| 2| 12487322| > 16494| 5619| 1| 12013291| > 16498| 5276| 2| 11706824| > 16494| 7123| 1| 12532355| > 16470| 7208| 2| 11784617| > ===================================================== > > cpu2: a53, 832MHz, cpu7: a73, 1.75Hz > With cpu_relax bodging patch: > ===================================================== > cpu2 time | cpu2 counter | cpu7 time | cpu7 counter | > ==========|==============|===========|==============| > 3991| 140714| 1| 11430528| > 4018| 144371| 1| 11430528| > 4034| 143250| 1| 11427011| > 4330| 147345| 1| 11423583| > 4752| 138273| 1| 11433241| > ===================================================== > > It has some improvements, but not so good as Vikram's data. The big > core still has much more chance to acquire lock. >>> >>> Thanks, >>> Vikram >>>
Thanks for your data! I'll check on one of our other platforms to see if I see similar behavior. This may have something to do with the event-stream on your platform or the A53 revision as Sudeep pointed out here [1] - something to check I suppose...
Thanks, Vikram
[1] - https://lkml.org/lkml/2016/11/21/458
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