[lustre-discuss] 2.10.0 CentOS6.9 ksoftirqd CPU load

[Dzmitryj Jakavuk]

Indeed! Already  tested 2.10.4  with a fixed issue
  

> On May 31, 2018, at 09:15, Hans Henrik Happe <happe at nbi.dk> wrote:
> 
> Happy to report that 2.10.4 fixed this issue.
> 
> Cheers,
> Hans Henrik
> 
> On 06-04-2018 14:48, Hans Henrik Happe wrote:
>> Just for the record. 2.11.0 has fixed this. Not sure which LU though.
>> 
>> Cheers,
>> Hans Henrik
>> 
>> On 30-09-2017 23:43, Hans Henrik Happe wrote:
>>> On 27-09-2017 18:50, Dilger, Andreas wrote:
>>>> On Sep 26, 2017, at 01:10, Hans Henrik Happe<happe at nbi.dk>  wrote:
>>>>> Hi,
>>>>> 
>>>>> Did anyone else experience CPU load from ksoftirqd after 'modprobe
>>>>> lustre'? On an otherwise idle node I see:
>>>>> 
>>>>>   PID USER      PR   NI VIRT  RES  SHR S %CPU  %MEM TIME+   COMMAND
>>>>>     9 root      20   0     0    0    0 S 28.5  0.0  2:05.58 ksoftirqd/1
>>>>> 
>>>>> 
>>>>>    57 root      20   0     0    0    0 R 23.9  0.0  2:22.91
>>>>> ksoftirqd/13
>>>>> 
>>>>> The sum of those two is about 50% CPU.
>>>>> 
>>>>> I have narrowed it down to the ptlrpc module. When I remove that, it
>>>>> stops.
>>>>> 
>>>>> I also tested the 2.10.1-RC1, which is the same.
>>>> If you can run "echo l > /proc/sysrq-trigger" it will report the
>>>> processes
>>>> that are currently running on the CPUs of your system to the console
>>>> (and
>>>> also /var/log/messages, if it can write everything in time).
>>>> 
>>>> You might need to do this several times to get a representative
>>>> sample of
>>>> the ksoftirqd process stacks to see what they are doing that is
>>>> consuming
>>>> so much CPU.
>>>> 
>>>> Alternately, "echo t > /proc/sysrq-trigger" will report the stacks of
>>>> all
>>>> processes to the console (and /v/l/m), but there will be a lot of them,
>>>> and no better chance that it catches what ksoftirqd is doing 25% of
>>>> the time.
>>> I've attached the stacks. Some wakeup which I guess are initiated by
>>> something in the ptlrpc code.
>>> 
>>> Cheers,
>>> Hans Henrik
>>> 
>>> 
>>> 
>>> 
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