5.4-prerelease - hanging under load

[Nate Lawson]

Pierre-Luc Drouin wrote:
> Nate Lawson wrote:
> 
>> Pierre-Luc Drouin wrote:
>>
>>> Matthias Buelow wrote:
>>>
>>>> Nate Lawson <nate at root.org> writes:
>>>>
>>>>  
>>>>
>>>>> sysctl dev.cpu and look at the current frequency setting.  If low, 
>>>>> then your system is affected and will be fixed soon when I mfc.  If 
>>>>> not, perhaps you have an interrupt storm (vmstat -i)
>>>>>   
>>>>
>>>>
>>>>
>>>>
>>>> Just for the record. I ran vmstat -i in a loop while untarring the
>>>> thunderbird source (causing degraded interactive responsiveness, as
>>>> reported in an earlier mail), and couldn't see any noticable 
>>>> increase in
>>>> interrupt rate.
>>>>
>>>> mkb.
>>>>
>>>>  
>>>>
>>> I've noticed that the idle process is using sometimes as much as 60% 
>>> of my CPU. Could it be a relation between that and the lag we have 
>>> with 5.4?
>>
>>
>>
>> That is different.  sysctl hw.acpi.cpu.cx_lowest="C1" to see if that 
>> works around it.
>>
> I already have this

Then it's not acpi since c1 is the old (even 4.x) behavior.

-- 
Nate