RE: [REGRESSION] Re: [PATCH 00/24] Complete EEVDF

["Doug Smythies" <dsmythies@telus.net>]

On 2025.07.11:24 Peter Zijlstra wrote:
> On Tue, Jan 07, 2025 at 12:26:07PM +0100, Peter Zijlstra wrote:

>> So I've taken the second node offline, running with 10 cores (20
>> threads) now.
>> 
>> usec    Time_Of_Day_Seconds     CPU     Busy%   IRQ
>>  106783 1736248404.951438       -       100.00  20119
>>      46 1736248404.844701       0       100.00  1005
>>      41 1736248404.844742       20      100.00  1007
>>      42 1736248404.844784       1       100.00  1005
>>      40 1736248404.844824       21      100.00  1006
>>      41 1736248404.844865       2       100.00  1005
>>      40 1736248404.844905       22      100.00  1006
>>      41 1736248404.844946       3       100.00  1006
>>      40 1736248404.844986       23      100.00  1005
>>      41 1736248404.845027       4       100.00  1005
>>      40 1736248404.845067       24      100.00  1006
>>      41 1736248404.845108       5       100.00  1011
>>      40 1736248404.845149       25      100.00  1005
>>      41 1736248404.845190       6       100.00  1005
>>      40 1736248404.845230       26      100.00  1005
>>      42 1736248404.845272       7       100.00  1007
>>      41 1736248404.845313       27      100.00  1005
>>      41 1736248404.845355       8       100.00  1005
>>      42 1736248404.845397       28      100.00  1006
>>      46 1736248404.845443       9       100.00  1009
>>  105995 1736248404.951438       29      100.00  1005
>> 
>> Is by far the worst I've had in the past few minutes playing with this.
>
> Much also depends on how much (or if at all) cgroups are used.
>
> What exact cgroup config are you having? /sys/kernel/debug/sched/debug
> should be able to tell you.

I do not know.
I'll capture the above output, compress it, and send it to you.

I did also boot with systemd.unified_cgroup_hierarchy=0
and it made no difference.