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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: Slow (higher scheduling latency?) system after S3 - regression 4.17 -> 4.19 ?
On Fri, Mar 27, 2026 at 01:47:55PM +0100, Marek Marczykowski-Górecki wrote:
> Some further observation, this time regarding timers:
In the meantime Roger suggested it might be about C-states. So, I just
tried booting with max_cstate=0. I got this:
[2026-04-02 11:41:57] (XEN) [ 4.327519] mwait-idle: disabled
But then xenpm reports C1 is still used:
# xenpm get-cpuidle-states
Max possible C-state: C0
cpu id : 0
total C-states : 2
idle time(ms) : 3727115
C0 : transition [ 0]
residency [ 3769835 ms]
C1 : transition [ 0]
residency [ 0 ms]
cpu id : 1
total C-states : 2
idle time(ms) : 3763654
C0 : transition [ 1]
residency [ 0 ms]
C1 : transition [ 1]
residency [ 3769838 ms]
cpu id : 2
total C-states : 2
idle time(ms) : 3729168
C0 : transition [ 1]
residency [ 0 ms]
C1 : transition [ 1]
residency [ 3769838 ms]
cpu id : 3
total C-states : 2
idle time(ms) : 3750226
C0 : transition [ 1]
residency [ 0 ms]
C1 : transition [ 1]
residency [ 3769840 ms]
cpu id : 4
total C-states : 2
idle time(ms) : 3726369
C0 : transition [ 1]
residency [ 0 ms]
C1 : transition [ 1]
residency [ 3769840 ms]
cpu id : 5
total C-states : 2
idle time(ms) : 3755733
C0 : transition [ 1]
residency [ 0 ms]
C1 : transition [ 1]
residency [ 3769840 ms]
cpu id : 6
total C-states : 2
idle time(ms) : 3725747
C0 : transition [ 1]
residency [ 0 ms]
C1 : transition [ 1]
residency [ 3769841 ms]
cpu id : 7
total C-states : 2
idle time(ms) : 3730190
C0 : transition [ 1]
residency [ 0 ms]
C1 : transition [ 1]
residency [ 3769841 ms]
cpu id : 8
total C-states : 2
idle time(ms) : 3716485
C0 : transition [ 1]
residency [ 0 ms]
C1 : transition [ 1]
residency [ 3769841 ms]
cpu id : 9
total C-states : 2
idle time(ms) : 3710830
C0 : transition [ 1]
residency [ 0 ms]
C1 : transition [ 1]
residency [ 3769842 ms]
cpu id : 10
total C-states : 2
idle time(ms) : 3704881
C0 : transition [ 1]
residency [ 0 ms]
C1 : transition [ 1]
residency [ 3769842 ms]
cpu id : 11
total C-states : 2
idle time(ms) : 3719333
C0 : transition [ 1]
residency [ 0 ms]
C1 : transition [ 1]
residency [ 3769842 ms]
cpu id : 12
total C-states : 2
idle time(ms) : 3715059
C0 : transition [ 1]
residency [ 0 ms]
C1 : transition [ 1]
residency [ 3769842 ms]
cpu id : 13
total C-states : 2
idle time(ms) : 3711681
C0 : transition [ 1]
residency [ 0 ms]
C1 : transition [ 1]
residency [ 3769843 ms]
cpu id : 14
total C-states : 2
idle time(ms) : 3709380
C0 : transition [ 1]
residency [ 0 ms]
C1 : transition [ 1]
residency [ 3769843 ms]
cpu id : 15
total C-states : 2
idle time(ms) : 3720119
C0 : transition [ 1]
residency [ 0 ms]
C1 : transition [ 1]
residency [ 3769843 ms]
cpu id : 16
total C-states : 2
idle time(ms) : 3737637
C0 : transition [ 1]
residency [ 0 ms]
C1 : transition [ 1]
residency [ 3769844 ms]
cpu id : 17
total C-states : 2
idle time(ms) : 3737662
C0 : transition [ 1]
residency [ 0 ms]
C1 : transition [ 1]
residency [ 3769844 ms]
cpu id : 18
total C-states : 2
idle time(ms) : 3729870
C0 : transition [ 1]
residency [ 0 ms]
C1 : transition [ 1]
residency [ 3769844 ms]
cpu id : 19
total C-states : 2
idle time(ms) : 3745564
C0 : transition [ 1]
residency [ 0 ms]
C1 : transition [ 1]
residency [ 3769845 ms]
cpu id : 20
total C-states : 2
idle time(ms) : 3717089
C0 : transition [ 1]
residency [ 0 ms]
C1 : transition [ 1]
residency [ 3769845 ms]
cpu id : 21
total C-states : 2
idle time(ms) : 3590257
C0 : transition [ 1]
residency [ 0 ms]
C1 : transition [ 1]
residency [ 3769845 ms]
And the issue still happens...
Honestly, I'm confused about the above output. The system is mostly
idle, but I wouldn't expect it to be _that_ idle - there is xenstored +
xenconsoled running, plus occasional xl create for testing with
short-lived domU. Does it really all happen only on CPU0 here?
--
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab
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