Fwd: Abnormal battery drain with kernel 6.5 (Ryzen 5500u)

Fwd: Abnormal battery drain with kernel 6.5 (Ryzen 5500u)

[Bagas Sanjaya]

Hi,

I notice a regression report on Bugzilla [1] that have been already handled
there. Quoting from it:

> After switching from 6.4.x kernel to 6.5 I experienced an abnormal battery drain since my laptop is actually never idle.
> I accepted default CPUfreq to schedutil and AMD Processor P-State mode is 3 (active). 
> 
> I expected a different behaviour, but am I missing something?
> In my boot configuration I had "amd_pstate.shared_mem=1" and tried to remove this switch, but did not affect my power consuption.
> 
> Is there something changed from 6.4.x to 6.5 that requires a different configuration to get an optimal power consumption?
> 
> Thanks a lot for your attention

See Bugzilla for the full thread.

Anyway, I'm adding it to regzbot:

#regzbot introduced: v6.4..v6.5 https://bugzilla.kernel.org/show_bug.cgi?id=217853

Thanks.

-- 
An old man doll... just what I always wanted! - Clara

Re: Fwd: Abnormal battery drain with kernel 6.5 (Ryzen 5500u)

[Huang Rui]

On Fri, Sep 01, 2023 at 05:42:22PM +0800, Bagas Sanjaya wrote:
> Hi,
> 
> I notice a regression report on Bugzilla [1] that have been already handled
> there. Quoting from it:
> 
> > After switching from 6.4.x kernel to 6.5 I experienced an abnormal battery drain since my laptop is actually never idle.
> > I accepted default CPUfreq to schedutil and AMD Processor P-State mode is 3 (active). 
> > 
> > I expected a different behaviour, but am I missing something?
> > In my boot configuration I had "amd_pstate.shared_mem=1" and tried to remove this switch, but did not affect my power consuption.
> > 
> > Is there something changed from 6.4.x to 6.5 that requires a different configuration to get an optimal power consumption?
> > 
> > Thanks a lot for your attention
> 
> See Bugzilla for the full thread.
> 
> Anyway, I'm adding it to regzbot:
> 
> #regzbot introduced: v6.4..v6.5 https://bugzilla.kernel.org/show_bug.cgi?id=217853
> 

+ Meng Li/Perry,

May we know which CPU type are you using? Try "lscpu"?

Thanks,
Ray

Re: Abnormal battery drain with kernel 6.5 (Ryzen 5500u)

[Michele Della Guardia]

Hi, my CPU is AMD Ryzen 5500u.
Thanks a lot

Michele

---
Architecture:                       x86_64
CPU op-mode(s):                     32-bit, 64-bit
Byte Order:                         Little Endian
Address sizes:                      48 bits physical, 48 bits virtual
CPU(s):                             12
On-line CPU(s) list:                0-11
Thread(s) per core:                 2
Core(s) per socket:                 6
Socket(s):                          1
NUMA node(s):                       1
Vendor ID:                          AuthenticAMD
CPU family:                         23
Model:                              104
Model name:                         AMD Ryzen 5 5500U with Radeon Graphics
Stepping:                           1
Frequency boost:                    enabled
CPU MHz:                            975.888
CPU max MHz:                        4056,0000
CPU min MHz:                        400,0000
BogoMIPS:                           4191.99
Virtualization:                     AMD-V
L1d cache:                          192 KiB
L1i cache:                          192 KiB
L2 cache:                           3 MiB
L3 cache:                           8 MiB
NUMA node0 CPU(s):                  0-11
Vulnerability Gather data sampling: Not affected
Vulnerability Itlb multihit:        Not affected
Vulnerability L1tf:                 Not affected
Vulnerability Mds:                  Not affected
Vulnerability Meltdown:             Not affected
Vulnerability Mmio stale data:      Not affected
Vulnerability Retbleed:             Mitigation; untrained return thunk; SMT enab
                                    led with STIBP protection
Vulnerability Spec rstack overflow: Mitigation; safe RET
Vulnerability Spec store bypass:    Mitigation; Speculative Store Bypass disable
                                    d via prctl
Vulnerability Spectre v1:           Mitigation; usercopy/swapgs barriers and __u
                                    ser pointer sanitization
Vulnerability Spectre v2:           Mitigation; Retpolines, IBPB conditional, ST
                                    IBP always-on, RSB filling, PBRSB-eIBRS Not 
                                    affected
Vulnerability Srbds:                Not affected
Vulnerability Tsx async abort:      Not affected
Flags:                              fpu vme de pse tsc msr pae mce cx8 apic sep 
                                    mtrr pge mca cmov pat pse36 clflush mmx fxsr
                                     sse sse2 ht syscall nx mmxext fxsr_opt pdpe
                                    1gb rdtscp lm constant_tsc rep_good nopl non
                                    stop_tsc cpuid extd_apicid aperfmperf rapl p
                                    ni pclmulqdq monitor ssse3 fma cx16 sse4_1 s
                                    se4_2 movbe popcnt aes xsave avx f16c rdrand
                                     lahf_lm cmp_legacy svm extapic cr8_legacy a
                                    bm sse4a misalignsse 3dnowprefetch osvw ibs 
                                    skinit wdt tce topoext perfctr_core perfctr_
                                    nb bpext perfctr_llc mwaitx cpb cat_l3 cdp_l
                                    3 hw_pstate ssbd mba ibrs ibpb stibp vmmcall
                                     fsgsbase bmi1 avx2 smep bmi2 cqm rdt_a rdse
                                    ed adx smap clflushopt clwb sha_ni xsaveopt 
                                    xsavec xgetbv1 cqm_llc cqm_occup_llc cqm_mbm
                                    _total cqm_mbm_local clzero irperf xsaveerpt
                                    r rdpru wbnoinvd cppc arat npt lbrv svm_lock
                                     nrip_save tsc_scale vmcb_clean flushbyasid 
                                    decodeassists pausefilter pfthreshold avic v
                                    _vmsave_vmload vgif v_spec_ctrl umip rdpid o
                                    verflow_recov succor smca





Il venerdì 8 settembre 2023 alle ore 06:41:42 CEST, Huang Rui <ray.huang@amd.com> ha scritto: 





On Fri, Sep 01, 2023 at 05:42:22PM +0800, Bagas Sanjaya wrote:
> Hi,
> 
> I notice a regression report on Bugzilla [1] that have been already handled
> there. Quoting from it:
> 
> > After switching from 6.4.x kernel to 6.5 I experienced an abnormal battery drain since my laptop is actually never idle.
> > I accepted default CPUfreq to schedutil and AMD Processor P-State mode is 3 (active). 
> > 
> > I expected a different behaviour, but am I missing something?
> > In my boot configuration I had "amd_pstate.shared_mem=1" and tried to remove this switch, but did not affect my power consuption.
> > 
> > Is there something changed from 6.4.x to 6.5 that requires a different configuration to get an optimal power consumption?
> > 
> > Thanks a lot for your attention
> 
> See Bugzilla for the full thread.
> 
> Anyway, I'm adding it to regzbot:
> 
> #regzbot introduced: v6.4..v6.5 https://bugzilla.kernel.org/show_bug.cgi?id=217853
> 

+ Meng Li/Perry,

May we know which CPU type are you using? Try "lscpu"?


Thanks,

Ray

Re: Fwd: Abnormal battery drain with kernel 6.5 (Ryzen 5500u)

[Bagas Sanjaya]

[-- Attachment #1: Type: text/plain, Size: 1522 bytes --]

On Fri, Sep 08, 2023 at 12:41:14PM +0800, Huang Rui wrote:
> On Fri, Sep 01, 2023 at 05:42:22PM +0800, Bagas Sanjaya wrote:
> > Hi,
> > 
> > I notice a regression report on Bugzilla [1] that have been already handled
> > there. Quoting from it:
> > 
> > > After switching from 6.4.x kernel to 6.5 I experienced an abnormal battery drain since my laptop is actually never idle.
> > > I accepted default CPUfreq to schedutil and AMD Processor P-State mode is 3 (active). 
> > > 
> > > I expected a different behaviour, but am I missing something?
> > > In my boot configuration I had "amd_pstate.shared_mem=1" and tried to remove this switch, but did not affect my power consuption.
> > > 
> > > Is there something changed from 6.4.x to 6.5 that requires a different configuration to get an optimal power consumption?
> > > 
> > > Thanks a lot for your attention
> > 
> > See Bugzilla for the full thread.
> > 
> > Anyway, I'm adding it to regzbot:
> > 
> > #regzbot introduced: v6.4..v6.5 https://bugzilla.kernel.org/show_bug.cgi?id=217853
> > 
> 
> + Meng Li/Perry,
> 
> May we know which CPU type are you using? Try "lscpu"?
> 

Sorry for the replying just now.

The reporter (on Bugzilla) had bisected to commit c8afaa1b0f8bc9 ("locking:
remove spin_lock_prefetch"). Telling regzbot:

#regzbot introduced: c8afaa1b0f8bc9
#regzbot title: spin_lock_prefetch() removal causes abnormal battery drain on Ryzen 5500u

Thanks.

-- 
An old man doll... just what I always wanted! - Clara

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 228 bytes --]

Re: Fwd: Abnormal battery drain with kernel 6.5 (Ryzen 5500u)

[Mateusz Guzik]

On 11/2/23, Bagas Sanjaya <bagasdotme@gmail.com> wrote:
> On Fri, Sep 08, 2023 at 12:41:14PM +0800, Huang Rui wrote:
>> On Fri, Sep 01, 2023 at 05:42:22PM +0800, Bagas Sanjaya wrote:
>> > Hi,
>> >
>> > I notice a regression report on Bugzilla [1] that have been already
>> > handled
>> > there. Quoting from it:
>> >
>> > > After switching from 6.4.x kernel to 6.5 I experienced an abnormal
>> > > battery drain since my laptop is actually never idle.
>> > > I accepted default CPUfreq to schedutil and AMD Processor P-State mode
>> > > is 3 (active).
>> > >
>> > > I expected a different behaviour, but am I missing something?
>> > > In my boot configuration I had "amd_pstate.shared_mem=1" and tried to
>> > > remove this switch, but did not affect my power consuption.
>> > >
>> > > Is there something changed from 6.4.x to 6.5 that requires a different
>> > > configuration to get an optimal power consumption?
>> > >
>> > > Thanks a lot for your attention
>> >
>> > See Bugzilla for the full thread.
>> >
>> > Anyway, I'm adding it to regzbot:
>> >
>> > #regzbot introduced: v6.4..v6.5
>> > https://bugzilla.kernel.org/show_bug.cgi?id=217853
>> >
>>
>> + Meng Li/Perry,
>>
>> May we know which CPU type are you using? Try "lscpu"?
>>
>
> Sorry for the replying just now.
>
> The reporter (on Bugzilla) had bisected to commit c8afaa1b0f8bc9 ("locking:
> remove spin_lock_prefetch"). Telling regzbot:
>
> #regzbot introduced: c8afaa1b0f8bc9
> #regzbot title: spin_lock_prefetch() removal causes abnormal battery drain
> on Ryzen 5500u
>

This particular commit is highly unlikely to be causing anything of the sort.

Looking at the bz I suspect the reporter did not follow through with
bisection, to quote:
> Tried to bisect following docs and I had just this output:
> [c8afaa1b0f8bc93d013ab2ea6b9649958af3f1d3] locking: remove spin_lock_prefetch

But that's what one gets when bisection is still in progress.

Final message, should one go through with everything and this commit
indeed was the culprit, would start with this:
> c8afaa1b0f8bc93d013ab2ea6b9649958af3f1d3 is the first bad commit

Perhaps you could help the reporter through building the kernel and
picking good/bad status. I don't know how easily visible the issue is.

-- 
Mateusz Guzik <mjguzik gmail.com>