Messages in this thread | | | Date | Fri, 25 Dec 2009 12:18:57 +0100 | From | Takashi Iwai <> | Subject | Re: intel hda regression: 2.6.33-rc{1,2}: hd-audio0 eats 25% CPU (according to top) |
| |
At Fri, 25 Dec 2009 12:21:07 +0200, Sergei Trofimovich wrote: > > $SUBJ > > $ git describe > v2.6.33-rc2 > > No matter if I actually play any sounds that process consumes 23-24% CPU > Don't know if it's related to above: even if there is no any sound activity > I can hear crackling in headphones. > > $ lspci -vvv > > 00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 03) > Subsystem: Hewlett-Packard Company Device 30c9 > Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+ > Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- > Latency: 0, Cache Line Size: 64 bytes > Interrupt: pin A routed to IRQ 27 > Region 0: Memory at e0644000 (64-bit, non-prefetchable) [size=16K] > Capabilities: [50] Power Management version 2 > Flags: PMEClk- DSI- D1- D2- AuxCurrent=55mA PME(D0+,D1-,D2-,D3hot+,D3cold+) > Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME- > Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit+ > Address: 00000000fee0300c Data: 4191 > Capabilities: [70] Express (v1) Root Complex Integrated Endpoint, MSI 00 > DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s unlimited, L1 unlimited > ExtTag- RBE- FLReset- > DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported- > RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop+ > MaxPayload 128 bytes, MaxReadReq 128 bytes > DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend- > LnkCap: Port #0, Speed unknown, Width x0, ASPM unknown, Latency L0 <64ns, L1 <1us > ClockPM- Surprise- LLActRep- BwNot- > LnkCtl: ASPM Disabled; Disabled- Retrain- CommClk- > ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- > LnkSta: Speed unknown, Width x0, TrErr- Train- SlotClk- DLActive- BWMgmt- ABWMgmt- > Capabilities: [100] Virtual Channel <?> > Capabilities: [130] Root Complex Link <?> > Kernel driver in use: HDA Intel > Kernel modules: snd-hda-intel > > $ powertop > > Cn Avg residency P-states (frequencies) > C0 (cpu running) (25.1%) 1200 Mhz 4.7% > C1 0.0ms ( 0.0%) 1067 Mhz 0.2% > C2 0.3ms (74.9%) 933 Mhz 0.2% > 800 Mhz 94.9% > > > Wakeups-from-idle per second : 2931.9 interval: 10.0s > no ACPI power usage estimate available > > Top causes for wakeups: > 80.6% (6766.8) <interrupt> : HDA Intel > 10.5% (885.6) <kernel IPI> : Rescheduling interrupts > 6.4% (541.3) <kernel core> : hrtimer_start_range_ns (tick_sched_timer) This has been already reported by some people, but unfortunately I couldn't reproduce this on my test machines.
Eric figured out that replacing the whole sound/pci/hda/* files with 2.6.31 works, so this must be a regression in that area. Could someone bisect it? The commits to check are restricted only in sound/pci/hda, so there shouldn't be many changes.
% git bisect start -- sound/pci/hda % git bisect bad % git bisect good v2.6.32
thanks,
Takashi
| |