[Nouveau] Nouveau kernel module exhausting CPU

Sat May 16 13:23:37 PDT 2015

Yes, so this was all due to this bug:

https://bugs.freedesktop.org/show_bug.cgi?id=90482

On Sun, Apr 05, 2015 at 01:56:51PM -0400, Ilia Mirkin wrote:
> You can use perf to try to see where the cpu time is going.
> 
> On Sun, Apr 5, 2015 at 1:42 PM, Matti Nykyri <Matti.Nykyri at iki.fi> wrote:
> > Hello
> >
> > I recently switched from Nvidia binary driver to Nouveau. I have encountered a possible bug in the kernel module. Before I file a bug report I would like to know if this is a known issue or not.
> >
> > I believe it is related to sleep state and power management of the driver.
> >
> > The Bug:
> >
> > When the computer is left on it's own to go to a power save mode X takes 100% CPU-time in its thread. A trace to X server shows this is caused by select-systemcall immediately returning when X is polling its FD's. The FD nro 12 is constantly indicating that there is data to read so X will never sleep. The FD 12 is a r/w socket connected via netlink to kernel's UEVENT.
> >
> > Restarting X resets the problem to wait again for the sleep state. A new sleep will make the problem arice again.
> >
> >
> > Hardware:
> >
> > I have Fermi nVidia gpu GF104 NVC4 (GeForce GTX 460) and i5 quad core amd64 processor
> >
> > Software:
> >
> > System is running gentoo with stable 'default/linux/amd64/13.0/desktop/kde'-profile
> >
> > Kernel:
> > sys-kernel/gentoo-sources-3.18.7
> >
> > Nouveau driver:
> > x11-drivers/xf86-video-nouveau-1.0.11
> >
> > Xorg-server:
> > x11-base/xorg-server-1.16.4
> >
> > KMS is used for selecting video modes.
> >
> > ---- dmesg ----
> > [    0.623063] [drm] Initialized drm 1.1.0 20060810
> > [    0.623272] nouveau  [  DEVICE][0000:01:00.0] BOOT0  : 0x0c4100a1
> > [    0.623274] nouveau  [  DEVICE][0000:01:00.0] Chipset: GF104 (NVC4)
> > [    0.623275] nouveau  [  DEVICE][0000:01:00.0] Family : NVC0
> > [    0.623307] nouveau  [   VBIOS][0000:01:00.0] checking PRAMIN for image...
> > [    0.716983] nouveau  [   VBIOS][0000:01:00.0] ... appears to be valid
> > [    0.716985] nouveau  [   VBIOS][0000:01:00.0] using image from PRAMIN
> > [    0.717075] nouveau  [   VBIOS][0000:01:00.0] BIT signature found
> > [    0.717076] nouveau  [   VBIOS][0000:01:00.0] version 70.04.1b.00.02
> > [    0.739319] nouveau 0000:01:00.0: irq 34 for MSI/MSI-X
> > [    0.739327] nouveau  [     PMC][0000:01:00.0] MSI interrupts enabled
> > [    0.739359] nouveau  [     PFB][0000:01:00.0] RAM type: GDDR5
> > [    0.739360] nouveau  [     PFB][0000:01:00.0] RAM size: 1024 MiB
> > [    0.739361] nouveau  [     PFB][0000:01:00.0]    ZCOMP: 0 tags
> > [    0.744934] nouveau  [    VOLT][0000:01:00.0] GPU voltage: 875000uv
> > [    0.773304] nouveau  [  PTHERM][0000:01:00.0] FAN control: PWM
> > [    0.773316] nouveau  [  PTHERM][0000:01:00.0] fan management: automatic
> > [    0.773343] nouveau  [  PTHERM][0000:01:00.0] internal sensor: yes
> > [    0.793417] nouveau  [     CLK][0000:01:00.0] 03: core 50 MHz memory 135 MHz
> > [    0.793419] nouveau  [     CLK][0000:01:00.0] 07: core 405 MHz memory 324 MHz
> > [    0.793421] nouveau  [     CLK][0000:01:00.0] 0c: core 405 MHz memory 1900 MHz
> > [    0.793423] nouveau  [     CLK][0000:01:00.0] 0f: core 800 MHz memory 1900 MHz
> > [    0.793498] nouveau  [     CLK][0000:01:00.0] --: core 50 MHz memory 135 MHz
> > [    0.803150] nouveau  [     DRM] VRAM: 1024 MiB
> > [    0.803151] nouveau  [     DRM] GART: 1048576 MiB
> > [    0.803154] nouveau  [     DRM] TMDS table version 2.0
> > [    0.803155] nouveau  [     DRM] DCB version 4.0
> > [    0.803157] nouveau  [     DRM] DCB outp 00: 04000310 00000000
> > [    0.803158] nouveau  [     DRM] DCB outp 01: 02011300 00020030
> > [    0.803159] nouveau  [     DRM] DCB outp 02: 01011302 00020030
> > [    0.803160] nouveau  [     DRM] DCB outp 03: 02022362 00020010
> > [    0.803161] nouveau  [     DRM] DCB outp 04: 08033382 00020030
> > [    0.803162] nouveau  [     DRM] DCB conn 00: 00000000
> > [    0.803164] nouveau  [     DRM] DCB conn 01: 00001130
> > [    0.803165] nouveau  [     DRM] DCB conn 02: 00002261
> > [    0.803166] nouveau  [     DRM] DCB conn 03: 00010330
> > [    0.803819] [drm] forcing VGA-1 connector OFF
> > [    0.803928] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
> > [    0.803928] [drm] Driver supports precise vblank timestamp query.
> > [    0.818699] nouveau  [     DRM] MM: using COPY1 for buffer copies
> > [    1.063301] nouveau  [     DRM] allocated 1920x1080 fb: 0x60000, bo ffff880215bee800
> > [    1.063423] fbcon: nouveaufb (fb0) is primary device
> > [    1.181816] nouveau 0000:01:00.0: fb0: nouveaufb frame buffer device
> > [    1.181817] nouveau 0000:01:00.0: registered panic notifier
> > [    1.197990] [drm] Initialized nouveau 1.2.1 20120801 for 0000:01:00.0 on minor 0
> > ---- end ----
> >
> > X uses 2 separate screens in ZaphodHeads mode
> >
> > ---- Xorg.0.log ----
> > [176404.378] (II) xfree86: Adding drm device (/dev/dri/card0)
> > [176404.384] (II) LoadModule: "nouveau"
> > [176404.385] (II) Loading /usr/lib64/xorg/modules/drivers/nouveau_drv.so
> > [176404.385] (II) Module nouveau: vendor="X.Org Foundation"
> > [176404.385] (II) NOUVEAU driver
> > [176404.385] (II) NOUVEAU driver for NVIDIA chipset families :
> > [176404.386] (II) [drm] nouveau interface version: 1.2.1
> > [176404.386] (II) [drm] nouveau interface version: 1.2.1
> > [176404.387] (--) NOUVEAU(0): Chipset: "NVIDIA NVC4"
> > [176404.387] (==) NOUVEAU(0): Depth 24, (--) framebuffer bpp 32
> > [176404.387] (==) NOUVEAU(0): RGB weight 888
> > [176404.387] (==) NOUVEAU(0): Default visual is TrueColor
> > [176404.387] (**) NOUVEAU(0): Option "ZaphodHeads" "HDMI-1"
> > [176404.387] (==) NOUVEAU(0): Using HW cursor
> > [176404.387] (==) NOUVEAU(0): GLX sync to VBlank enabled.
> > [176404.387] (==) NOUVEAU(0): Page flipping enabled
> > [176404.387] (==) NOUVEAU(0): Swap limit set to 1 [Max allowed 2]
> > [176404.387] (==) NOUVEAU(0): Page flipping synced to vblank by kernel.
> > [176404.387] (II) NOUVEAU(0): Initializing outputs ...
> > [176404.507] (II) NOUVEAU(0): Output HDMI-1 using monitor section Monitor0
> > [176404.507] (**) NOUVEAU(0): Option "PreferredMode" "1920x1080_23"
> > [176404.508] (WW) NOUVEAU(0): Option "MaxClock" requires a frequency value
> > etc...
> > ---- end ----
> >
> > Any ideas?
> >
> > --
> > -Matti
> > _______________________________________________
> > Nouveau mailing list
> > Nouveau at lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/nouveau

-- 
-Matti