Ubuntu
linux package

CONFIG_DMA_CMA causes ttm performance problems/hangs

Bug #1362261 reported by Andreas Schultz on 2014-08-27

This bug affects 7 people

	Status	Importance	Assigned to
linux (Ubuntu)	Fix Released	Medium	Unassigned
Trusty	Confirmed	Medium	Unassigned
Utopic	Fix Released	Medium	Unassigned

Bug Description

The x86_64 kernels have CONFIG_DMA_CMA enabled, this causes extrem hangs of at least the RADEON driver

full discussion is here: http://lists.freedesktop.org/archives/dri-devel/2014-August/065842.html

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: linux-image-3.16.0-10-generic 3.16.0-10.15
ProcVersionSignature: Ubuntu 3.16.0-10.15-generic 3.16.1
Uname: Linux 3.16.0-10-generic x86_64
ApportVersion: 2.14.6-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: aschultz 2224 F.... pulseaudio
/dev/snd/controlC1: aschultz 2224 F.... pulseaudio
CurrentDesktop: XFCE
Date: Wed Aug 27 18:57:02 2014
HibernationDevice: RESUME=UUID=702fb398-84d9-4e93-9b4b-980323bf2d53
MachineType: Hewlett-Packard HP EliteBook 8560w
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-3.16.0-10-generic root=UUID=9a10044a-a505-4049-b794-a0ab87709daa ro rootflags=subvol=@ quiet splash init=/lib/systemd/systemd vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.16.0-10-generic N/A
linux-backports-modules-3.16.0-10-generic N/A
linux-firmware 1.132
SourcePackage: linux
UpgradeStatus: Upgraded to utopic on 2014-07-21 (37 days ago)
dmi.bios.date: 07/15/2013
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68SVD Ver. F.42
dmi.board.name: 1631
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 01.3D
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvr68SVDVer.F.42:bd07/15/2013:svnHewlett-Packard:pnHPEliteBook8560w:pvrA0001D02:rvnHewlett-Packard:rn1631:rvrKBCVersion01.3D:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP EliteBook 8560w
dmi.product.version: A0001D02
dmi.sys.vendor: Hewlett-Packard

Tags:

Revision history for this message

Andreas Schultz (aschultz) wrote on 2014-08-27:

AlsaInfo.txt Edit (29.8 KiB, text/plain; charset="utf-8")
BootDmesg.txt Edit (72.9 KiB, text/plain; charset="utf-8")
CRDA.txt Edit (203 bytes, text/plain; charset="utf-8")
CurrentDmesg.txt Edit (250.5 KiB, text/plain; charset="utf-8")
Dependencies.txt Edit (3.4 KiB, text/plain; charset="utf-8")
IwConfig.txt Edit (252 bytes, text/plain; charset="utf-8")
Lspci.txt Edit (14.2 KiB, text/plain; charset="utf-8")
Lsusb.txt Edit (1.1 KiB, text/plain; charset="utf-8")
ProcCpuinfo.txt Edit (7.2 KiB, text/plain; charset="utf-8")
ProcEnviron.txt Edit (106 bytes, text/plain; charset="utf-8")
ProcInterrupts.txt Edit (5.6 KiB, text/plain; charset="utf-8")
ProcModules.txt Edit (5.7 KiB, text/plain; charset="utf-8")
PulseList.txt Edit (22.4 KiB, text/plain; charset="utf-8")
RfKill.txt Edit (238 bytes, text/plain; charset="utf-8")
UdevDb.txt Edit (191.3 KiB, text/plain; charset="utf-8")
UdevLog.txt Edit (400.7 KiB, text/plain; charset="utf-8")
WifiSyslog.txt Edit (239.8 KiB, text/plain; charset="utf-8")

Revision history for this message

Brad Figg (brad-figg) wrote on 2014-08-27: Status changed to Confirmed

This change was made by a bot.

Changed in linux (Ubuntu):
status:	New → Confirmed

Revision history for this message

Joseph Salisbury (jsalisbury) wrote on 2014-08-27:

The CONFIG_DMA_CMA parameter was enabled in trusty in Ubuntu-3.13.0-24.46 by commit:

a9d615a UBUNTU: Rebase to 2d3c627502f2a9b0a7de06a5a2df2365542a72c9

Changed in linux (Ubuntu):
importance:	Undecided → Medium
status:	Confirmed → Triaged

Joseph Salisbury (jsalisbury) on 2014-08-27

tags:

added: kernel-key

Revision history for this message

Andy Whitcroft (apw) wrote on 2014-08-28:

Confirming this option is enabled for Trusty and Utopic, creating tasks there. Currently, the discussion is still ongoing, but the primary bug seems to be that DMA requests for order 0 pages are being passed into CMA which makes no sense and triggers the issue. We are expecting a patch for that to be pushed upstream shortly.

Revision history for this message

Andy Whitcroft (apw) wrote on 2014-08-28:

Overall the recommendation seems to be that this should be disabled on x86.

Revision history for this message

RussianNeuroMancer (russianneuromancer) wrote on 2014-09-02:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1363384

Revision history for this message

Launchpad Janitor (janitor) wrote on 2014-09-02:

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in linux (Ubuntu Trusty):
status:	New → Confirmed

Joseph Salisbury (jsalisbury) on 2014-09-02

Changed in linux (Ubuntu Trusty):
importance:	Undecided → Medium

Revision history for this message

Joseph Salisbury (jsalisbury) wrote on 2014-09-09:

Upstream discussion:
https://lkml.org/lkml/2014/8/8/445

Revision history for this message

Joseph Salisbury (jsalisbury) wrote on 2014-09-09:

I built a Trusty test kernel with CONFIG_DMA_CMA not set.

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1362261/

Can you test this kernel can confirm it fixes the bug? Be sure to install both the linux-image and linux-image-extra .deb packages.

If it does fix the bug, I can submit and SRU request to have CONFIG_DMA_CMA disabled.

Tim Gardner (timg-tpi) on 2014-09-12

Changed in linux (Ubuntu Utopic):
status:	Triaged → Fix Committed

Revision history for this message

Gannet (ken20001) wrote on 2014-09-15:

#10

Does CONFIG_DMA_CMA parameter enabled in 3.13.0-35 ? Because I have no problem with it unlike 3.16+.

Revision history for this message

Joseph Salisbury (jsalisbury) wrote on 2014-09-15:

#11

Thanks, Gannet. Can folks affected by this bug report if it does in fact affect Trusty, or only Utopic? If it does affect Trusty, there is a test kernel posted in comment #9.

Changed in linux (Ubuntu Trusty):
status:	Confirmed → Incomplete

Revision history for this message

Gannet (ken20001) wrote on 2014-09-15:

#12

As I wrote it affects me in Trusty with kernel 3.16 and higher. But with 3.13.0-35, also in Trusty, all it seems is ok.

Revision history for this message

RussianNeuroMancer (russianneuromancer) wrote on 2014-09-16:

#13

For me this bug reproducible only with 3.16 and 3.17 kernels. With 3.15 and previous kernels this bug is not reproducible, at least on my hardware (Radeon HD 6620G).

Revision history for this message

Launchpad Janitor (janitor) wrote on 2014-09-18:

#14

This bug was fixed in the package linux - 3.16.0-16.22

---------------
linux (3.16.0-16.22) utopic; urgency=low

[ Andy Whitcroft ]

  * Revert "SAUCE: x86/xen: Fix setup of 64bit kernel pagetables"
  * [Config] tools -- only build common tools when enabled
  * [Config] follow rename of DEB_BUILD_PROFILES

[ Tim Gardner ]

  * [Debian] set do_*_tools after stage1 or bootstrap is determined
    - LP: #1370211
  * Release Tracking Bug
    - LP: #1370535

[ Upstream Kernel Changes ]

  * x86/xen: don't copy bogus duplicate entries into kernel page tables
  * blk-merge: fix blk_recount_segments
    - LP: #1359146
  * igb: bring link up when PHY is powered up
    - LP: #1370018
  * igb: remove unnecessary break after goto
    - LP: #1370018
  * igb: remove unnecessary break after return
    - LP: #1370018
  * igb: Add message when malformed packets detected by hw
    - LP: #1370018
  * igb: bump igb version to 5.2.13
    - LP: #1370018
-- Tim Gardner <email address hidden> Tue, 16 Sep 2014 10:19:04 -0600

Changed in linux (Ubuntu Utopic):
status:	Fix Committed → Fix Released

Revision history for this message

Gannet (ken20001) wrote on 2014-09-18:

#15

Recently checked 3.16.3 on Trusty. No problems. All is ok. Сheers !

Mathew Hodson (mhodson) on 2014-10-10

Changed in linux (Ubuntu Trusty):
status:	Incomplete → Confirmed

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CONFIG_DMA_CMA causes ttm performance problems/hangs

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