** Changed in: linux (Ubuntu Trusty)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1362261
Title:
CONFIG_DMA_CMA causes ttm performance problems/h
Recently checked 3.16.3 on Trusty. No problems. All is ok. Сheers !
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Title:
CONFIG_DMA_CMA causes ttm performance problems/hangs
St
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_BUIL
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).
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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.
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Title:
CONF
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
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Does CONFIG_DMA_CMA parameter enabled in 3.13.0-35 ? Because I have no
problem with it unlike 3.16+.
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Title:
CONFIG_DMA_CMA causes t
** Changed in: linux (Ubuntu Utopic)
Status: Triaged => Fix Committed
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Title:
CONFIG_DMA_CMA causes ttm performance problems/
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 th
Upstream discussion:
https://lkml.org/lkml/2014/8/8/445
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Title:
CONFIG_DMA_CMA causes ttm performance problems/hangs
Status in “lin
** Changed in: linux (Ubuntu Trusty)
Importance: Undecided => Medium
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Title:
CONFIG_DMA_CMA causes ttm performance problems/hangs
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1363384
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Title:
CONFIG_DMA_CMA causes ttm performance problems/hangs
Status in
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: linux (Ubuntu Trusty)
Status: New => Confirmed
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Overall the recommendation seems to be that this should be disabled on
x86.
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Title:
CONFIG_DMA_CMA causes ttm performance problems/h
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
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
** Changed in: linux (Ubuntu)
Status: Confirmed => Triaged
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