** 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/hangs
To mana
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
To manage notif
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:
CONFIG_DMA_CMA ca
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 ttm performanc
** Changed in: linux (Ubuntu Utopic)
Status: Triaged => Fix Committed
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Title:
CONFIG_DMA_CMA causes ttm performance problems/hangs
To man
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
To manage notifications abo
** Changed in: linux (Ubuntu Trusty)
Importance: Undecided => Medium
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Title:
CONFIG_DMA_CMA causes ttm performance problems/hangs
To manage n
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: linux (Ubuntu Trusty)
Status: New => Confirmed
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Title:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1363384
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Title:
CONFIG_DMA_CMA causes ttm performance problems/hangs
To manage notification
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
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/hangs
To mana
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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