--- config-arm-generic | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/config-arm-generic b/config-arm-generic index c1bc653..27df69b 100644 --- a/config-arm-generic +++ b/config-arm-generic @@ -150,7 +150,7 @@ CONFIG_THERMAL_GOV_USER_SPACE=y CONFIG_CMA=y CONFIG_DMA_CMA=y # CONFIG_CMA_DEBUG is not set -CONFIG_CMA_SIZE_MBYTES=16 +CONFIG_CMA_SIZE_MBYTES=64 CONFIG_CMA_SIZE_SEL_MBYTES=y # CONFIG_CMA_SIZE_SEL_PERCENTAGE is not set # CONFIG_CMA_SIZE_SEL_MIN is not set
Why? You've provided no overview for this. What impact does it have on platforms such as the BeagleBoneBlack? Nor have you even cc:ed the ARM mailing list where this has impact.
Peter
On Wed, Jun 4, 2014 at 10:32 PM, Nicolas Chauvet kwizart@gmail.com wrote:
config-arm-generic | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/config-arm-generic b/config-arm-generic index c1bc653..27df69b 100644 --- a/config-arm-generic +++ b/config-arm-generic @@ -150,7 +150,7 @@ CONFIG_THERMAL_GOV_USER_SPACE=y CONFIG_CMA=y CONFIG_DMA_CMA=y # CONFIG_CMA_DEBUG is not set -CONFIG_CMA_SIZE_MBYTES=16 +CONFIG_CMA_SIZE_MBYTES=64 CONFIG_CMA_SIZE_SEL_MBYTES=y # CONFIG_CMA_SIZE_SEL_PERCENTAGE is not set
# CONFIG_CMA_SIZE_SEL_MIN is not set
1.7.2.1
kernel mailing list kernel@lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/kernel
The commit d1c912c1001f was made into tegra_defconfig and later forwared to multi_v7_deconfig as 0c86f089e66a93
Quoting original commit into the kernel tree: - Allocate 64 MiB for CMA by default; the default 16MiB is not enough for the majority of use-cases. This can still be overridden by the cma command-line option.
If this patch is not applied, KMS drivers using CMA would rapidly exhaust the allocated memory. This was seen on tegra_drm (from tagr libdrm/opentegra with exa support on freedesktop.org) ... kernel: host1x drm: failed to allocate buffer with size 2457600 ...
On the other side, CMA allocated memory can easily be freed http://lwn.net/Articles/486301/ "Freeing memory is much simpler process..." Whereas they can only be allocated at boot time https://lkml.org/lkml/2014/5/7/810 "CMA is introduced to provide physically contiguous pages at runtime. For this purpose, it reserves memory at boot time."
This patch is about to have a convenient generic default and to match upstream kernel default value. Everything can be setup back into fedora tools such as arm-boot-config
At some point, tegra revisions that can support IOMMU will not rely on CMA. This is not the case for tegra20
Tested on Toshiba AC100 (with 512M RAM with cma=128M zram=1x128M) with opentegra DDX driver --- config-arm-generic | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/config-arm-generic b/config-arm-generic index 0c5242c..158ea5c 100644 --- a/config-arm-generic +++ b/config-arm-generic @@ -162,7 +162,7 @@ CONFIG_THERMAL_GOV_USER_SPACE=y CONFIG_CMA=y CONFIG_DMA_CMA=y # CONFIG_CMA_DEBUG is not set -CONFIG_CMA_SIZE_MBYTES=16 +CONFIG_CMA_SIZE_MBYTES=64 CONFIG_CMA_SIZE_SEL_MBYTES=y # CONFIG_CMA_SIZE_SEL_PERCENTAGE is not set # CONFIG_CMA_SIZE_SEL_MIN is not set
NACK. See https://bugzilla.redhat.com/show_bug.cgi?id=1127000 for details.
Peter
On Mon, Aug 4, 2014 at 7:56 PM, Nicolas Chauvet kwizart@gmail.com wrote:
The commit d1c912c1001f was made into tegra_defconfig and later forwared to multi_v7_deconfig as 0c86f089e66a93
Quoting original commit into the kernel tree:
- Allocate 64 MiB for CMA by default; the default 16MiB is not enough for the majority of use-cases. This can still be overridden by the cma command-line option.
If this patch is not applied, KMS drivers using CMA would rapidly exhaust the allocated memory. This was seen on tegra_drm (from tagr libdrm/opentegra with exa support on freedesktop.org) ... kernel: host1x drm: failed to allocate buffer with size 2457600 ...
On the other side, CMA allocated memory can easily be freed http://lwn.net/Articles/486301/ "Freeing memory is much simpler process..." Whereas they can only be allocated at boot time https://lkml.org/lkml/2014/5/7/810 "CMA is introduced to provide physically contiguous pages at runtime. For this purpose, it reserves memory at boot time."
This patch is about to have a convenient generic default and to match upstream kernel default value. Everything can be setup back into fedora tools such as arm-boot-config
At some point, tegra revisions that can support IOMMU will not rely on CMA. This is not the case for tegra20
Tested on Toshiba AC100 (with 512M RAM with cma=128M zram=1x128M) with opentegra DDX driver
config-arm-generic | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/config-arm-generic b/config-arm-generic index 0c5242c..158ea5c 100644 --- a/config-arm-generic +++ b/config-arm-generic @@ -162,7 +162,7 @@ CONFIG_THERMAL_GOV_USER_SPACE=y CONFIG_CMA=y CONFIG_DMA_CMA=y # CONFIG_CMA_DEBUG is not set -CONFIG_CMA_SIZE_MBYTES=16 +CONFIG_CMA_SIZE_MBYTES=64 CONFIG_CMA_SIZE_SEL_MBYTES=y # CONFIG_CMA_SIZE_SEL_PERCENTAGE is not set
# CONFIG_CMA_SIZE_SEL_MIN is not set
1.7.2.1
arm mailing list arm@lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/arm
kernel@lists.fedoraproject.org
-
Nicolas Chauvet -
Peter Robinson