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@xxxxxxxxx> 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@xxxxxxxxxxxxxxxxxxxxxxx > https://admin.fedoraproject.org/mailman/listinfo/arm _______________________________________________ arm mailing list arm@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/arm
