Public bug reported:
[Impact]
Running the current armhf raspi kernel on Pi 3 and 2 results in wasting
~70MB of memory because of LPAE, HIGHMEM and VMSPLIT_3G. That's a
significant waste of memory particularly on a Pi 3A+ which only has
512MB to begin with. Additionally, with HIGHMEM enabled, CMA memory is
allocated from the highmem zone which is too small to provide the
default 256MB for CMA.
[Test Case]
On a Pi 3B:
$ dmesg | grep cma-reserved
[0.000000] Memory: 778696K/970752K available (12288K kernel code, 821K rwdata,
4088K rodata, 2048K init, 786K bss, 126520K reserved, 65536K cma-reserved,
118784K highmem)
[Regression Potential]
There should be no impact to users of the current flavor, which
continues to be the default (for now).
** Affects: linux-raspi (Ubuntu)
Importance: Undecided
Status: Triaged
** Affects: linux-raspi (Ubuntu Groovy)
Importance: Undecided
Status: Triaged
** Package changed: linux-raspi2 (Ubuntu) => linux-raspi (Ubuntu)
** Also affects: linux-raspi (Ubuntu Groovy)
Importance: Undecided
Status: New
** Changed in: linux-raspi (Ubuntu Groovy)
Status: New => Triaged
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Packages, which is subscribed to linux-raspi2 in Ubuntu.
https://bugs.launchpad.net/bugs/1896761
Title:
Provide a raspi-nolpae kernel flavor
Status in linux-raspi package in Ubuntu:
Triaged
Status in linux-raspi source package in Groovy:
Triaged
Bug description:
[Impact]
Running the current armhf raspi kernel on Pi 3 and 2 results in
wasting ~70MB of memory because of LPAE, HIGHMEM and VMSPLIT_3G.
That's a significant waste of memory particularly on a Pi 3A+ which
only has 512MB to begin with. Additionally, with HIGHMEM enabled, CMA
memory is allocated from the highmem zone which is too small to
provide the default 256MB for CMA.
[Test Case]
On a Pi 3B:
$ dmesg | grep cma-reserved
[0.000000] Memory: 778696K/970752K available (12288K kernel code, 821K
rwdata, 4088K rodata, 2048K init, 786K bss, 126520K reserved, 65536K
cma-reserved, 118784K highmem)
[Regression Potential]
There should be no impact to users of the current flavor, which
continues to be the default (for now).
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux-raspi/+bug/1896761/+subscriptions
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