Note that in current disco things have gotten worse - our single page
allocations have blown up to 11753:
$ cat cma.disco.dmesg | grep "cma: cma_alloc(cma" | sed -r 's/.*count
([0-9]+)\,.*/\1/' | sort -n | uniq -c
11753 1
3 2
3 4
234 8
32 16
2 24
4 32
256 33
39 64
2 128
2 1024
I bisected this down to a backport of the following commit:
3e394f9413ec RDMA/hns: Modify qp&cq&pd specification according to UM
Reverting that gets us down to 3029 single page allocations, freeing up
about 34M.
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https://bugs.launchpad.net/bugs/1823753
Title:
arm64: cma_alloc errors at boot
Status in linux package in Ubuntu:
Confirmed
Bug description:
On some arm64 systems[*] we are seeing a spew of messages on the
console:
[ 19.534097] cma: cma_alloc: alloc failed, req-size: 64 pages, ret: -12
[ 19.534109] cma: cma_alloc: alloc failed, req-size: 16 pages, ret: -12
[ 19.534113] cma: cma_alloc: alloc failed, req-size: 64 pages, ret: -12
[ 19.534126] cma: cma_alloc: alloc failed, req-size: 16 pages, ret: -12
[ 19.534130] cma: cma_alloc: alloc failed, req-size: 64 pages, ret: -12
[ 19.534142] cma: cma_alloc: alloc failed, req-size: 16 pages, ret: -12
[ 19.534146] cma: cma_alloc: alloc failed, req-size: 64 pages, ret: -12
[ 19.534157] cma: cma_alloc: alloc failed, req-size: 16 pages, ret: -12
[ 19.534161] cma: cma_alloc: alloc failed, req-size: 64 pages, ret: -12
[ 19.534173] cma: cma_alloc: alloc failed, req-size: 16 pages, ret: -12
[ 19.534177] cma: cma_alloc: alloc failed, req-size: 64 pages, ret: -12
This appears to be non-fatal - impacted systems all eventually boot.
But, at least in the case of the HP m400, it slows down boot enough
that MAAS' default timeout will expire before completing deployment.
[*] Observed on a HiSilicon D06 w/ SMMU disabled in the BIOS, as well
as an HP m400 (APM X-Gene) cartridge - although, not on another one
that - in theory - should be identical.
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