29 Nov
2022
29 Nov
'22
4:38 a.m.
On (22/11/22 16:07), Petr Vorel wrote:
On 11. 11. 22 1:48, Sergey Senozhatsky wrote:
On (22/11/10 15:29), Martin Doucha wrote:
[..]
Can you try using /dev/urandom for dd, not /dev/zero? Do you still see zeroes in sysfs output or some random values?
After 50 test runs on a kernel where the issue is confirmed, I could not reproduce the failure while filling the device from /dev/urandom instead of /dev/zero. The test reported compression ratio around 1.8-2.5 which means the memory usage reported by mm_stat was 10-13MB.
Martin, thanks a lot for reruning tests. I wonder problems on /dev/zero is a kernel bug or just problem which should be workarounded.
Hmm. Does CONFIG_KASAN show anything interesting?