On 8/4/23 15:42, Christoph Hellwig wrote:
FYI, I've found an arm64 system with 16k page size support, and while
I can't reproduce the exact issue, I do see corruption with I/O test
on zram that don't show on the same system with 4k pages. I'm trying
to understand the details at the moment.
For some reason zram run with a logical block size of 4k:
#define ZRAM_LOGICAL_BLOCK_SHIFT 12
#define ZRAM_LOGICAL_BLOCK_SIZE (1 << ZRAM_LOGICAL_BLOCK_SHIFT)
so we'll have sub-page accesses for larger page sizes.
My bet is that the issue goes away if we set the logical block size to
page size ...
Cheers,
Hannes
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