I used ext4 and set the blocksize to 4096, the mount command was silent. Does it indicate that dax has already been enabled?
2015-12-24 10:47 GMT+08:00 Elliott, Robert (Persistent Memory) <elliott@xxxxxxx>:
> -----Original Message-----
> From: Cholerae Hu [mailto:choleraehyq@xxxxxxxxx]
> Sent: Wednesday, December 23, 2015 8:36 PM
> Subject: Re: A blocksize problem about dax and ext4
...
> xfs will silently disable dax when the fs block size is too small,
> i.e. your mmap() operations are backed by page cache in this case.
> Currently the only indication of whether a mapping is DAX backed or
> not is the presence of the VM_MIXEDMAP flag ("mm" in the VmFlags field
> of /proc/<pid>/smaps)
>
> Did you mean that I should make the blocksize bigger until the mount
> command tell me that dax is enabled?
To really use DAX, the filesystem block size must match the
system CPU's page size, which is probably 4096 bytes.
---
Robert Elliott, HPE Persistent Memory
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