Re: [LSF/MM TOPIC] More async operations for file systems - async discard?

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Keith,

> With respect to fs block sizes, one thing making discards suck is that
> many high capacity SSDs' physical page sizes are larger than the fs
> block size, and a sub-page discard is worse than doing nothing.

That ties into the whole zeroing as a side-effect thing.

The devices really need to distinguish between discard-as-a-hint where
it is free to ignore anything that's not a whole multiple of whatever
the internal granularity is, and the WRITE ZEROES use case where the end
result needs to be deterministic.

-- 
Martin K. Petersen	Oracle Linux Engineering



[Index of Archives]     [XFS Filesystem Development (older mail)]     [Linux Filesystem Development]     [Linux Audio Users]     [Yosemite Trails]     [Linux Kernel]     [Linux RAID]     [Linux SCSI]


  Powered by Linux