Re: [gentoo-user] "Amount" of fstrim? (curiosity driven, no paranoia :)

[antlists <antlists@youngman.org.uk>]

On 27/04/2020 17:59, Rich Freeman wrote:
> Really though a better solution than any of this is for the filesystem
> to be more SSD-aware and just only perform writes on entire erase
> regions at one time.  If the drive is told to write blocks 1-32 then
> it can just blindly erase their contents first because it knows
> everything there is getting overwritten anyway.  Likewise a filesystem
> could do its own wear-leveling also, especially on something like
> flash where the cost of fragmentation is not high.  I'm not sure how
> well either zfs or ext4 perform in these roles.  Obviously a solution
> like f2fs designed for flash storage is going to excel here.

The problem here is "how big is an erase region". I've heard comments 
that it is several megs. Trying to consolidate writes into megabyte 
blocks is going to be tricky, to say the least, unless you're dealing 
with video files or hi-res photos - I think the files my camera chucks 
out are in the 10MB region ... (24MP raw...)

Cheers,
Wol