Darn, please ignore the previous message -- didn't mean to send, was working on a draft, meant to save as a draft instead of send.
(Of course, if you want to reply, feel free.) On Friday, June 11, 2021 11:01:40 AM rhkra...@gmail.com wrote: > On Friday, June 11, 2021 02:49:03 AM Reco wrote: > > On Thu, Jun 10, 2021 at 11:43:12PM -0700, David Christensen wrote: > > > I don't bother with the 'discard' option in /etc/fstab, but perhaps I > > > should. The fstab(5) and mount(8) manual pages are unclear if > > > 'discard' applies to swap or ext4. > > > > swapon(8): > > -d, --discard[=policy] > > > > Enable swap discards ... The /etc/fstab mount options discard, > > > > discard=once, or discard=pages may also be used to enable discard flags. > > So, I'm not clear on what happens if you don't use the discard option. I > assume that the data in swap is swapped back (written back) to the proper > location in RAM before reusing the swap space, which would be unnecessary > if the > > > -d, --discard > Discard freed swap pages before they are reused, if the swap > device supports the discard or trim operation. This may improve > performance on some Solid State Devices, but often it does not. > The /etc/fstab mount option discard may be also used to enable discard > flag.
