On Fri, 12 Sep 2025 11:43:32 +0100 void <[email protected]> wrote: > On Fri, Sep 12, 2025 at 01:20:08PM +0900, Tatsuki Makino wrote: > >Hello. > > > >By the way, is it unpopular these days to use mdconfig to use a normal > >regular file as swap space? > >However, despite the fact that I brought up the topic of that method, I have > >never actually used it myself, so it seems that the method is unpopular :) > > Useful to make extra swap space on-the-fly. I've used it on occasion > to add swap space. But it's best added to the fastest media, like > ssd. Adding it to a spinning rust ufs is slower. It's not really > suitable to add to a zfs filesystem in my experience. > --
To do so, large enough spare real memory to handle filesystem (and/or zvol) operations even on thrashing situations is mandatory. And if the filesystem which the swap file to be created is severely fragmented, more real memory compared with non-fragmented filesystems would be needed. -- Tomoaki AOKI <[email protected]>
