> -----Original Message----- > From: Rich Freeman <ri...@gentoo.org> > Sent: Tuesday, April 5, 2022 11:59 AM > To: gentoo-user@lists.gentoo.org > Subject: Re: [gentoo-user] LVM and moving things around > > On Tue, Apr 5, 2022 at 11:10 AM Wols Lists <antli...@youngman.org.uk> wrote: > > > > I don't know how you take advantage of it, but linux by default caches > > disk i/o. You can tell it to "don't cache" and apparently it makes a > > major difference. Given that rsync reads once and then never uses it > > again, you don't want it cached. > > > > I suggest reading: > man posix_fadvise > https://insights.oetiker.ch/linux/fadvise/ > http://rdiez.shoutwiki.com/wiki/The_Linux_Filesystem_Cache_is_Braindead > https://lwn.net/Articles/806980/ > https://bugzilla.samba.org/show_bug.cgi?id=9560 > > There might be something more recent, but my overall impression is that this > problem is less solved than it probably ought to be. > > -- > Rich > I remember seeing something more with regard to "please cache/please discard/this can be immediately swapped because I won't need it for a while" stuff for like the 5.15 kernel or something, but the actual system programs will have to be updated to use it before it'll make any difference.
LMP
