| 1 |
> -----Original Message----- |
| 2 |
> From: Rich Freeman <rich0@g.o> |
| 3 |
> Sent: Tuesday, April 5, 2022 11:59 AM |
| 4 |
> To: gentoo-user@l.g.o |
| 5 |
> Subject: Re: [gentoo-user] LVM and moving things around |
| 6 |
> |
| 7 |
> On Tue, Apr 5, 2022 at 11:10 AM Wols Lists <antlists@××××××××××××.uk> wrote: |
| 8 |
> > |
| 9 |
> > I don't know how you take advantage of it, but linux by default caches |
| 10 |
> > disk i/o. You can tell it to "don't cache" and apparently it makes a |
| 11 |
> > major difference. Given that rsync reads once and then never uses it |
| 12 |
> > again, you don't want it cached. |
| 13 |
> > |
| 14 |
> |
| 15 |
> I suggest reading: |
| 16 |
> man posix_fadvise |
| 17 |
> https://insights.oetiker.ch/linux/fadvise/ |
| 18 |
> http://rdiez.shoutwiki.com/wiki/The_Linux_Filesystem_Cache_is_Braindead |
| 19 |
> https://lwn.net/Articles/806980/ |
| 20 |
> https://bugzilla.samba.org/show_bug.cgi?id=9560 |
| 21 |
> |
| 22 |
> There might be something more recent, but my overall impression is that this problem is less solved than it probably ought to be. |
| 23 |
> |
| 24 |
> -- |
| 25 |
> Rich |
| 26 |
> |
| 27 |
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.
|
| 28 |
|
| 29 |
LMP |
Archives