Re: btrfs: poor performance on deleting many large files

[Christoph Anton Mitterer <calestyo@scientia.net>]

[-- Attachment #1: Type: text/plain, Size: 850 bytes --]

On Mon, 2015-12-14 at 15:27 -0500, Austin S. Hemmelgarn wrote:
> On 2015-12-14 14:39, Christoph Anton Mitterer wrote:
> > On Mon, 2015-12-14 at 09:24 -0500, Austin S. Hemmelgarn wrote:
> > > Unless things have changed very recently, even many modern
> > > systems
> > > update atime on read-only filesystems, unless the media itself is
> > > read-only.
> > Seriously? Oh... *sigh*...
> > You mean as in Linux, ext*, xfs?
> Possibly, I know that Windows 7 does it, and I think OS X and OpenBSD
> do 
> it, but I'm not sure about Linux.
I've just checked it via loopback image and strictatime:

- ro snapshot doesn't get atime updated
- rw snapshot does atime get update
- ro mounted fs (top level subvol) doesn't get atimes updated (neither
  in subvols)
- rw mounted fs (top level subvol) does get atimes updated

Cheers,
Chris.

[-- Attachment #2: smime.p7s --]
[-- Type: application/x-pkcs7-signature, Size: 5313 bytes --]