On Thu, Apr 11, 2024 at 04:15:19PM +0200, Claudio Jeker wrote:
> On Thu, Apr 11, 2024 at 03:36:29PM +0200, Federico Giannici wrote:
> > On 4/11/24 14:12, Nick Holland wrote:
> > > On 4/11/24 05:47, Federico Giannici wrote:
> > > > We have a server with A LOT of files in some directories (an email
> > > > server in maildir format).
> > > >
> > > > Since we upgraded from OpenBSD amd64 7.3 to 7.5 (passing through 7.4) it
> > > > became very very very slow to access these large directories!
> > > ,,,
> > > You may be being bitten by the removal of softdeps (soft updates)
> > > in 7.4 more than the availability of a knob to twist. This was a
> > > huge hit for some things -- I had one backup job go from a couple
> > > hours to eight or so hours. However, it turned out that increase
> > > in time has not inconvenienced me at all, and some random lockups
> > > related to softdeps have gone away. Overall, win for me (the
> > > fscks after a lockup took hours, too, not to mention all the time
> > > and effort spent replacing part after part assuming it was a HW
> > > issue).
> > >
> > > As I understand it...there were known (known unknown?) bugs in the
> > > softdep code, the code was ugly, and it made it difficult to
> > > actually improve the code.
> >
> > No, we knew that softdeps were being deprecated and we removed from
> > everywhere some time ago. It must be something else.
> >
> > Anyway, it's strange that dirhash parameters has being changed and removed
> > without any mention...
>
> It was not (this is on -current amd64):
> vfs.ffs.dirhash_dirsize=2560
> vfs.ffs.dirhash_maxmem=5242880
> vfs.ffs.dirhash_mem=4832510
>
> Are you sure your kernel and userland are in sync?
> --
> :wq Claudio
>
Strange, on a very recent snap:
$ sysctl | grep ffs.d
vfs.ffs.dirhash_maxmem=2560
vfs.ffs.dirhash_mem=5242880
$
-Otto
