[Bug 297297] smbd shows 400-600MB RSS per process in top

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D297297

--- Comment #2 from Ronin Carter <[email protected]> ---
Created attachment 273486
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D273486&action=
=3Dedit
The patch disables per-hash-bucket robust mutexes for Samba's volatile TDBs=
 on
FreeBSD

  Two changes, both FreeBSD-only (#ifdef __FreeBSD__), zero impact on Linux:

  1. source3/lib/dbwrap/dbwrap_open.c =E2=80=94 default try_mutex to false =
in
db_open(), so the six volatile SMB TDBs (brlock, leases, locking,
smbXsrv_open/session/tcon_global) no longer set TDB_MUTEX_LOCKING (~60k
     mutexes). Still overridable via the existing dbwrap_tdb_mutexes smb.co=
nf
param.
  2. source3/lib/gencache.c =E2=80=94 drop the default gencache:hash_size f=
rom 10000 to
131, since gencache hardcodes TDB_MUTEX_LOCKING and can't be turned off (~1=
0k
mutexes).

  Measured effect on the affected host (Samba 4.23.8, FreeBSD 15.0): smbd
parent RSS 585MB =E2=86=92 52MB, ~70,460 =E2=86=92 133 shared 4KB mappings,=
 SMB shares verified
working.

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