[Samba] Performance issue on AIX when deleting files in a directory with a large number of files

[William Jojo]

----- Original Message ----- 
From: "Claus Lund" <clund at tax.state.vt.us>
To: "William Jojo" <jojowil at hvcc.edu>; "Jeremy Allison" <jra at samba.org>
Cc: <ericew at gmail.com>; <samba at lists.samba.org>
Sent: Wednesday, May 10, 2006 2:29 PM
Subject: RE: [Samba] Performance issue on AIX when deleting files in a
directory with a large number of files


> Hi Bill,
>
> I already tried updating AIX.
> I'm on 5300-04 (only a couple of security related fixes added since the
tech
> level) on my production box (we're using Samba 3.0.21a on that box). And
I'm
> on the latest Technology Level + all the latest fixes on my test box (and
> that's where I currently have 3.0.22).
>
> Both machines are setup with JFS2 and neither use inline logs.
>
> I am not all that familar with debugging tools like truss (I haven't
really
> done any real programming since my college days ... 6-7 years ago). But I
> just ran:
> truss -f -o /datavg/smb_truss.out /opt/Samba/3.0.22/sbin/smbd -D
>
> I used Windows Explorer to browse to my test directory (with about 30K
files
> in it), highlighted all the files and hit delete. I let it delete a few
> files and then cancelled. The truss file is about 185MB (4MB zipped). Do
you
> have a place where I can upload that?
>

You can mail me the zip directly off-list, unless Jeremy or Volker wish to
look at it as well...


Bill

> -Claus
>
> > > >
> > > > But the nfs or local access isn't performing the same access pattern
> > > > that Samba is by being driven by the client. I'm guessing that if
you
> > > > performed the same actions locally that the client is requesting
> > > > Samba perform you'd get the same results (in fact you *must* - as
> > > > all of Samba is userspace, there's no magic in what Samba is doing
> > > > here - it's doing what the client requests from userspace).
> > > >
> > > > My money is still on the kernel, as driven in this access pattern.
> > > >
> > >
> > > Yep. I'd be curious what a truss of a smbd process shows for access on
> > that
> > > filesystem.
> > >
> > > Is this jfs2 using an inline log? Just curious...
> > >
> >
> > Claus, can you run "oslevel -r" and send me the results. I think this
may
> > have been fixed in 5300-03.
> >
> > 5300-04-3 is available, I'd consider that as well...
> >
> >
> > Cheers,
> >
> > Bill
> >
>
>