[Samba] Samba 3.0.22 - slow performance - Really urgent help
christoph.beyer at desy.de
Thu Apr 1 05:32:02 MDT 2010
if you do 'truss -f -p <smbd-PID>' do you see a lot of:
19702: fcntl(17, F_SETLKW64, 0xFFBFE640) = 0
If yes this is a problem that is present in most of the recent samba versions
(tried 5 or 6 versions off the different branches) it's a solaris related bug
but that's all I can say. It might be fixed in 3.5.1 ...
On Thu, 1 Apr 2010, Volker Lendecke wrote:
> On Thu, Apr 01, 2010 at 06:22:34PM +0800, Alan Pek wrote:
> > a) Though the CPU utilisation is not high but there memory used and
> > swapped are very high. This will slow it down further.
> > b) Think every samba connection will consume a considerable amout of
> > memory as well.
> The rough estimate here is that Samba should have 2-3MB real
> RAM per client. If your smbds use a lot more, you might be
> hitting a memleak that might be fixed in later versions.
> 3.0.22 is very old, I would really recommend looking at
> 3.4.7 or 3.5.2 (next week).
> > c) We did a test, by saving a huge number of files onto local drive (on
> > enduser PC) and the copy into the mapped drives This is much faster,
> > probably by factor 6 or more, then using Excel marco
> > and writing directly into the samba share over NFS.
> Do you have oplocks disabled? This would severely impact
> performance. If you don't have concurrent NFS clients
> accessing the same data, you might also want to try
> posix locking = no
> > d) Looking at the system, and samba processes, how should I do a truss
> > with high-resolution timestamps on the smbd processes ? Every smbd process
> > ?
> > Just do :
> > truss -p 20995 without any option ?
> Not sure how truss really works, in Linux you would do a
> strace -ttT -p 20995 -o smbd.out
> You pick a single smbd with "smbstatus" and run your test.
> The truss output will need some interpretation though.
> > e) Network tracing , meaning application profiling by putting a sniffer,
> > or/and snoop on both samba and nfs side ?
> Yes. Best done on the samba server box itself.
> BTW, before you send stuff to the list -- both the truss and
> the network sniffer output will probably contain sensitive
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