Monumentally slow directory performance.

[Jaye Mathisen]

I know.  if I start off with an empty dir, it goes really really fast
until I get around 2000-2500 or so.  And then it just gets slower and
slower.

If it's samba, I have no idea what.  I'm running a current samba, 
pretty much the default config.  On large files I see 12-13MB/second.  

If my switch supported jumbo frames I'm sure it'd be even faster.

I'll do some of the tests from the command prompt, see if I see the same thing.


On Sat, Apr 10, 2004 at 11:38:35AM -0400, Brian F. Feldman wrote:
> Jaye Mathisen <mrcpu at internetcds.com> wrote:
> > 
> > 
> > Running a 5.2 supped as of 4/9.
> > 
> > I have the UFS_DIRHASH stuff compiled into my kernel.  Is there some other
> > frob to actually "turn" it on?
> > 
> > I run softupdates, and moving files from my local box over gig ethernet to a directory
> > with 5000 files in it is moving about 1 file every 6-7 seconds.
> > 
> > If I move the same files to an empty directory, they move so fast I can' even
> > read the names, which is more "normal".
> > 
> > Even directories with 2500 or so files seem really, really, really, really slow.
> > at least for adding/removing.
> > 
> > My FS is UFS2, on a 3ware RAID controller.  I would love any ideas.  smbd 
> > is burning up 60-70% of the CPU, I've tried kernels with and without all
> > the witness/diagnostic and all that stuff.
> 
> Burning up 60-70% of the CPU?  Just writing a file every 6-7 seconds to a 
> pretty small directory?
> 
> {"/home/green"}$ ls Mail/current | wc -l
>    64109
> {"/home/green"}$ date; touch Mail/current/rand$RANDOM;\
> > date; touch Mail/current/rand$RANDOM; date
> Sat Apr 10 11:37:55 EDT 2004
> Sat Apr 10 11:37:55 EDT 2004
> Sat Apr 10 11:37:55 EDT 2004
> 
> You should be getting "many" a second.  Samba must be doing something wrong/
> stuck on something.
> 
> -- 
> Brian Fundakowski Feldman                           \'[ FreeBSD ]''''''''''\
>   <> green at FreeBSD.org                               \  The Power to Serve! \
>  Opinions expressed are my own.                       \,,,,,,,,,,,,,,,,,,,,,,\
> 
> 
> 
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