uid/gid lookups slower on 6.2 than 4.x?

[Max Laier]

On Wednesday 11 April 2007 01:19, Scott Lambert wrote:
> I've run into an interesting performance "issue" with ls on a
> 6.2-STABLE box, web1.  This box is going to replace my current 4.11
> box, ns, and is not currently active.  It's running all the daemons it
> will be in production, but traffic is not pointed at it yet.
>
> I don't think the gmirror vs. adaptec RAID disk subsystem would explain
> the performance differences.  I could be wrong.  If I am, I'm going to
> have to get a RAID card for the new box.
>
> root at web1 /home
> 17:58:57 Tue Apr 10 # time ls -l | wc -l
>     3135
>
> real    0m35.224s
> user    0m6.748s
> sys     0m28.482s
...
> root at web1 /home
> 18:01:13 Tue Apr 10 #  uname -a
> FreeBSD web1.hosting.tcworks.net 6.2-STABLE-200702 FreeBSD
> 6.2-STABLE-200702 #0: Sun Feb  4 13:35:09 UTC 2007    
> root at dessler.cse.buffalo.edu:/usr/obj/usr/src/sys/SMP  i386
>
> root at web1 /home
> 18:03:38 Tue Apr 10 # time ls -ln | wc -l
>     3135
>
> real    0m0.054s
> user    0m0.030s
> sys     0m0.031s

Well, with nsswitch things are a bit more difficult.  If you don't need 
it, you can just use nsswitch.conf to turn it off for passwd/group.  
Otherwise, you'll have to look at MFCing cached(8) from current.

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