----- Original Message -----
From: "Scott Lambert" <[EMAIL PROTECTED]>
To: "FreeBSD STABLE" <[email protected]>
Sent: Wednesday, April 11, 2007 1:19 AM
Subject: uid/gid lookups slower on 6.2 than 4.x?
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.
[EMAIL PROTECTED] /home
17:58:57 Tue Apr 10 # time ls -l | wc -l
3135
real 0m35.224s
user 0m6.748s
sys 0m28.482s
[EMAIL PROTECTED] /home
17:59:48 Tue Apr 10 # time ls -l | wc -l
3135
real 0m35.279s
user 0m6.939s
sys 0m28.348s
[EMAIL PROTECTED] /home
18:00:37 Tue Apr 10 # time ls -l | wc -l
3135
real 0m35.203s
user 0m6.640s
sys 0m28.569s
[EMAIL PROTECTED] /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
[EMAIL PROTECTED]:/usr/obj/usr/src/sys/SMP i386
[EMAIL PROTECTED] /home
18:03:38 Tue Apr 10 # time ls -ln | wc -l
3135
real 0m0.054s
user 0m0.030s
sys 0m0.031s
[EMAIL PROTECTED] /home
18:04:53 Tue Apr 10 # time ls -ln | wc -l
3135
real 0m0.054s
user 0m0.046s
sys 0m0.014s
[EMAIL PROTECTED] /home
18:04:54 Tue Apr 10 # time ls -ln | wc -l
3135
real 0m0.054s
user 0m0.037s
sys 0m0.024s
The difference in the number of home directories is due to my rsync
script not using the --delete option, yet.
Here are the same statistics from my 4.11 box. This box is in
production with the same daemons as the web1 box. :
[EMAIL PROTECTED] /home
18:04:38 Tue Apr 10 # time ls -l | wc -l
3070
real 0m0.113s
user 0m0.041s
sys 0m0.050s
[EMAIL PROTECTED] /home
18:04:41 Tue Apr 10 # time ls -l | wc -l
3070
real 0m0.096s
user 0m0.037s
sys 0m0.053s
[EMAIL PROTECTED] /home
18:04:41 Tue Apr 10 # time ls -l | wc -l
3070
real 0m0.099s
user 0m0.046s
sys 0m0.046s
[EMAIL PROTECTED] /home
18:04:44 Tue Apr 10 # uname -a
FreeBSD ns 4.11-RELEASE-p21 FreeBSD 4.11-RELEASE-p21 #2: Thu Sep 21
00:53:20 CDT 2006 [EMAIL PROTECTED]:/usr/obj/usr/src/sys/NS i386
[EMAIL PROTECTED] /home
18:09:38 Tue Apr 10 # time ls -ln | wc -l
3070
real 0m0.055s
user 0m0.030s
sys 0m0.023s
[EMAIL PROTECTED] /home
18:10:20 Tue Apr 10 # time ls -ln | wc -l
3070
real 0m0.055s
user 0m0.031s
sys 0m0.022s
[EMAIL PROTECTED] /home
18:10:21 Tue Apr 10 # time ls -ln | wc -l
3070
real 0m0.059s
user 0m0.041s
sys 0m0.012s
--
Scott Lambert KC5MLE Unix
SysAdmin
[EMAIL PROTECTED]
First thing to check is if the RAID card has onboard cache. I've found RAID
cards to cache things like this and make the array appear incredibly fast.
You haven't said which RAID card you are using but if it's an Adaptec I'm
pretty sure it has some amount of onboard cache.
-Clay
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