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Login slowdown [was: Problems with LILO and login]

After a private discussion 2 points which together could
significantly speed things up was found.

The first point is to don't forget remove all mentions of NIS
from /etc/nsswitch.conf (and from /etc/pwdb.conf).

The second point is to use pam_unix_* PAM modules instead of pam_pwdb.so.
Traces show that the search in /etc/passwd done by pwdb consumes CPU very much.
I've got figures how much time pwdb spends in different places.
If somebody is interested I can mail the figures to him.

					Andrey V.

[Note: Please Cc: me followups in redhat-devel list]

> Date: Wed, 4 Mar 1998 17:55:58 +0200 (EET)
> From: "F. Kagan Guerkaynak" <kgf@ehb.itu.edu.tr>
> Reply-To: redhat-devel-list@redhat.com
> To: redhat-devel-list@redhat.com
> Subject: Problems with LILO and login
> Resent-Date: 4 Mar 1998 15:51:58 -0000
> Resent-From: redhat-devel-list@redhat.com
> Resent-cc: recipient.list.not.shown:;
> Login seems to be consuming very much CPU and Memory. I have a test bed
> with 10000 users. Users who have passwd entries to the top of the
> /etc/passwd are lucky :-) they can login, but on a low end pentium users
> at the back of the list can not login, the process takes more than 60
> seconds !!!
> I have verified this on different systems, with all the patches and
> upgrades installed. Problem first occured on a students server (with app
> 2000 users) that had been upgraded from 4.2 to 5.0. We need to have a few
> K users, and need to accept 10-50 connections at a given time.. any
> suggestions ? Is there something we are missing ?

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