saslauthd performance

[Axel Grupe]

Hi,

I got performance problems with saslauth daemon. I`m using debian with 
cyrus 2.1.16 and saslauthd 2.1.19 for authentication.
The saslauthd is configured to use pam, which itself uses mysql for  
password-verification.

I test the system with 50 perl-script in the background from another 
machine, which makes continuous pop3-connections to my server.

So, the problem is, if I just take one user for the 
perl-authentification-test,  cyrus or better the saslauthd can handle up 
to 7000 queries per minute.
But, if there isn`t only one user but rather 45.000 users, which will be 
connected through the perl-scripts. The performance goes down to ~1000 
queries per minute.
I don`t think this causes of pam or mysql, because if saslauthd uses 
directly ldap (just al little test of me) saslauthd just handles the 
same (~1000) queries per minute.

Another test: if I use auxprop in cyrus with mysql, it goes at least 
down to 150 queries per minute.

I fixed some params of saslauthd like -c, -n (0), -t  ... but it didn`t 
get fast!!!

So has anyone an idea?


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