Issue's with socketmap (smmapd) under heavy load?

[Andrzej Filip]

Lenny wrote:
> I did 2 things to try and see if this was ident related. First, I 
> installed an
> identd server on each frontend and backend.
> 
> That had a huge affect on my pop login times, by the way, although I'm 
> unsure
> why (for the better, that is). Unfortunately, once there were at least 100
> sendmails going mail delivery still took over 30 seconds per message.
> 
> The second thing I tried was out of the sendmail.org faq. I added the 
> following
> to my .mc file and remade sendmail.cf:
> 
>  define(`confTO_IDENT',`0s')dnl
> 
> This doesn't seem to have had any affect either. :( All strace's still show
> waiting for the socketmap socket. Is there any further debugging I could do
> besides an strace that might help point me in the right direction?

Have you checked if your sendmail is compiled with TCPWRAPPERS ?
[ RedHat does it ]
confTO_IDENT controls sendmail ident query, liwrap ident queries are unafected 
by the setting.

BTW you cyrus may hit limit on number of open files desciptors [open files 
(-n) 1024], sendmail keeps one "socket map" session opened per per one active 
SMTP session. Try to increase limit of open file descriptors to 2048 and check 
if it makes the difference.

> Quoting Andrzej Filip <anfi at priv.onet.pl>:
>> 30s delay make ident query the primary suspect.
>>
>> 1) Take a look at the link below
>> http://www.sendmail.org/faq/section3.html#3.12
>> Q3.12 -- Why do connections to the SMTP port take such a long time?
>>
>> 2) Check if you sendmail is compiled with TCPWRAPPERS
>> echo "" | sendmail -bt -d0.1 | grep TCP
>>
>> TCPWRAPPERS uses external library which does its own ident lookups.


-- 
Andrzej [en:Andrew] Adam Filip anfi at priv.onet.pl anfi at xl.wp.pl
http://anfi.homeunix.net/   http://anfi.homeunix.net/sendmail/#cyrus
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