Re: qmail hangs for while

>> 
>> Lampa wrote:
>> > Hello,
>> >
>> > i'm using toaster 0.8.3. Sometimes (one per
week) i have problem that
>> > my server hangs for minute or two. I've limit
50 connections for smtpd
>> > (local 20 and remote 10), all 50 connections
are used. Server load is
>> > about 50 - 100 and mostly is not responding. I
setup connections limit
>> > (timeoutconnect - 20, timeoutremote - 60,
timeoutsmtpd - 60) it helps
>> > little (dropping spammers and peple who only
block free connections).
>> > Computer is core duo 2 6400 2.13GHz
with 2G ram. Emails are on
>> > separate disc. Discs are sata with sw raid
(mirror) using reiserfs
>> > (need migrate to xfs). There is nothing
unusual in logs (except no
>> > activity for minute or two) - no errors, qmail
is accepting
>> > connections.
>> >
>> > After this "timeout" spamassassin
takes long time to process emails.
>> >
>> > Where can be problem ? Weak CPU, bad power
source, bad settings ?
>> >
>> > Qmail is compiled with conf-spawn = 509,
conf-split=101. Qmail-scanner
>> > using st patch, using fast spamassassin.
Spamassassin is 3.2.1. OS
>> > Debian testing
>> >
>> > Any advices welcome, thank you or help.
>> >
>> > Lampa
>> >   
>> Try upping your concurrency for SMTP... with your
hardware, 100 SMTP 
>> connections should not be a problem.
>> First: check your logs and determine your highest
local slot usage. With 
>> this in mind,
>> 20 local connections maybe is too much, since these
are done really 
>> fast, try with 10 or even 5...
>> 10 remote connections is way too little, these can
take a lot of time to 
>> complete depending on how much bandwidth you have
available. What is the 
>> size of your queue? If you have a lot of messages
in your queue raising 
>> from 10 to 20 (or even 40) connections will help a
lot!

with qmail-scanner, this means that the given number of
remote connections may be
in the scanning phase simultaneously. If you have antivirus
or spamassassin as part
of your scanning, make sure that the memory footprint of
these processes does
not exceed actual RAM

Wolfgang





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Hello,

spamassassin and clamav are parts of scanning, eg should
be:
qmail-smtpd->qmail-scanner|qmail-queue(for some
hosts)->deliver

But there is no message from kernel not enough memory. But
i'm
checking each 10 minutes system resource (free) 9:10 is
before 9:20 is
after (proble was about 9:14 - 9:18)

05.10.07 09:10:
             total       used       free     shared   
buffers     cached
Mem:       2061020    1943956     117064          0    
111824     544656
Swap:      3951968     102616    3849352
05.10.07 09:20:
             total       used       free     shared   
buffers     cached
Mem:       2061020    1172144     888876          0     
69752     175092
Swap:      3951968     745208    3206760

Looks that was missing memory perhaps (starts using swap
from 100M -> 740M)

5 Oct 2007 17:59:31 -0000, hamann.wt-online.de
<hamann.wt-online.de>:
> >>
> >> Lampa wrote:
> >> > Hello,
> >> >
> >> > i'm using toaster 0.8.3. Sometimes (one
per week) i have problem that
> >> > my server hangs for minute or two. I've
limit 50 connections for smtpd
> >> > (local 20 and remote 10), all 50
connections are used. Server load is
> >> > about 50 - 100 and mostly is not
responding. I setup connections limit
> >> > (timeoutconnect - 20, timeoutremote - 60,
timeoutsmtpd - 60) it helps
> >> > little (dropping spammers and peple who
only block free connections).
> >> > Computer is core duo 2 6400 2.13GHz
with 2G ram. Emails are on
> >> > separate disc. Discs are sata with sw
raid (mirror) using reiserfs
> >> > (need migrate to xfs). There is nothing
unusual in logs (except no
> >> > activity for minute or two) - no errors,
qmail is accepting
> >> > connections.
> >> >
> >> > After this "timeout"
spamassassin takes long time to process emails.
> >> >
> >> > Where can be problem ? Weak CPU, bad
power source, bad settings ?
> >> >
> >> > Qmail is compiled with conf-spawn = 509,
conf-split=101. Qmail-scanner
> >> > using st patch, using fast spamassassin.
Spamassassin is 3.2.1. OS
> >> > Debian testing
> >> >
> >> > Any advices welcome, thank you or help.
> >> >
> >> > Lampa
> >> >
> >> Try upping your concurrency for SMTP... with
your hardware, 100 SMTP
> >> connections should not be a problem.
> >> First: check your logs and determine your
highest local slot usage. With
> >> this in mind,
> >> 20 local connections maybe is too much, since
these are done really
> >> fast, try with 10 or even 5...
> >> 10 remote connections is way too little, these
can take a lot of time to
> >> complete depending on how much bandwidth you
have available. What is the
> >> size of your queue? If you have a lot of
messages in your queue raising
> >> from 10 to 20 (or even 40) connections will
help a lot!
>
> with qmail-scanner, this means that the given number of
remote connections may be
> in the scanning phase simultaneously. If you have
antivirus or spamassassin as part
> of your scanning, make sure that the memory footprint
of these processes does
> not exceed actual RAM
>
> Wolfgang
>
>
>
>
>
>
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-------------
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> Still grepping through log files to find problems? 
Stop.
> Now Search log events and configuration files using
AJAX and a browser.
> Download your FREE copy of Splunk now >> http://get.splunk.com/
> _______________________________________________
> Qmail-scanner-general mailing list
> Qmail-scanner-generallists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/q
mail-scanner-general
>

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Still grepping through log files to find problems?  Stop.
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Download your FREE copy of Splunk now >> http://get.splunk.com/
_______________________________________________
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mail-scanner-general