Performance with postfix
ms-list at alexb.ch
Thu Apr 2 16:13:49 IST 2009
On 4/2/2009 4:52 PM, JC Putter wrote:
> Hi i am busy testing what load my mailscanner box can handle.
> i am running an intel 2.4Ghz with 1GB RAM and a normal SATA HDD drive using Postfix as MTA all RBL's are in SA al running on Centos 5.2
> i am using smtp-source to test sending 2000 messages at once and i not getting the results i was hoping for it, after 24 min of running there are still 1300 messages in the queue.
> is the normal or bad, postfix is a fast mta, i also noticed that mailscanner scans messages in batches of 30, and it really takes a long time for the 30 messages to be placed back in the queue.
> procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
> r b swpd free buff cache si so bi bo in cs us sy id wa st
> 0 0 187204 43488 19036 65140 1 1 7 23 73 7 5 0 94 0 0
> again am i asking too much from the hardware or is there something i can do to increase performance? '
> i am using a caching dns server and added
> none /var/spool/MailScanner/incoming tmpfs defaults 0 0
> in fstab
If you have little RAM, using tmpfs for MS's work is contraproductive.
Your swap usage show that what you could gain using tmpfs you loose by
swapping - and swapping on a single disk plus all the queue I/O will hog
On a *busy* box, using tmps with 4GB or less will cause it to swap and
work against you.
Also try using smaller batches and possibly less threads to give the box
some extra air.
More RAM isn't a large investment and every penny worth.
my 2 cents
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