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You are correct. Postfix (and MTAs in general) are extremely disk IO intensive. If you're looking into improving performance of the system, I recomend you look into a faster disk subsystem. A lot of work can be done tweaking Postfix for optimal performance too (running a second instance for defered emails, tuning the # of processes and SMTP timeouts, moving spools onto their own disks (or at least separate partitions), if you're willing to risk loosing data in the event of a power outage you can also try using a ramdisk for spool, etc...)

You may be able to squeeze a little more performance out of your existing system by generating (and delivery to postfix) mails in parallel. I was running on a e450 for a while with 4 CPUs and postfix and I found that my optimal generation rate was produced by having 8 simultaneoue mail generation/injection processes. Your performance may vary, but its worth looking into. If you try this, be careful not to flood postfix's mailqueues. If they grow too large performance will suffer.


In reply to Re: Re: Re: Net::SMTP slow on linux by lhoward
in thread Net::SMTP slow on linux by shadowpuppet

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