dovecot 2 low TCP speed (fetching big mail)

[Edgar Pettijohn]

I was just messing around with my pf.conf and then I read this, so just 
a thought do you have any kind of firewall that may be slowing the process??

On 01/01/15 06:29, Wojciech Puchar wrote:
> i use dovecot 2 under FreeBSD (dovecot2-2.2.15 compiled from ports).
>
> tried both with kqueue enabled or not.
>
> everything works very fast, EXCEPT fetching big mail.
>
> tried multiple clients (thunderbird on windows, alpine on the same 
> server, alpine on other unix server connected by 1Gb/s LAN)  and 
> fetching peaks at 1MB/s. NO SSL!
>
> could you please point me where to search for a problem.
>
> hints:
>
> writing over IMAP (eg. writing to Sent folder) works at full speed.
>
> Doesn't seem like a problem with unix server, every other service goes 
> at speed 70-100MB/s both directions (like samba, ftp).
>
> tried to turn off "kqueue" compile time option, no difference.
>
> Please give me a hint at least what to check. Does dovecot use other 
> way to sent data over TCP socket than other programs?
>
> thank you.