sos on cyrusimapd

[Eric W. Bates]

Yah. You need to crank up some buffer sizes.

This is an excellent document (written for FreeBSD 10):
https://calomel.org/freebsd_network_tuning.html

I think the one you're bumping your head on is:
kern.ipc.maxsockbuf

but you shouldn't crank it up by itself.

On 06/27/2018 10:09 AM, Albert Shih wrote:
> Hi everyone,
> 
> So today I switch all my user from my old server to the new one running
> cyrus-imapd 3.0.7 with FreeBSD 11.1-p11.
> 
> The server get 192Go of Ram.
> 
> Currently I got lot of disconnection from MUA (mutt), the client going to
> keep the connection during let's say few minutes and then I lost the
> connection (nothing to do with the network).
> 
> If I relaunch just after de disconnection, I can get
> 
>    back maibox pretty quickly,
>    back maibox very slowly
>    connection error (strange SSL I/O error on the client)
> 
> On the server I didn't see lot of message, only this strange
> 
>    onewconn: pcb 0xfffff8276c40e570: Listen queue overflow: 49 already in queue awaiting acceptance (209 occurrences)
> 
> knowing I'm not able to find the pcb fffff8276c40e570 with netstat or lsof,
> event it not change in time.
> 
> I guessing I mis configure something...but what ?
> 
> I know the server are under heavy load because all my user's client are
> re-synchronize their mailbox. But well It's not very good...
> 
> Is anybody running cyrusimapd on FreeBSD have tuning some special variable
> in the kernel through sysctl ?
> 
> Regards
> 
> --
> Albert SHIH
> Observatoire de Paris
> xmpp: jas at obspm.fr
> Heure local/Local time:
> Wed Jun 27 16:03:10 CEST 2018
> ----
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