Re: [Courier-imap] Trouble with courier imap dropping connections when memory is cached

[Sam V. <mr...@co...>]

Adam Olsen writes:

> Hello,
> 
> I'm having a bit of trouble with courier dropping imap connections.
> There is no error message, even if I telnet to the host and issue
> commands directly, I usually get something like "No error message
> received from IMAP server".

There's no such error message in courier-imap.

> This does not happen when I first start the server, for at least a
> day.  I'd say about 20% of connections are dropped if the server has
> been running for more than a day.
> 
> It seems to me that it's when the memory starts getting full on the
> machine.  A free -m command returns these results:
> 
> total       used       free     shared    buffers     cached
> Mem:         10018       9917        100          0        154       9046
> -/+ buffers/cache:        716       9301
> Swap:         5715          0       5715
> 
> Everything appears to be used up in the disk cache.  Is this a common
> problem?  What can I do to fix it?

Yes. The Linux kernel always uses all available memory for disk caching. 
This is normal, the memory caching, that is. This is not the problem.

The fact that you do not show any swap space being used indicates that you 
are not running out of memory. If you did, you'd use up swap, first.