Performance issues - how to start debugging

[David Cowan]

Improper DNS settings can do this.  Kolab waits for DNS replies to its 
query's to confirm  where / who you are, then continues.
This is especially true for non-snakeoil certs.
The variable timeout that you experience could be the time-to-live in 
DNS, and / or the DNS daemon chasing around trying to figure out who you 
are.

Wireshark is great, IPTraf is easier.  They will tell you what is going 
on, or not going on :)

Goodluck !






On 15-06-25 08:05 AM, Geert Janssens wrote:
> Hi,
>
> My kolab setup has been running for a week now with 11 users.
>
> In this period we experienced several delays in performing an action.
>
> For example:
> - adding a new appointment via the roundcube webinterface can take up to
> 2 minutes between clicking in some calendar and the appointment entry
> interface popping up. Other times it works immediately. Similar delays
> have been seen in other actions throughout the roundcube interface.
>
> - sending a mail from Outlook sometimes hangs for more than a minute
> seemingly doing nothing.
>
> - to eliminate any Outlook oddities I also installed Thunderbird, and it
> shows the same unpredictable behavior.
>
> The delays seem to be random. It can work fine for a while and then out
> of the blue it happens again.
>
> Any tips on where to start debugging this ? There are so many components
> I don't know the most likely candidates. I checked the mail logs for
> oddities, but can't find anything. While the delays are in progress,
> there is simply nothing written to the logs.
>
> Can I configure the different kolab components to log timing information
> of some kind ? Ohter suggestions what could cause this ?
>
> Thanks in advance,
>
> Geert Janssens
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