[imp] Re: IMP authentication and email access very slow

[Gavin Kelman]

Jan Schneider wrote:
> Zitat von Gavin Kelman <gavin.kelman at uk.lionbioscience.com>:
>>Is there a way to enable debugging in IMP so that I can see
>>_exactly_ what's going on with IMP <-> IMAP server communication?
> 
> No, because not IMP is doing the communication, but the c-client 
> library compiled into PHP.

Fair enough.

>>With the Horde authentication set to use IMP as the authentication
>>method, logins take about 15-30 seconds. With Horde set to use the
>>IMAP server directly, logins take about 0.5 seconds. If I then go
>>to IMP and login again, it take 15-30 seconds to login.
> 
> This is not *that* unusual, because there are a lot of tasks done by 
> IMP on login.

It used to be a heck of a lot faster. I'd be unimpressed if it's usually
this slow on a dual 2.4ghz machine with 2GB RAM for one user.

>>With either authentication method set, _most_ of the time, once
>>logged in, selecting other folders and viewing messages is very
>>fast now (I've also enabled folder caching), but 5% or so of the
>>time, selecting a different mail folder takes a good 5-30 seconds
>>to change.
> 
> This sounds like temporary timeouts, e.g. during DNS lookups of PGP key 
> server timeouts.

The PGP timeout is set to 1. Local nameservers are all working fine, and
I'd expect some DNS caching to speed things up after logging in the
first time.

I've started to do some tests against our IMAP server. Telnetting to it
on port 143 and doing '. login username password' is fine, but then
'. list "" *' takes anything upto 30 seconds. Thus, leading me to
believe it's our Cyrus IMAP server at fault. Squirrelmail somehow brings
up the folder list in no time at all.

Getting a bit off topic now, but does anyone know why Cyrus would take
_SUCH_ a long to return a folder list with the '. list "" *' command?


Cheers,
Gavin.

-- 
Gavin Kelman
UNIX Administrator
LION Bioscience Ltd.