Re: [Evolution] Huge delays when creating appointments

["John A. Sullivan III" <jsullivan opensourcedevel com>]

On Mon, 2010-05-10 at 10:09 +0200, Milan Crha wrote:
> On Fri, 2010-05-07 at 18:18 -0400, John A. Sullivan III wrote:
> > Hello, all.  We almost have Evolution working with Zimbra after patching
> > the webdav Contact code.  The last big problem we have is an enormous
> > (almost a minute) delay when creating appointments.
>
>       Hi,
> my last tests with Zzzimbra server is the same, evolution-data-server
> (or in newer (2.30+) versions e-calendar-factory/e-addressbook-factory)
> is waiting for a response from the server. It takes then so long on
> writing for some reason only they (Zzzimbra developers) probably know.
>
> With respect of icons, try install/update gnome-icon-theme. What is your
> exact version of evolution/evolution-data-server?
>       Bye,
>       Milan
I think I'm getting close to understanding why we have the delay but
need to do a little more testing this morning.  We see Evolution do the
DAV PUT and there is an immediate create response from Zimbra.  However,
Zimbra then waits 75 seconds before issuing a FIN to close the TCP
session.  Only then does Evolution do a DAV GET (I assume to confirm
creation).

In the meantime, we see the Evolution client trying to issue a FIN to
the Zimbra server but it is for a seemingly different connection
(different ACK and SEQ numbers).  In fact, we see Evolution issue this
FIN,ACK before it starts creating the appointment.  I do not know if it
is related.  In the meantime, we see the Zimbra server trying to issue
RST for these ACKs as it has no associated TCP connection (I assume).
Since we have a firewall between the users and the Zimbra server, these
resets are being dropped as they are not associated with any existing
TCP connection.  I'm going to allow that traffic in a few minutes and
see if it eliminates the delay.  I don't know where these stray FIN
packets are coming from but they seem consistent.

Regarding Evolution versions, here's what I have:

evolution     2.28.3-1+b1
evolution-common   2.28.3-1
evolution-data-server    2.28.3.1-1.3
evolution-data-server-common     2.28.3.1-1.3

I have gnome-icon-theme 2.30.1-1.

Thanks - John