Sorry for the delay but was overloaded with other things.

On Wed, May 20, 2009 at 4:43 PM, Sam Hartman <hartm...@debian.org> wrote:
> Can I get you to make sure you have krb5-user installed,

Yes, I have that package.

> kinit -c KEYRING:blah <principal_name_goes_here>
> and start firefox with the KRB5CCNAME environment variable set to KEYRING:blah
>
> (to confirm you're using the keyring cache, probably doing a kdestroy
> on your normal tickets would be good)

Ok I did exactly this:
kinit -c KEYRING:blah <myuser>
export KRB5CCNAME="KEYRING:blah"
klist #now I see "Ticket cache: KEYRING:blah"
firefox & #very slow as before
klist #I see tickets requested for the web sites I'm trying to open

> What I'm trying to do here is to see if the performance is dependent
> on what type of credential cache is used.  I'm suspecting that there
> is a locking problem in either MIT or Heimdal.  Either MIT holds a
> lock too long, doesn't have fine grain locking somewhere, or Heimdal
> has a race condition and is not holding a lock that it needs.  The
> keyring cache has a different locking path than the file based cache.
> So, it may perform differently.  If it is faster, then that tells us
> something.  If it is not, then we don't learn much.

I wonder though if filesystem in use can make any difference given you
are suspecting some cache and locking?

> I don't have a test environment in which to reproduce this, although I
> am talking to upstream about the issue.  I have not actually opened an
> upstream bug at this point; I've brought the issue up on the krbcore
> list.

I know it's very hard when you can't reproduce. I will understand if
you give up as after all it is not a critical issue to me (I'm fine
using heimdal).

Thanks for trying to help. If you have any other ideas, I'll be happy
to try. Actually I have one. I didn't try with any other kerberos
service so if you know some other I can try with both implementations,
that could possibly make a reproducer.

Regards



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