[OpenAFS] Network becomes terribly slow when cache manager flushes updates over xDSL

Goulou fredericg_99@yahoo.fr
Tue, 7 Jul 2009 11:31:20 +0200 (CEST)

Nobody has any idea about this? Isn't AFS designed to be used over "normal"=
 internet links? Or am I the only one with this slowing-down problem?

I'll be really happy if anybody would help me...

Fr=C3=A9d=C3=A9ric Grelot.

----- "Goulou" <fredericg_99@yahoo.fr> a =C3=A9crit :

> Hi all,=20
> I'm trying to give my users an access to their home directory over the
> Internet, so they can connect to there account from their homes
> (place, not directory...).
> Unfortunately, my tests show that when a large update occurs to the
> disk (for example, the user download a file and puts it in any
> directory, or makes a copy from USB to home dir), the connection
> always becomes terribly slow (ping>1000ms), and any other request
> takes ages to return (thus, if the user uses firefox for example,
> since it makes quite a lot of disk access to the ".mozilla" directory,
> its interface freezes until the update if over and ping becomes normal
> again, i.e 60ms)
> I managed to optimize this by setting a chunksize of 8kb (smaller
> seems to fail, because my cache is between about 500Mo-2Go, and that
> makes too many files for the cachemanager I think), and by adding an
> "fs st -allfiles 20000" in afs.conf like this:
> afs_server_prefs() { fs storebehind -allfiles 20000 }
> It is slighly better with these settings : I still get ping >1000ms,
> but less often...
> Is there any ways to enhance this again, or should I set some QoS on
> the system to prevent afs daemon to send to many packets at the same
> time (a solution that I'd rather avoid, since I'll not have full
> control over the client's systems...)?
> Tanks a lot for your advices!
> Fr=C3=A9d=C3=A9ric.
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