From: Marcel Holtmann <marcel@holtmann.org>
To: BlueZ users <bluez-users@lists.sourceforge.net>
Subject: Re: [Bluez-users] [Bluez Users] Page timeout during sdp on heavy traffic.
Date: Tue, 29 May 2007 22:20:54 +0200 [thread overview]
Message-ID: <1180470054.21432.141.camel@aeonflux.holtmann.net> (raw)
In-Reply-To: <80236d750705290911g619e3d9eu8c6cda81c884b44d@mail.gmail.com>
Hi Emanuele,
> I wrote a little application to simulate an heavy traffic.
> Simply discovers devices using hci0 and for each device discovered
> starts a thread to search service using hci1.
> Rinse and repeat forever.
> Usually I have 5-6 bluetooth devices in the area.
> I'm not using d-bus messaging (yet) but i guess i'll try that too to
> check
>
> Anyway I noticed a large number of timeouts during search services on
> devices who previously returned correct service record.
I have no idea how often I have to say that, but you can't page devices
at the same time. The chips simply don't support that. The same reason
why you can run an inquiry and page at the same time. It is not
possible. Period. And this means you have to serialize the SDP service
requests.
New kernel versions try to handling pending page attempts for piconet
creation, but that is also limited. And simultaneous name resolve
request can also cause troubles.
Regards
Marcel
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next prev parent reply other threads:[~2007-05-29 20:20 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-29 16:11 [Bluez-users] [Bluez Users] Page timeout during sdp on heavy traffic Emanuele Novelli
2007-05-29 20:20 ` Marcel Holtmann [this message]
2007-05-30 7:36 ` Emanuele Novelli
2007-05-30 7:58 ` Marcel Holtmann
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