Return-Path: Message-ID: <4E2C46CE.2060000@kernelconcepts.de> Date: Sun, 24 Jul 2011 18:22:38 +0200 From: Nils Faerber MIME-Version: 1.0 To: linux-bluetooth@vger.kernel.org Subject: RFCOMM connection lag (slow) Content-Type: text/plain; charset=ISO-8859-15 Sender: linux-bluetooth-owner@vger.kernel.org List-ID: Hi! I recently found a strange behaviour... I have a device which accepts an RFCOMM connection on channel 1. Creating the connection works just fine and I can basically communicate. But as soon as larger chunks of data are sent (something like 128 bytes at a time) it starts to take a pretty long time to transfer it (in the range of about a second). The connection stays connected and data can be sent but at a very slow pace. This is from a 2.6.39 kernel to the device, my PC has a Bluetooth3.0 USB device. The interesting part is that if I try the same thing from an HTC G1 phone it works as expected, i.e. "fast". I tried to compare the HCI settings between the HTC G1 and my notebook and did the same on my notebook which did not help (the only obvious difference was disabled PARK mode and a slightly different ACL MTU). It is pretty likely that the device also has an RFCOMM bug here but since it works with the HTC phone it must be possible to make it work with my notebook too. Any hint would be very much appreciated ;) Thanks! Cheers nils -- kernel concepts GbR Tel: +49-271-771091-12 Sieghuetter Hauptweg 48 D-57072 Siegen Mob: +49-176-21024535 http://www.kernelconcepts.de