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Old 01-21-2008, 09:00 PM   #1
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Registered: Sep 2007
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slow data transfer speeds with bluez

Hi There,

Am running debian with the latest 2.6.23 kernel and bluez 3.24 and seem to be getting incredibly slow data transfer speeds (takes me about 45/50 secs to send a 900KB file) which I know is well below what the device is capable of.

This issue is replicated on my slackware system which is also running bluez. I'm guessing there is a setting I am unaware of that needs to be changed so that this device works to full capacity but have no idea where to look.

The device is a USB bluetooth 2.0 dongle with edr and a class 1 radio (100m) and is based on the CSR chipset.

The various hciconfig outputs are as follows;

voyage:~# hciconfig -a
hci0: Type: USB
BD Address: XX:XX:XX:XX:XX:XX ACL MTU: 310:10 SCO MTU: 64:8
RX bytes:707 acl:0 sco:0 events:25 errors:0
TX bytes:350 acl:0 sco:0 commands:24 errors:0
Features: 0xff 0xff 0x8f 0xfe 0x9b 0xf9 0x00 0x80
Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
Link policy:
Name: 'MyDongle-0'
Class: 0x000100
Service Classes: Unspecified
Device Class: Computer, Uncategorized
HCI Ver: 2.0 (0x3) HCI Rev: 0xbf4 LMP Ver: 2.0 (0x3) LMP Subver: 0xbf4
Manufacturer: Cambridge Silicon Radio (10)

voyage:~# hciconfig hci0 features
hci0: Type: USB
BD Address: XX:XX:XX:XX:XX:XX ACL MTU: 310:10 SCO MTU: 64:8
Features: 0xff 0xff 0x8f 0xfe 0x9b 0xf9 0x00 0x80
<3-slot packets> <5-slot packets> <encryption> <slot offset>
<timing accuracy> <role switch> <hold mode> <sniff mode>
<park state> <RSSI> <channel quality> <SCO link> <HV2 packets>
<HV3 packets> <u-law log> <A-law log> <CVSD> <paging scheme>
<power control> <transparent SCO> <broadcast encrypt>
<EDR ACL 2 Mbps> <EDR ACL 3 Mbps> <enhanced iscan>
<interlaced iscan> <interlaced pscan> <inquiry with RSSI>
<extended SCO> <EV4 packets> <EV5 packets> <AFH cap. slave>
<AFH class. slave> <3-slot EDR ACL> <5-slot EDR ACL>
<AFH cap. master> <AFH class. master> <EDR eSCO 2 Mbps>
<EDR eSCO 3 Mbps> <3-slot EDR eSCO> <extended features>

voyage:~# hciconfig hci0 revision
hci0: Type: USB
BD Address: XX:XX:XX:XX:XX:XX ACL MTU: 310:10 SCO MTU: 64:8
Unified 21d
Chip version: BlueCore4-External
Max key size: 128 bit
SCO mapping: HCI

Cheers guys, any help would be much appreciated as I've been banging my head on this one for a while

Old 01-23-2008, 08:46 AM   #2
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Location: N. E. England
Distribution: Fedora, CentOS, Debian
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Please post your thread in only one forum. Posting a single thread in the most relevant forum will make it easier for members to help you and will keep the discussion in one place. This thread is being closed because it is a duplicate.

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