[Gumstix-users] Gumstix Bluetooth Performance Issue

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Hi friends,

I'm experiencing some issues related to bluetooth performance on my
gumstix basix 400xm-bt with the duck antenna. I am getting about 40ms
latency. I'm not sure if this is normal or not. I'm also getting hci
errors and h4 unknown packets when I try to do more than just ping
over bluetooth. I've appended as much of my results from testing as
possible. Is anyone else seeing similar issues? I would welcome any
suggestions or advice.

Thanks,
jaya

>From my laptop to gumstix: Laptop is using a D-Link DBT-120 bluetooth dongle.
# l2ping 00:80:37:2E:31:7D
Ping: 00:80:37:2E:31:7D from 00:15:E9:65:3B:C5 (data size 44) ...
44 bytes from 00:80:37:2E:31:7D id 0 time 44.34ms
44 bytes from 00:80:37:2E:31:7D id 1 time 24.79ms
<snip>
44 bytes from 00:80:37:2E:31:7D id 7 time 27.08ms
44 bytes from 00:80:37:2E:31:7D id 8 time 53.13ms
^C9 sent, 9 received, 0% loss

Then from gumstix to the laptop:
# l2ping 00:15:E9:65:3B:C5
Ping: 00:15:E9:65:3B:C5 from 00:80:37:2E:31:7D (data size 44) ...
44 bytes from 00:15:E9:65:3B:C5 id 0 time 40.87ms
44 bytes from 00:15:E9:65:3B:C5 id 1 time 41.58ms
<snip>
44 bytes from 00:15:E9:65:3B:C5 id 6 time 40.45ms
44 bytes from 00:15:E9:65:3B:C5 id 7 time 41.74ms
8 sent, 8 received, 0% loss

Normal ping. gumstix is 192.168.50.100.
laptop pinging gumstix
# ping 192.168.50.100
PING 192.168.50.100 (192.168.50.100) 56(84) bytes of data.
64 bytes from 192.168.50.100: icmp_seq=1 ttl=64 time=66.7 ms
<snip>
^C
--- 192.168.50.100 ping statistics ---
6 packets transmitted, 6 received, 0% packet loss, time 5020ms
rtt min/avg/max/mdev = 26.279/41.658/66.730/12.928 ms

gumstix pinging laptop
# ping 192.168.50.1
PING 192.168.50.1 (192.168.50.1): 56 data bytes
84 bytes from 192.168.50.1: icmp_seq=0 ttl=64 time=72.4 ms
<snip>
--- 192.168.50.1 ping statistics ---
6 packets transmitted, 6 packets received, 0% packet loss
round-trip min/avg/max = 44.0/54.0/72.4 ms

But at least there aren't any errors or packet loss. When I'm testing
normal apps that probably transfer more data, I get the following
error messages:
h4_check_data_len: Data length is too large
h4_recv: Unknown HCI packet type 00
h4_recv: Unknown HCI packet type df
h4_recv: Unknown HCI packet type 05
<snip>
h4_recv: Unknown HCI packet type 00
h4_check_data_len: Data length is too large
h4_recv: Unknown HCI packet type 00
<snip>
h4_recv: Unknown HCI packet type 00
h4_check_data_len: Data length is too large
h4_recv: Unknown HCI packet type 00
<snip>
h4_recv: Unknown HCI packet type 38
h4_recv: Unknown HCI packet type 00
hci_acldata_packet: hci0 ACL packet for unknown connection handle 8
hci_scodata_packet: hci0 SCO packet for unknown connection handle 13
hci_scodata_packet: hci0 SCO packet for unknown connection handle 11
hci_scodata_packet: hci0 SCO packet for unknown connection handle 11
hci_scodata_packet: hci0 SCO packet for unknown connection handle 0
hci_acldata_packet: hci0 ACL packet for unknown connection handle 512
h4_recv: Unknown HCI packet type 00
<snip>
hci_acldata_packet: hci0 ACL packet for unknown connection handle 8
hci_scodata_packet: hci0 SCO packet for unknown connection handle 6
hci_scodata_packet: hci0 SCO packet for unknown connection handle 0
hci_scodata_packet: hci0 SCO packet for unknown connection handle 10

and that just dies after a point.

ps: module details:
# hcitool info 00:80:37:2E:31:7D
Requesting information ...
        BD Address:  00:80:37:2E:31:7D
        Device Name: Gumstix (0)
        LMP Version: 2.0 (0x3) LMP Subversion: 0x62b9
        Manufacturer: Infineon Technologies AG (9)
        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>
# hcitool lq 00:80:37:2E:31:7D
Link quality: 230
# hcitool tpl 00:80:37:2E:31:7D
Current transmit power level: 3

looking at laptop data:
# hcitool info 00:15:E9:65:3B:C5
Requesting information ...
        BD Address:  00:15:E9:65:3B:C5
        Device Name: lappy1-0
        LMP Version: 1.1 (0x1) LMP Subversion: 0x20d
        Manufacturer: Cambridge Silicon Radio (10)
        Features: 0xff 0xff 0x0f 0x00 0x00 0x00 0x00 0x00
                <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>
# hcitool lq 00:15:E9:65:3B:C5
Link quality: 151
# hcitool tpl 00:15:E9:65:3B:C5
Current transmit power level: 4