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    SubjectRe: Billionton bluetooth CF card: performance is 10KB/sec
    Date
    On Saturday 22 October 2005 13:31, Pavel Machek wrote:
    > Hi!
    >
    > Ping time is around 50msec, and that seems pretty much okay, but
    > 10KB/sec seems like way too low.
    >
    > I am limited to 10KB/sec both on linux-to-linux bnetp transfers and it
    > limits my transfer rates using edge and n6230, too :-(.
    >
    > Ping times during transfer:
    >
    > 64 bytes from 10.1.0.3: icmp_seq=149 ttl=64 time=62.8 ms
    > 64 bytes from 10.1.0.3: icmp_seq=150 ttl=64 time=64.2 ms
    > 64 bytes from 10.1.0.3: icmp_seq=151 ttl=64 time=85.9 ms
    > 64 bytes from 10.1.0.3: icmp_seq=152 ttl=64 time=80.3 ms
    > 64 bytes from 10.1.0.3: icmp_seq=153 ttl=64 time=132.1 ms
    > 64 bytes from 10.1.0.3: icmp_seq=154 ttl=64 time=64.8 ms
    > 64 bytes from 10.1.0.3: icmp_seq=155 ttl=64 time=128.3 ms
    > 64 bytes from 10.1.0.3: icmp_seq=156 ttl=64 time=116.3 ms
    > 64 bytes from 10.1.0.3: icmp_seq=157 ttl=64 time=120.5 ms
    > 64 bytes from 10.1.0.3: icmp_seq=158 ttl=64 time=240.2 ms
    > 64 bytes from 10.1.0.3: icmp_seq=159 ttl=64 time=111.2 ms
    > 64 bytes from 10.1.0.3: icmp_seq=160 ttl=64 time=382.1 ms
    > 64 bytes from 10.1.0.3: icmp_seq=161 ttl=64 time=912.6 ms
    > 64 bytes from 10.1.0.3: icmp_seq=162 ttl=64 time=1612.1 ms
    > 64 bytes from 10.1.0.3: icmp_seq=163 ttl=64 time=4373.6 ms
    > 64 bytes from 10.1.0.3: icmp_seq=164 ttl=64 time=5128.8 ms
    > 64 bytes from 10.1.0.3: icmp_seq=165 ttl=64 time=7191.1 ms
    > 64 bytes from 10.1.0.3: icmp_seq=166 ttl=64 time=9473.1 ms
    > 64 bytes from 10.1.0.3: icmp_seq=167 ttl=64 time=8469.0 ms
    > 64 bytes from 10.1.0.3: icmp_seq=168 ttl=64 time=10040.7 ms
    > 64 bytes from 10.1.0.3: icmp_seq=169 ttl=64 time=9036.7 ms
    > 64 bytes from 10.1.0.3: icmp_seq=170 ttl=64 time=10681.1 ms
    > 64 bytes from 10.1.0.3: icmp_seq=171 ttl=64 time=9677.1 ms
    > 64 bytes from 10.1.0.3: icmp_seq=172 ttl=64 time=8673.0 ms
    > 64 bytes from 10.1.0.3: icmp_seq=173 ttl=64 time=10685.0 ms
    > 64 bytes from 10.1.0.3: icmp_seq=174 ttl=64 time=9681.0 ms
    > 64 bytes from 10.1.0.3: icmp_seq=175 ttl=64 time=8677.0 ms
    > 64 bytes from 10.1.0.3: icmp_seq=176 ttl=64 time=11997.2 ms
    > 64 bytes from 10.1.0.3: icmp_seq=177 ttl=64 time=10993.4 ms
    > 64 bytes from 10.1.0.3: icmp_seq=178 ttl=64 time=9989.3 ms
    > 64 bytes from 10.1.0.3: icmp_seq=179 ttl=64 time=13797.3 ms
    > 64 bytes from 10.1.0.3: icmp_seq=180 ttl=64 time=12793.3 ms
    > 64 bytes from 10.1.0.3: icmp_seq=181 ttl=64 time=11789.1 ms
    > 64 bytes from 10.1.0.3: icmp_seq=182 ttl=64 time=10784.9 ms
    > 64 bytes from 10.1.0.3: icmp_seq=183 ttl=64 time=9781.1 ms
    >
    > Netdev watchdog complains a lot:
    >
    > Oct 22 18:53:57 amd pand[2439]: Bluetooth PAN daemon version 2.19
    > Oct 22 18:53:57 amd pand[2439]: Connecting to <won't tell you>
    > Oct 22 18:53:58 amd pand[2439]: bnep0 connected
    > Oct 22 18:54:37 amd kernel: usb 3-1: USB disconnect, address 2
    > Oct 22 18:55:33 amd kernel: NETDEV WATCHDOG: bnep0: transmit timed out
    > Oct 22 18:55:59 amd last message repeated 2 times
    > Oct 22 18:56:51 amd last message repeated 5 times
    > Oct 22 18:57:55 amd last message repeated 3 times
    > Oct 22 18:59:03 amd last message repeated 7 times
    >
    > I use this to set up billionton:
    >
    > setserial /dev/ttyBT baud_base 921600
    > hciattach -s 921600 /dev/ttyBT bcsp
    >
    > root@amd:~# tcpspray -n 1 -b 1000000 10.1.0.3
    >
    > Transmitted 1000000 bytes in 163.256781 seconds (5.982 kbytes/s)
    >
    > (okay, this was little slower, I was far from other side). Most tests
    > look like this:
    >
    > root@amd:~# tcpspray -n 1 -b 1000000 10.1.0.3
    >
    > Transmitted 1000000 bytes in 103.183640 seconds (9.464 kbytes/s)

    Pavel,

    I see about the same with a bluetooth usb adapter. Suspect that is about what
    you should see with bluetooth - its not designed for speed. It would be really
    nice to be wrong though...

    Ed Tomlinson
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