Re: [Bluez-users] MTU in l2test

Manjunath Prabhu
2005-01-03T11:28:10Z

On Mon, 03 Jan 2005 12:00:31 +0100, Marcel Holtmann <marcel@holtmann.org> wrote:
> Hi Manjunath,
>
> > > > I am varying the mtu and data size variables in the l2test program.
> > > > From the docs, I learnt that maximum L2CAP payload is 65535 bytes. I
> > > > am unable to set the data size above 45000 bytes inspite of setting my
> > > > MTU to 65535 (both on the sender and the receiver).
> > > > I get an error saying "Send failed. Resource temporarily unavailable".
> > > > Hope you can help me with this one.
> > >
> > > the MTU is different for incoming and outgoing side. With what kind of
> > > device and what commands lines are you testing these.
> >
> > I am using anycom-120 dongles and using the l2test utility. I am also
> > setting the incoming and outgoing mtu values (imtu and omtu variables)
> > to the same value, say 65000 bytes. My 'datasize' is about 45000
> > bytes. I get the error as mentioned above.
>
> what is the output of "hciconfig -a" of the Anycom dongle. Check when
> this error occurs. Do you see it only when calling the send()/write()
> function? Maybe there is a buffer problem. What do you see with hcidump?
> Is the MTU correctly negotiated?

hi marcel,

the "hciconfig -a" shows

hci0: Type: USB
BD Address: 00:0B:0D:30:5D:EA ACL MTU: 120:20 SCO MTU: 64:0
UP RUNNING PSCAN ISCAN
RX bytes:114526 acl:28 sco:0 events:15460 errors:0
TX bytes:4857089 acl:39552 sco:0 commands:1400 errors:0
Features: 0xff 0xff 0x05 0x00 0x00 0x00 0x00 0x00
Packet type: DH5
Link policy:
Link mode: SLAVE ACCEPT
Name: ''
Class: 0x000000
Service Classes: Unspecified
Device Class: Miscellaneous,
HCI Ver: 1.1 (0x1) HCI Rev: 0x0 LMP Ver: 1.1 (0x1) LMP Subver: 0x757
Manufacturer: Silicon Wave (11)

I get this error when i use the send() function to pump the data out.
May be there is a problem with the HCI buffer. Is there some way to
add a delay. The L2CAP connection is correctly established and the MTU
is also correctly negotiated to the set value (65000) as seen in the
hcidump on both sides.

regards,
manjunath

> Regards
>
> Marcel
>
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