[Bluez-devel] Socket concurrency / first tests

["Olivier Le Pogam" <olepogam@free.fr>]

Hello,

I have been working on socket concurrency tests in the last days, i.e. 
opening RFCOMM sockets to a maximum number of remote devices (mobile phones 
in this case). I have used a usual "connect" with blocking sockets - 
socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM). Each connection is 
performed to a different mobile phone, I have a row of phones on my desk :)

I'm using a 2.6.22.12 kernel with BlueZ 3.20 libs/utils, and from 1 to 4 
bluetooth dongles (Bt 2.0 EDR USB 2.0, an USB 2.0 hub connected to an USB 
2.0 port). "passkey-agent --default 0000 &" running.

1) With one bluetooth dongle only : I can successfully open up to 7 
concurrent connections to 7 mobile phones, then a sleep(60), then close the 
socket. I simply create one process for each connect() to each device and 
launch them all as fast as possible. It's working fine except :
- when one mobile host is down (I have intentionally switched one off) then 
all next "connect" are delayed, and usually lead to a "connection timeout" 
or "operation now in progress" when leaving the "connect".
- when a pairing is required it is about the same, all the rest seems 
delayed.

2) With more dongles, trying to perform (still at the same time) a connect() 
to one phone on hci0, another on hci1 etc ... up to hci3 (i.e. only 4 
connects to 4 devices), I always get connections errors, and the first 
connection try seems to get a lot of time.

I will certainly come back tomorrow with some hcidumps, but basically I have 
the feeling that some operations are blocking, and I also wonder about the 
blocking connect() timeout, which sometimes makes connect() exit with a 
E_INPROGRESS or a connection timeout -in my opinion- a bit too quickly.

If someone could help me in my investigations it would be really great !!

Best regards,
Oli 


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