[Bluez-users] Low bit rate

[Bluez-users] Low bit rate

[Ramin Rezaiifar]

I use the bluetooth link between a Palm T3 and a Linux machine.
The data rate seems to be noticeably lower than the rate when I use the 
Palm device with a Windows XP machine.  In both cases I use a Linksys 
USB dongle.

The following is the hciconfig output.  Has anyone else experienced such 
a difference between windows and Linux?
Can I increase the rate with the hcitool by changing the pcacket type 
for the connection?

thanks,

-Ramin


[root@popak root]# hciconfig -a
hci0:   Type: USB
       BD Address: 00:0C:41:E1:E9:E1 ACL MTU: 192:8  SCO MTU: 64:8
       UP RUNNING PSCAN ISCAN AUTH
       RX bytes:1554350 acl:33441 sco:0 events:55264 errors:0
       TX bytes:9553470 acl:66586 sco:0 commands:160 errors:0
       Features: 0xff 0xff 0x0f 0x00
       Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
       Link policy: HOLD SNIFF PARK
       Link mode: SLAVE ACCEPT
       Name: 'popak.myftp.org-0'
       Class: 0x120104
       Service Classes: Networking, Object Transfer
       Device Class: Computer, Desktop workstation
       HCI Ver: 1.1 (0x1) HCI Rev: 0x20d LMP Ver: 1.1 (0x1) LMP Subver: 
0x20d
       Manufacturer: Cambridge Silicon Radio (10)




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Re: [Bluez-users] Low bit rate

[Marcel Holtmann]

Hi Ramin,

> I use the bluetooth link between a Palm T3 and a Linux machine.
> The data rate seems to be noticeably lower than the rate when I use the 
> Palm device with a Windows XP machine.  In both cases I use a Linksys 
> USB dongle.

actually I don't use Windows, so I can't tell. In general the BlueZ is
as fast as possible. Maybe it is a RFCOMM flow control problem. Make
sure that you use the latest Linux kernel.

> Can I increase the rate with the hcitool by changing the pcacket type 
> for the connection?

No. Changing the packet types makes it only worse. Let the link manager
be able to use every packet type and let it choose the best for your
current connection.

Regards

Marcel




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Re: [Bluez-users] Low bit rate

[Ramin Rezaiifar]

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Re: [Bluez-users] Low bit rate

[Marcel Holtmann]

Hi Rmain,

> > actually I don't use Windows, so I can't tell. In general the BlueZ is
> > as fast as possible. Maybe it is a RFCOMM flow control problem.
> Can the flow control in RFCOMM be disabled? If yes, how can that be
> done?

no, because otherwise you won't get a stream.

Regards

Marcel




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