Re: [Bluez-devel] the effect of linux 2.6.18 to the bluez

Mingfan.Lu
2006-10-19T08:07:36Z

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Hi, Martin,

Thank you for you nice help.

I retest it in a ubuntu machine (kernel version 2.6.15), bluez lib's
version is 2.24
Then I rebuilt 2.6.18 in the ubuntu machine.
I still found that 2.6.18 is much slower than 2.6.15 when pushing obex over
bluez.

when I rebuit 2.6.18 in the 2.6.15 kernel machine:

make mrproper
make oldconfig (use default value for every new config)
make
make modules_install
make install
mkinitramfs -o /boot/initrd.img-2.6.18 2.6.18

I don't know whether the config make it happen or there is something wrong
with it?
So, Martin, How about you make config when you building your new kernel?

Thanks very much.

==============================================
2006/10/16, Martin Röhricht <ml@felicis.org>:
>
> Am Montag, den 16.10.2006, 13:25 +0800 schrieb Mingfan.Lu:
> > the following is my test result in a real machine:
> > [...]
>
> Okay, due to your tenacious demand, I compiled and installed a plain
> 2.6.18.1 vanilla kernel as well as a 2.6.18.1 kernel with the latest
> -mh5 patch applied.
> I will show you my test results for two files, the first being 1376034
> bytes (1,31MB) in size and the second being 2397995 bytes (2,29MB) in
> size.
> Let me at first mention the results that I got. I didn't encounter any
> slowness by using a 2.6.18.1 vanilla kernel. However it looks like the
> newly introduced and applied flow control may slow down the transfer
> speed. But be aware that (L2CAP) flow control mode is in action only by
> using two Linux kernels that have one of the latest -mh* patches
> applied! This mode is not(!) used by transmission between a Linux
> computer and another one that uses a proprietary Bluetooth software
> stack (even if the new Symbian OS may be able to use flow control mode,
> too), or say two Linux computers of which one has a kernel without this
> new patch applied.
> You didn't specify your exact settings -> did you apply one of the
> latest -mh* patches to you 2.6.18 kernel or not? Which computers did you
> use (one is the Linux computer but who is the other one)?
>
> So here are my results. The first three tests were done between a Linux
> computer and an Apple iMac G4 with the Apple Bluetooth stack that comes
> with Mac OS X 10.4:
>
> Test with kernel 2.6.18.1 and Apple Bluetooth Stack:
> Retrieval:
> 1376034 bytes -> 58 sec -> 23KB/s
> 2397995 bytes -> 95 sec -> 25KB/s
>
> Transmission:
> 1376034 bytes -> 42 sec -> 32KB/s
> 2397995 bytes -> 73 sec -> 32KB/s
>
>
> Test with kernel 2.6.15 (Ubuntu Dapper Drake) and Apple Bluetooth Stack:
> Retrieval:
> 1376034 bytes -> 57 sec -> 24KB/s
> 2397995 bytes -> 99 sec -> 24KB/s
>
> Transmission:
> 1376034 bytes -> 46 sec -> 29KB/s
> 2397995 bytes -> 77 sec -> 30KB/s
>
>
> Test with kernel 2.6.18.1-mh5 and Apple Bluetooth Stack:
> Retrieval:
> 1376034 bytes -> 54 sec -> 25KB/s
> 2397995 bytes -> 94 sec -> 25KB/s
>
> Transmission:
> 1376034 bytes -> 43 sec -> 31KB/s
> 2397995 bytes -> 73 sec -> 32KB/s
>
>
> ------------(now between two Linux computers)---------
> Test with kernel 2.6.18.1-mh5 to kernel 2.6.18.1-mh5
> Retrieval:
> 1376034 bytes -> 88 sec -> 15KB/s
> 2397995 bytes -> 154 sec -> 15KB/s
>
> Transmission:
> 1376034 bytes -> 82 sec -> 16KB/s
> 2397995 bytes -> 140 sec -> 17KB/s
>
>
> Test with kernel 2.6.18.1-mh5 to kernel 2.6.15 (Ubuntu Dapper Drake)
> Retrieval:
> 1376034 bytes -> 57 sec -> 24KB/s
> 2397995 bytes -> 99 sec -> 24KB/s
>
> Transmission:
> 1376034 bytes -> 68 sec -> 20KB/s
> 2397995 bytes -> 114 sec -> 21KB/s
>
>
> As you can see -- the transmission speed is quite constant between the
> same setups. Two things would need more investigations:
> (1) Why is it that a file transfer from Linux to Apple is faster than
> between two Linux entities?
> (2) Is it really L2CAP Flow Control Mode that slows down the connection
> with its protocol overhead?
>
> If Flow Control Mode really slows down the connection, we should try to
> implement a user interface to enable or disable this mode. But currently
> this is not urgent as no other device makes use of it.
>
> Martin
>
>
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--
With respects,
Mingfan.Lu

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