Installing reliance Broadband+ on fedora linux part two

September8

Was fairly satisfied with 60kbps speed on average with the Reliance Broadband+ connection using Zte AC2726 modem, when I stumbled upon an article saying the usbserial kernel module isnt designed for high speed access and has a bottleneck which caps the speed to over 60 kpbs on an average.

(You can check how to set it up here at the link below)

http://navindutta.com/wordpress/2009/09/installing-reliance-broadband-on-fedora-linux-part-one/

Hmm… Not quiet what we want when we pay for 3.1MBpS.. This should be dealt with; but how.

After hours of toil I figured out how to do this. Lets setup the kernel compiling environment. We update our kernel; install kernel source packages and kernel header files for compiling the hacked usbserial kernel module.

(My kernel version was 2.6.27.30-170.2.82.fc10.i686)

Lets do this.

#yum update kernel
#yum install kernel-devel
#yum install kernel-headers

After this I tried to build a custom kernel but it kept failing. This was taken care of after I installed the ncurses dependency package for kernel compiling.

#yum install ncurses-devel

Okay..after installing ncurses-devel package lets see if we can build the kernel.

#cd /usr/src/kernels/`uname -r`/ && make menuconfig

Yes we can GEE …YUHOO … it gives a pretty menu like interface .. so we are ready to build our patched usbserial.ko

Lets locate the source file

#locate usb-serial.c

Output
#########################
/usr/local/bin/ztemtApp/zteusbserial/2.6.27/usb-serial.c
#########################
End Output

Lets copy this file the kernel module compiler directory for usbserial

#cp /usr/local/bin/ztemtApp/zteusbserial/2.6.27/usb-serial.c /usr/src/kernels/`uname -r`/drivers/usb/serial/

Make a backup if something goes.

#cp /usr/src/kernels/`unname -r`/drivers/usb/serial/ /home/nick/Desktop/usbserial_emergency_backup

Copy the files from the running usbserial module to build directory
#cp /usr/local/bin/ztemtApp/zteusbserial/2.6.27/* /usr/src/kernels/`uname -r`/drivers/usb/serial/

Patch the current usbserial.c with added layer to accomodate highspeed access argumentss

The patch file should be like this
************************************
61a62
> static ushort maxRSize, maxWSize, maxISize;
841a843,844
>         if (buffer_size < maxRSize)
>         buffer_size = maxRSize;
865a869,870
>         if (buffer_size < maxWSize)
>         buffer_size = maxWSize;
891a897,898
>             if (buffer_size < maxISize)
>             buffer_size = maxISize;
1260a1268,1273
> module_param(maxRSize, ushort, 0);
> MODULE_PARM_DESC(maxRSize, “User specified USB input buffer size”);
> module_param(maxWSize, ushort, 0);
> MODULE_PARM_DESC(maxWSize, “User specified USB output buffer size”);
> module_param(maxISize, ushort, 0);
> MODULE_PARM_DESC(maxISize, “User specified USB interrupt buffer size”);
************************************