I've been running Dapper for a while and thought I would test my system with Hardy. I installed Hardy on a separate partition so I can boot either Dapper-magma or Hardy-rtai kernels.
One of the first things I've noticed is that there is a big delay (about 0.5 sec) in responding to joypad actions. The delay makes the joypad unusable (not safe) for jogging since it occurs both starting and stopping motion. I tested using both hal_joystick and hal_input. The joypad is a common USB device that I got on ebay and it has worked fine with Dapper-magma. After some experimenting, I came up with the folowing test that demonstrates the behavior and can be run with no emc invocation. 1) issue a command to witness output of joypad: $ cat /dev/input/js0|dd ibs=1 obs=1 count=20000|xxd -c 8 (this pipeline gives fast response and doesn't put non-printing chars to the terminal) 2) push buttons and the axis sticks and notice how fast it responds Results: system input result ------------- -------------- ---------------------- Dapper-magma /dev/input/js0 instantaneous Hardy-generic /dev/input/js0 instantaneous Hardy-rtai /dev/input/js0 delayed (about 0.5sec) Hardy-generic /dev/input/mouse1 instantaneous Hardy-rtai /dev/input/mouse1 instantaneous Several things seem to have changed with udev and /dev/input and it seems to me there is something in the Hardy-rtai configuration that delays updates to the js0 (joypad) device. It is not common to all /dev/input devices since tests with the mouse in Hardy-rtai are instantaneous plus I'm sure a user would notice delays in mouse response. The config files /boot/config-2.6.24-16-generic /boot/config-2.6.24-16-rtai seem identical with respect to instances of CONFIG_JOYSTICK_*, CONFIG_HID_*, and CONFIG_USB_HID* Any ideas? Is there something special about joydev.ko that makes it behave differently with this rtai configuration? dewey -- Dewey Garrett (925)447-9364 ------------------------------------------------------------------------- Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08 _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
