Hi. Our current implementation of -b auto on the USB bus does work, but it is pretty inefficient. This gets extremely obvious if one tries to run brltty in auto-detection mode on a small embeeded-type device, like ARM based machines running Linux. While BRLTTY is idling and trying to find a braille display, it consumes a lot of CPU time.
Even on not so small systems you can notice the performance hit. On a 2.8GHz machine of mine, brltty consumes 4% cpu every few seconds when watched with top. This is because we are iterating the whole USB for every single driver that supports USB devices. Can we think of a way to collect relevant USB IDs in autodetection mode beforehand, and do the iterating just once? Alternatively, can we perhaps cache USB device tree information during a cycle of driver open attempts? -- CYa, Mario | Debian Developer <URL:http://debian.org/> .''`. | Get my public key via finger [EMAIL PROTECTED] : :' : | 1024D/7FC1A0854909BCCDBE6C102DDFFC022A6B113E44 `. `' `- <URL:http://delysid.org/> <URL:http://www.staff.tugraz.at/mlang/> _______________________________________________ This message was sent via the BRLTTY mailing list. To post a message, send an e-mail to: BRLTTY@mielke.cc For general information, go to: http://mielke.cc/mailman/listinfo/brltty
