Hello, El jue, 15-09-2005 a las 08:13 -0700, Shakthi Kannan escribió:
> 3. I want to try to strip down the gnumach kernel and > drivers to a minimal. Or is the default one the > minimum? I'd appreciate developers' inputs and their > experience they had on what makes GNUMach slow and > what needs to be fixed or what cannot be fixed. I am > particularly interested only in hardware and device > drivers. > AFAIK, some of the things that slow down Mach/Hurd are: 1. The way in which memory objects are accessed by the translators (vm_map+memcpy) 2. The fact that Mach/Hurd can't transfer more than one page (4K) at time to/from external pagers. 3. IPC scheduling jemarch is working on the last (by implementing "migrating threads" on GNU Mach) and I'm working on the first two (but help is really appreciated :-) Also, there's something that would be _very_ usefull and is related to hardware/drivers: upgrading the glue code of GNU Mach to support drivers from linux-2.6 (2.4 will be also fine ;-) and the architecture dependant code (i386/*). > 4. Do we write drivers in user-space or should I try > to use the existing device driver interface for > writing drivers? > IMHO, user-space drivers could be a nice feature in a future (for non-critical low-traffic devices), but right now they can't provide nothing better than more slowness and less stability. Happy Hacking! -- Sergio Lopez [EMAIL PROTECTED] _______________________________________________ Bug-hurd mailing list Bug-hurd@gnu.org http://lists.gnu.org/mailman/listinfo/bug-hurd
