Messages in this thread |  | | Date | Fri, 10 Jan 2003 15:30:18 +0100 | From | Pavel Machek <> | Subject | Re: Honest does not pay here ... |
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Hi!
> > In very semplicistic words: > > In 2.5/2.6 kernels, non GPL modules have a big > > penalty, because they cannot create their own queue, but have to use a default > > one. > > I may be showing my ignorance here (won't be the first time) but this makes > me wonder if Linux could provide a way to do "user level drivers". I.e., > drivers which ran in kernel mode but in the context of a process and had > to talk to the real kernel via pipes or whatever. It's a fair amount of > plumbing but could have the advantage of being a more stable interface > for the drivers.
You don't need kernel mode to touch hw.
> If you think about it, drivers are more or less open/close/read/write/ioctl. > They need kernel privileges to do their thing but don't need (and shouldn't > have) access to all the guts of the kernel. > > Can any well traveled driver people see this working or is it nuts?
Well, nbd was originally created just for that.
Pavel
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