Re: GGI Project Unhappy On Linux

H. Peter Anvin (hpa@transmeta.com)
29 Mar 1998 01:54:55 GMT

Followup to: <Pine.LNX.3.95.980329022921.12876D-100000@ferret.lmh.ox.ac.uk>
By author: Chris Evans <chris@ferret.lmh.ox.ac.uk>
In newsgroup: linux.dev.kernel
>
> Initially if we just aimed for mode switching in the kernel, maybe. Mode
> switching is very infrequent, and certainly not time critical. No-one is
> going to notice the extra overhead of an ioctl().
>
> But yes if accel requests get handled by the kernel we need to coalesce
> requests in userspace and transfer multiple commands to kernel space per
> syscall.
>

Don't forget, though, the high cost of kernel memory (although
kmod/kerneld helps with that aspect if performance isn't an issue.)

-hpa

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