On Fri, 18 Mar 2005 10:29:02 +0100 (CET)
[EMAIL PROTECTED] wrote:
> You can't do that. It could means : software filtering that is slow,
> and/or kernel system call that is also slow.
>
> Why do you need that ? If you provided hardware access to a safe interface
> of the card, there is no problem. (this interface context should be saved
> and restored by the kernel when a task switch occur, the card could also
> manage "few" context (3/4, the opengl programme and the windows manager at
> least))
You don't want to access the graphics card on every task switch.
On a current linux system you have something between 100 and 2000
context switches per second. If you do something like this, then
the driver has to intercept every access and check whether
the registers need to be swapped.
Attila Kinali
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