On Monday 31 October 2005 07:47, Vojtech Pavlik wrote:
> On Mon, Oct 31, 2005 at 02:24:02AM -0500, Dmitry Torokhov wrote:
> > Input: atkbd - speed up setting leds/repeat state
> >
> > Changing led state is pretty slow operation; when there are multiple
> > requests coming at a high rate they may interfere with normal typing.
> > Try optimize (skip) changing hardware state when multiple requests
> > are coming back-to-back.
> >
> > Signed-off-by: Dmitry Torokhov <[email protected]>
>
> It looks good - just two comments:
>
> 1) wmb() shouldn't be needed after set_bit()
>
Judging by the comments in bitops only i386 implementation of set_bit
implies memory barrier, other arches do not guarantee it. That's why
I added wmb() there.
> 2) maybe we want to enforce the delay before we send the
> next SET_LED command.
>
Well, with this patch "while true; do xset led 3; xset led -3; done"
does not interfere with typing on my box and system load is staying
low which means we don't have too many outstanding requests.
--
Dmitry
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