Re: atkbd_timeout() period?

From: Mehmet Erol Sanliturk <m.e.sanliturk_at_gmail.com>
Date: Wed, 05 Jan 2022 07:07:17 UTC 
On Wed, Jan 5, 2022 at 9:39 AM Warner Losh <imp@bsdimp.com> wrote:

>
>
> On Tue, Jan 4, 2022 at 10:42 PM Alexander Motin <mav@freebsd.org> wrote:
>
>> Hi,
>>
>> As I see, one of the most active threaded callouts on idle VMware VM and
>> some hardware is atkbd_timeout(), called 10 times per second.  Plus it
>> is also one of few remaining non-MP-safe callouts.  According to the
>> comment it seems to be only a workaround for some lost interrupts.  That
>> makes me thing: is it really needed to run so often and so accurate, or
>> may be we could reduce it to 1-2 times per second?  Or may be it can be
>> avoided somehow 20 years later?
>>
>
> Yea, we can likely just trash it and wait for people to complain about the
> keyboard being hung. I doubt we'll get any complaints because Xaccel 2.1
> was quite a long time ago... It is no longer relevant and the original
> conditions
> that caused the lost interrupts are likely long gone...
>
> And if they aren't, we'll get a reproducible test case to judge what the
> right workaround
> should be.
>
> Warner
>



If  "10"  in   " atkbd_timeout(), called 10 times per second "
     can be defined by a control variable ,
then
     it may not be necessary to remove its call , and
     polling rate may be set with respect to the suitable needs .


Mehmet Erol Sanliturk