Hello Oleksij,
On Thu, 10 Jan 2019 11:12:32 +0100
Oleksij Rempel wrote:
> sched_priority = 1 is enough to dramatically reduce latency
> on have system load produced by tasks with default user space prio.
>
> Signed-off-by: Oleksij Rempel
Tested-by: Alexander Sverdlin
> ---
> drivers/tty/tt
On Mon, Jan 28, 2019 at 12:03 PM Linus Torvalds
wrote:
>
> That's harder to do for reads - because incoming characters happen in
> interrupt context, but shouldn't be all that hard to do for writes.
Side note: the reason I mention this part is that "harder" may not
mean "impossible".
In particul
On Mon, Jan 28, 2019 at 1:22 AM Oleksij Rempel wrote:
>
> Yes, I tested it with different linux-rt version with mostly similar results:
Hmm. It strikes me that you use very carefully timed serial *writes*
to control the laser cutter, but the flip buffer handling is mostly a
latency issue on the *
On 28.01.19 09:23, Greg Kroah-Hartman wrote:
On Mon, Jan 28, 2019 at 09:05:30AM +0100, Oleksij Rempel wrote:
On 10.01.19 17:30, Greg Kroah-Hartman wrote:
On Thu, Jan 10, 2019 at 04:19:53PM +0100, Oleksij Rempel wrote:
My gut feel is that if somebody still cares deeply about serial line
la
On Mon, Jan 28, 2019 at 09:05:30AM +0100, Oleksij Rempel wrote:
>
>
> On 10.01.19 17:30, Greg Kroah-Hartman wrote:
> > On Thu, Jan 10, 2019 at 04:19:53PM +0100, Oleksij Rempel wrote:
> > > > My gut feel is that if somebody still cares deeply about serial line
> > > > latency, they should look at
On 10.01.19 17:30, Greg Kroah-Hartman wrote:
On Thu, Jan 10, 2019 at 04:19:53PM +0100, Oleksij Rempel wrote:
My gut feel is that if somebody still cares deeply about serial line
latency, they should look at trying to see if they can do some of the
work directly without the bounce to the workq
On Thu, Jan 10, 2019 at 7:19 AM Oleksij Rempel wrote:
>
> It is for industrial low latency RS-422 based application. The loopback
> test is just easy way to test/reproduce it without additional hardware.
>
> What is good, mainlineable way to implement it?
I can easily see that for that specific u
On Thu, Jan 10, 2019 at 04:19:53PM +0100, Oleksij Rempel wrote:
> > My gut feel is that if somebody still cares deeply about serial line
> > latency, they should look at trying to see if they can do some of the
> > work directly without the bounce to the workqueue. We use workqueues
> > for a reaso
On Thu, Jan 10, 2019 at 04:54:53AM -0800, Linus Torvalds wrote:
> On Thu, Jan 10, 2019 at 2:12 AM Oleksij Rempel
> wrote:
> >
> > sched_priority = 1 is enough to dramatically reduce latency
> > on have system load produced by tasks with default user space prio.
>
> .. and is this perhaps a way f
On Thu, Jan 10, 2019 at 2:12 AM Oleksij Rempel wrote:
>
> sched_priority = 1 is enough to dramatically reduce latency
> on have system load produced by tasks with default user space prio.
.. and is this perhaps a way for a user to then make the system spend
inordinate amounts of time in the tty l
sched_priority = 1 is enough to dramatically reduce latency
on have system load produced by tasks with default user space prio.
Signed-off-by: Oleksij Rempel
---
drivers/tty/tty_buffer.c | 12 +++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/tty_buffer.c b/d
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