From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Oleksij Rempel <o.rempel@pengutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Jiri Slaby <jslaby@suse.com>,
Pengutronix Kernel Team <kernel@pengutronix.de>,
lkml <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v1 3/3] drivers/tty: increase priority for tty_buffer_worker
Date: Thu, 10 Jan 2019 17:30:30 +0100 [thread overview]
Message-ID: <20190110163030.GB19693@kroah.com> (raw)
In-Reply-To: <20190110151953.qpat4t7lat6plfk6@pengutronix.de>
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 reason, but it's possible that some of it could be avoided at
> > least in special cases... And yours sounds like a special case.
>
> 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?
What is the real problem your systems are having? Are they serial-port
limited? Is latency a big issue? Trying to tune for a fake workload
isn't the best way to solve anything :)
thanks,
greg k-h
next prev parent reply other threads:[~2019-01-10 16:30 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-10 10:12 [PATCH v1 0/3] reduce tty latency Oleksij Rempel
2019-01-10 10:12 ` [PATCH v1 1/3] drivers/tty: refactor functions for flushing/queuing work Oleksij Rempel
2019-03-11 8:16 ` Alexander Sverdlin
2019-01-10 10:12 ` [PATCH v1 2/3] drivers/tty: convert tty_port to use kthread_worker Oleksij Rempel
2019-03-11 8:23 ` Alexander Sverdlin
2019-01-10 10:12 ` [PATCH v1 3/3] drivers/tty: increase priority for tty_buffer_worker Oleksij Rempel
2019-01-10 12:54 ` Linus Torvalds
2019-01-10 15:19 ` Oleksij Rempel
2019-01-10 16:30 ` Greg Kroah-Hartman [this message]
2019-01-28 8:05 ` Oleksij Rempel
2019-01-28 8:23 ` Greg Kroah-Hartman
2019-01-28 9:22 ` Oleksij Rempel
2019-01-28 20:03 ` Linus Torvalds
2019-01-28 20:13 ` Linus Torvalds
2019-01-10 16:59 ` Linus Torvalds
2019-03-11 8:24 ` Alexander Sverdlin
2019-01-10 13:51 ` [PATCH v1 0/3] reduce tty latency Greg Kroah-Hartman
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