From: Linus Torvalds <torvalds@linux-foundation.org>
To: Brian Bloniarz <bmb@athenacr.com>
Cc: Chris Wedgwood <cw@f00f.org>, Greg KH <gregkh@suse.de>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>,
Jef Driesen <jefdriesen@telenet.be>,
linux-kernel@vger.kernel.org
Subject: Re: Slow pty's (was Re: libdivecomputer interfaces?)
Date: Thu, 10 Jun 2010 15:30:20 -0700 [thread overview]
Message-ID: <AANLkTikEnVUsO2SjMzDJX7oZjpwYN40dPn4j2i6kPcd8@mail.gmail.com> (raw)
In-Reply-To: <4C116652.8010408@athenacr.com>
On Thu, Jun 10, 2010 at 3:25 PM, Brian Bloniarz <bmb@athenacr.com> wrote:
> On 06/10/2010 02:10 PM, Chris Wedgwood wrote:
>>
>> this might not be related, but i have slow serial ports with NOHZ that
>> goes away when i revert 39c0cbe2150cbd848a25ba6cdb271d1ad46818ad.
>
> Unrelated or not, I think Chris is right about this. Somewhere before
> -rc1, the emulated serial console on my KVM instance became slow
> to echo input. I just tested with the commit reverted and it's
> back to normal.
I suspect it's related. The tty subsystem clearly ends up depending on
the timer tick to move things forward even if there are pending
readers. So I suspect the slowness is very much related to the same
issue.
Linus
next prev parent reply other threads:[~2010-06-10 22:30 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-10 17:25 Linus Torvalds
2010-06-10 18:07 ` OGAWA Hirofumi
2010-06-10 18:10 ` Chris Wedgwood
2010-06-10 22:25 ` Brian Bloniarz
2010-06-10 22:30 ` Linus Torvalds [this message]
2010-06-16 15:03 ` Jiri Kosina
2010-06-16 15:16 ` Mike Galbraith
2010-06-17 6:39 ` Mike Galbraith
2010-06-17 7:00 ` Mike Galbraith
2010-06-17 10:50 ` Mike Galbraith
2010-06-17 13:24 ` Peter Zijlstra
2010-06-17 14:11 ` Thomas Gleixner
2010-06-17 14:14 ` Mike Galbraith
2010-06-17 14:56 ` Brian Bloniarz
2010-06-17 16:02 ` [PATCH] nohz: Fix nohz ratelimit Peter Zijlstra
2010-06-17 17:39 ` [tip:timers/urgent] " tip-bot for Peter Zijlstra
2010-11-12 18:45 ` Slow pty's (was Re: libdivecomputer interfaces?) Jef Driesen
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