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List:       linux-kernel
Subject:    Re: Slow pty's (was Re: libdivecomputer interfaces?)
From:       Linus Torvalds <torvalds () linux-foundation ! org>
Date:       2010-06-10 22:30:20
Message-ID: AANLkTikEnVUsO2SjMzDJX7oZjpwYN40dPn4j2i6kPcd8 () mail ! gmail ! com
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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
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