From: One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>
To: Jiri Slaby <jslaby@suse.cz>
Cc: gregkh@linuxfoundation.org, linux-serial@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/1] serial: 8250, disable "too much work" messages
Date: Wed, 2 Apr 2014 17:43:42 +0100 [thread overview]
Message-ID: <20140402174342.1f78a39e@alan.etchedpixels.co.uk> (raw)
In-Reply-To: <533BDC4F.3060903@suse.cz>
> So, according to Takashi's measurements, we would need over 15000 loops
> on a single port. Of course, this value is highly dependent on a system.
> On my system, it is like 7 times lower (2100). And it lasts ~300ms here.
>
> I suppose a limit like 32k loops is way too much and I just should go
> and implement the polling. Or what about adding inter-character sleeps
> to qemu to correspond to the speed? I can do that too, but I am not sure
> if limiting the throughput will be accepted by them.
The other option would be to detect qemu as a buggy uart, log a warning
and ignore the test on it. I think polling might be better, and that
would probably fix hang cases on real buggy uarts where right now we
sometimes keel over.
prev parent reply other threads:[~2014-04-02 16:43 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-01 11:37 [PATCH 1/1] serial: 8250, disable "too much work" messages Jiri Slaby
2014-04-01 12:43 ` Takashi Iwai
2014-04-01 13:40 ` One Thousand Gnomes
2014-04-02 9:45 ` Jiri Slaby
2014-04-02 16:43 ` One Thousand Gnomes [this message]
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