From: Mathieu Desnoyers <compudj@krystal.dyndns.org>
To: Jon Smirl <jonsmirl@gmail.com>
Cc: linux-kernel@vger.kernel.org, ltt-dev@shafik.org
Subject: Re: Interrupts disabled for too long in printk
Date: Wed, 7 Jun 2006 22:31:02 -0400 [thread overview]
Message-ID: <20060608023102.GA22022@Krystal> (raw)
In-Reply-To: <9e4733910606071837l4e81c975t8d531ed9810af60f@mail.gmail.com>
* Jon Smirl (jonsmirl@gmail.com) wrote:
> You can look at this problem from the other direction too. Why is it
> taking 15ms to get between the two points? If IRQs are off how is the
> serial driver getting interrupts to be able to display the message? It
> is probably worthwhile to take a look and see what the serial console
> driver is doing.
Hi John,
The serial port is configured at 38000 bauds. It can therefore transmit 4800
bytes per seconds, for 72 characters in 15 ms. So the console driver would be
simply busy sending characters to the serial port during that interrupt
disabling period.
Mathieu
OpenPGP public key: http://krystal.dyndns.org:8080/key/compudj.gpg
Key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
next prev parent reply other threads:[~2006-06-08 2:31 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-03 11:19 Interrupts disabled for too long in printk Mathieu Desnoyers
2006-06-03 21:43 ` Steven Rostedt
2006-06-08 1:09 ` Mathieu Desnoyers
2006-06-08 1:37 ` Jon Smirl
2006-06-08 2:31 ` Mathieu Desnoyers [this message]
2006-06-08 2:35 ` Jon Smirl
2006-06-08 10:24 ` linux-os (Dick Johnson)
2006-06-08 14:38 ` Jon Smirl
2006-06-08 15:17 ` linux-os (Dick Johnson)
2006-06-08 15:45 ` Jon Smirl
2006-06-08 18:34 ` Miquel van Smoorenburg
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