Date: Tue, 16 Dec 2008 05:40:08 GMT From: Katsushi Kobayashi <ikob@ni.aist.go.jp> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/118093: firewire bus reset hogs CPU, causing data to be lost Message-ID: <200812160540.mBG5e8QM064669@freefall.freebsd.org>
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The following reply was made to PR kern/118093; it has been noted by GNATS.
From: Katsushi Kobayashi <ikob@ni.aist.go.jp>
To: Dieter <freebsd@sopwith.solgatos.com>
Cc: freebsd-firewire@freebsd.org,
freebsd-drivers@freebsd.org,
bug-followup@freebsd.org
Subject: Re: kern/118093: firewire bus reset hogs CPU, causing data to be lost
Date: Tue, 16 Dec 2008 14:17:10 +0900
Hi,
I believe no side effect is anticipated the message.
"side effect" includes locking i/o.
----
Katsushi Kobayashi
On 2008/12/15, at 4:30, Dieter wrote:
> I found the source of this problem. When a firewire bus resets,
> the firewire driver prints a few lines to the console,
> using printf(9) and device_printf(9). I suspect that these are
> running at splfw aka splimp, locking out other i/o.
>
> Commenting out the *printf() calls fixes the problem, but that
> isn't a good solution.
>
> Would changing the *printf() calls to log(9) calls be safe?
> ("safe" meaning other i/o doesn't get locked out)
>
> Ah, for the good old days when 19200 baud seemed fast...
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