kern/118093: firewire bus reset hogs CPU,
causing data to be lost
freebsd at sopwith.solgatos.com
Mon Dec 15 21:30:04 PST 2008
The following reply was made to PR kern/118093; it has been noted by GNATS.
From: Dieter <freebsd at sopwith.solgatos.com>
To: freebsd-firewire at freebsd.org, freebsd-drivers at freebsd.org
Cc: bug-followup at FreeBSD.org
Subject: Re: kern/118093: firewire bus reset hogs CPU, causing data to be lost
Date: Sun, 14 Dec 2008 19:30:04 +0000
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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