05-05-2011
Quote:
Originally Posted by
Corona688
Then the problem has nothing to do with that line. -O3 by itself doesn't cause it to crash. However it can expose latent bugs in your program. This is an extremely poor design and I can't guarantee anything about it. Given the way modern systems work I can't even guarantee you're actually talking to I/O ports. Is it possible to use an actual device driver instead?
So that means using -O3 in multi-threading is a bad idea?
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AHB(4) BSD Kernel Interfaces Manual AHB(4)
NAME
ahb -- Adaptec EISA SCSI host adapter driver
SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file:
device scbus
device ahb
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
ahb_load="YES"
DESCRIPTION
This driver provides access to the SCSI bus connected to an Adaptec AHA-174X host adapters in ``enhanced'' mode. Tagged queueing and syn-
chronous SCSI transfers are supported.
HARDWARE
The ahb driver supports the following SCSI host adapters:
o Adaptec AHA-1740
o Adaptec AHA-1742
o Adaptec AHA-1740A
o Adaptec AHA-1742A
CAVEATS
The Adaptec 174X is very sensitive to SCSI bus termination and cable length. It may also have difficulties operating with some modern
devices that, due to their speed, expose timing problems in the controller. There are no known mechanisms for working around device incom-
patibilities of this nature.
SEE ALSO
aha(4), ahc(4), aic(4), cd(4), da(4), sa(4), scsi(4)
AUTHORS
The ahb driver was written by Justin T. Gibbs.
BSD
July 4, 2004 BSD