Date: Wed, 3 Jan 2001 14:22:36 +0300 From: "Artem Koutchine" <matrix@ipform.ru> To: <questions@FreeBSD.ORG> Cc: <hardware@FreeBSD.ORG> Subject: Port access is too slow Message-ID: <013f01c07578$41e18d40$0c00a8c0@ipform.ru>
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Hello! I have succesfully accessed io port by opening /dev/io and using some inb, outb from machine/cpufunc.h. I am using to to control an LCD display connected to parallel port using WimAMP schematics. I tested the LCD on windows before and it works fast and reliable. Now, when i ported to source code to freebsd it still work reliably, but it because way too slow. Before that i needed 40 microseconds delays inserted when sending data to the port, but now i can even call 4 nanoseconds (NANO!) nanosleep() and get the proper output, which is very weird. I seems as IO operations a very slow by themselves in FreeBSD. Is it true? Or I am doing something wrong? Artem To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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