Date: Sun, 17 May 1998 10:31:06 -0400 (EDT) From: Jt <hometeam@techpower.net> To: Julian Elischer <julian@whistle.com> Cc: questions@FreeBSD.ORG Subject: Re: sio driver Message-ID: <Pine.BSF.3.96.980517101519.1143A-100000@techpower.net> In-Reply-To: <Pine.BSF.3.95.980517103625.17761E-100000@current1.whistle.com>
next in thread | previous in thread | raw e-mail | index | archive | help
Yes I set the for 3.6864 MHz which is the 230000 and it works
just the overflow errors. If I set for 1.8432 which is the standard
for 115200 16550 it works fine though I get no performance increase.
Frequency select is 1.8, 3.6, or 7.3
These 16650 I can set the clock on them. allthough without the driver
that comes with them . I can get the 32 byte receive buffer and the
upsteam at 16 byte . So I could change the value in the kernel ?
Only differance in the 16550 & 16650 is the 32 byte transmit buffer.
on this card the receive buffer is allways 32 byte .
hometeam@techpower.net
--We cannot all be masters, nor all masters
Cannot be truly follow'd--
-----BEGIN PGP MESSAGE-----
Version: 2.6.2
owEBqwBU/4kAlQMFADRCxNWhsddKSTR+6QEBelED/jzeC3btZfqSdIfrNoCgwUJJ
iNQ33UQoMyJ2ygkfl72xP5J79yml/F4P73GnNaDVbaMOmOG2NNAi5ElE73wRh54U
17kH+n5XnYeqekV8T2TG2Q6ex3UotXPyZ1vvrCrSxapOz6a4hh0GQeA55rcwLy2W
ROHwxfvaVsrX5iVOkRoerBFiC21lc3NhZ2UudHh0AAAAAA==
=jCvF
-----END PGP MESSAGE-----
On Sun, 17 May 1998, Julian Elischer wrote:
>
>
> On Sun, 17 May 1998, Jt wrote:
>
> >
> > Yeah I was trying for the 230000 I am isdn that was the whole
> > purpose of the 16650 to increase thoughput.
> > jkh mention that freebsd could handle 230 no problem just the 115000
> > 16550 was the restriction. it runs in windows 95 fine on the 230000
> > settings. If I where able to get no speed change I would stay at
> > 115000. Are you also isdn?
> >
> A you COULD fix it by recompiling the kernel with the HZ value set to 200
> intead of 100. or you could do what we did which is to get a uart with 32
> byte fifo's instead of 16.
>
> the trouble is that the serial devices are not REALLY
> interrupt driven, but run by the clock (it's a long story).
>
> 16 bytes at 230K is < 10mSec (the Hz ia 100Hz)
>
>
> julian
>
>
>
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-questions" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.BSF.3.96.980517101519.1143A-100000>