Date: Wed, 15 Nov 1995 22:11:44 +0200 From: Heikki Suonsivu <hsu@cs.hut.fi> To: Bruce Evans <bde@zeta.org.au> Cc: hsu@cs.hut.fi, j@uriah.heep.sax.de, current@FreeBSD.org Subject: Re: ISP state their FreeBSD concerns Message-ID: <199511152011.WAA05574@shadows.cs.hut.fi> In-Reply-To: <199511151327.AAA05338@godzilla.zeta.org.au> References: <199511151327.AAA05338@godzilla.zeta.org.au>
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Bruce Evans writes:
> >Yes, but Bruce, why can't we insert the simple #ifndef? It doesn't
> >break anything, but would allow interested people (with a `very
> >special setup') to override it from the config file instead of hacking
> >the sources over and over again.
>
> Because ifdefs are evil and simply changing RS_IBUFSIZE is not sufficient.
> It must satisfy the following:
>
> TTYHOG - 2*RS_IBUFSIZE > 0 (much greater, < TTYHOG/2 would be silly)
Could it be sensible to make RS_IBUFSIZE ((TTYHOG)/4) ? This would allow
tuning TTYHOG value only. It would be a kludge, though. Maybe serial
input should be handled differently from other typical tty processing. I
do not know enough of the tty code to know whether it is useful to increase
TTYHOG value anyway (to me 1k sounds small for any purpose).
> RS_IBUFSIZE - 11520 * (1.0/hz + max_softtty_interrupt_latency) >= 0
Btw, lots of ISDN "modems" like ZyXEL's are connected with overclocked
16650/16550 serial ports. I have one at 460.8k.
--
Heikki Suonsivu, T{ysikuu 10 C 83/02210 Espoo/FINLAND,
hsu@cs.hut.fi home +358-0-8031121 work -4513377 fax -4555276 riippu SN
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