Date: Fri, 4 Dec 1998 12:28:57 -0800 (PST) From: Archie Cobbs <archie@whistle.com> To: freebsd-hackers@FreeBSD.ORG Subject: Help with clist_alloc_cblocks() Message-ID: <199812042028.MAA06497@bubba.whistle.com>
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Hello,
I'm trying to write a line discipline, roughly similar to the PPP
line discipline. My question is, what are the correct parameters to
give to clist_alloc_cblocks()?
/*
* Pre-allocate cblocks to the an appropriate amount.
*/
ttyflush(tp, FREAD | FWRITE);
clist_alloc_cblocks(&tp->t_canq, 0, 0);
clist_alloc_cblocks(&tp->t_rawq, 0, 0); /* XXX probably wrong! */
clist_alloc_cblocks(&tp->t_outq, MLEN + NGT_HIWATER, MLEN + NGT_HIWATER);
I'm not sure how to determine what the correct values to call
clist_alloc_cblocks() should be. The values I'm using now cause a
bunch of "interrupt-level buffer overflows" reported from the sio
driver. It looks like I can simply increase the values for tp->t_rawq
but I'd like to understand exactly what they mean first.
Thanks,
-Archie
___________________________________________________________________________
Archie Cobbs * Whistle Communications, Inc. * http://www.whistle.com
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