Date: Sat, 1 May 2004 10:27:05 +0200 From: Burkard Meyendriesch <bm@malepartus.de> To: othermark <atkin901@yahoo.com> Cc: freebsd-current@freebsd.org Subject: Re: sio: lots of silo overflows on Asus K8V with Moxa Smartio C104H/PCI solved Message-ID: <20040501102705.7a7ec726.bm@malepartus.de> In-Reply-To: <c6u3nd$f8q$1@sea.gmane.org> References: <20040426111754.38a855c4.bm@malepartus.de> <20040426233925.Y5300@gamplex.bde.org> <20040430102504.477152ce.bm@malepartus.de> <c6u3nd$f8q$1@sea.gmane.org>
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On Fri, 30 Apr 2004 10:51:41 -0700 othermark wrote: > > Burkard Meyendriesch wrote: > > > > Meanwhile I plugged the Moxa board into another PCI slot of my > > motherboard and the conflict with the ata6 interrupt seems to be > > solved. The silo over- flows are still there. > > > > By the way: How should I set the BIOS parameters "PCPI 2.0 yes/no" > > and"ACPI APIC yes/no"? Do they have anything to do with the PCI > > interrupt behaviour? > > I had to enable APIC to get my puc supported card to work. W/o it the > interrupts were shared and I received a ton of silo overflows and lost > data on line. > > so try the following in your kernel and rebuild > > options COM_MULTIPORT > options PUC_FASTINTR > > device apic > Thanks for the hint, this solves my problem. I now have a constant char input flow rate of about 11000 chars/s at 115200 bps. This makes an average interupt rate of 1400 ints/s, so each interrupt service gets about 8 input chars of the silo. With a 16[45]50 silo size of 16 chars this seems to be a reasonable rate. All the silo overflow warnings disappeared. Btw, "device apic" doesn't exist; did you mean "device acpi"? Burkard -- Burkard Meyendriesch Stevern 2 D-48301 Nottuln
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