From owner-freebsd-current Wed Mar 25 15:27:55 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id PAA29973 for freebsd-current-outgoing; Wed, 25 Mar 1998 15:27:55 -0800 (PST) (envelope-from owner-freebsd-current@FreeBSD.ORG) Received: from godzilla.zeta.org.au (godzilla.zeta.org.au [203.2.228.19]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id PAA29917 for ; Wed, 25 Mar 1998 15:27:47 -0800 (PST) (envelope-from bde@godzilla.zeta.org.au) Received: (from bde@localhost) by godzilla.zeta.org.au (8.8.7/8.8.7) id KAA29759; Thu, 26 Mar 1998 10:22:51 +1100 Date: Thu, 26 Mar 1998 10:22:51 +1100 From: Bruce Evans Message-Id: <199803252322.KAA29759@godzilla.zeta.org.au> To: ady@warpnet.ro, current@FreeBSD.ORG Subject: Re: silo overflows (Was Re: 3.0-RELEASE?) Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > Likewise, here it is my experience with a CYCLADES Cyclom 16YeP multiport >board & FreeBSD 3.0-971117-SNAP, both UP & SMP case (please nota that I >used the COM ports before installing the multiport board and did get zero >"silo overflow"s; also, setting speed to 115200 rather than 57600 makes >the no. of overflows grow faster): This problem is well known. The PCI version of the cy driver doesn't use fast interrupts, so at 115200 bps, it is likely to drop about N fifos full of input whenever another driver preempts of masks cy interrupts for N+0.5 msec. The keyboard driver usually masks (non-fast) cy interrupts for more than several msec to program the keyboard LEDs; PIO drivers like the PIO wd driver can preempt (non-fast) interrupts for even longer if the disk is fast and the controller is slow... >---------- >Mar 25 19:46:01 ady /kernel: cy0: 1 more silo overflow (total 177) >Mar 25 19:50:26 ady /kernel: cy0: 1 more silo overflow (total 178) >Mar 25 19:50:58 ady /kernel: cy2: 1 more silo overflow (total 13) >Mar 25 20:02:03 ady /kernel: cy0: 1 more silo overflow (total 179) >Mar 25 20:03:11 ady /kernel: cy0: 1 more silo overflow (total 180) It's doing well to get only one at a time :-). Bruce To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message