From owner-freebsd-smp Thu Sep 7 17:50:59 2000 Delivered-To: freebsd-smp@freebsd.org Received: from gidora.zeta.org.au (gidora.zeta.org.au [203.26.10.25]) by hub.freebsd.org (Postfix) with SMTP id 7132737B424 for ; Thu, 7 Sep 2000 17:50:54 -0700 (PDT) Received: (qmail 2174 invoked from network); 8 Sep 2000 00:50:50 -0000 Received: from unknown (HELO bde.zeta.org.au) (203.2.228.102) by gidora.zeta.org.au with SMTP; 8 Sep 2000 00:50:50 -0000 Date: Fri, 8 Sep 2000 11:50:45 +1100 (EST) From: Bruce Evans X-Sender: bde@besplex.bde.org To: Warner Losh Cc: The Hermit Hacker , freebsd-current@FreeBSD.ORG, freebsd-smp@FreeBSD.ORG Subject: Re: 'interrupt-level buffer overflows' for sio device? In-Reply-To: <200009072129.PAA06098@harmony.village.org> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-smp@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On Thu, 7 Sep 2000, Warner Losh wrote: > In message The Hermit Hacker writes: > : sio1: 32 more interrupt-level buffer overflows (total 32) > > >From the man page: > sio%d: interrupt-level buffer overflow. Problem in the bottom half of > the driver. > > This likely means that the bottom half of sio isn't running fast > enough to harvest the characters in the interrupt level buffers. This means that fast interrupt handlers aren't actually fast. Especially if it occurs for slow devices like mouses. Even slow interrupt handlers had about 10 times lower latency than necessary for 1200 bps serial mouses. Bruce To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message