From owner-freebsd-current Mon Aug 12 12:20:57 2002 Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.FreeBSD.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 4D49A37B400 for ; Mon, 12 Aug 2002 12:20:51 -0700 (PDT) Received: from mailman.zeta.org.au (mailman.zeta.org.au [203.26.10.16]) by mx1.FreeBSD.org (Postfix) with ESMTP id 57ACD43E3B for ; Mon, 12 Aug 2002 12:20:50 -0700 (PDT) (envelope-from bde@zeta.org.au) Received: from bde.zeta.org.au (bde.zeta.org.au [203.2.228.102]) by mailman.zeta.org.au (8.9.3/8.8.7) with ESMTP id FAA11329; Tue, 13 Aug 2002 05:20:19 +1000 Date: Tue, 13 Aug 2002 05:25:21 +1000 (EST) From: Bruce Evans X-X-Sender: bde@gamplex.bde.org To: Maksim Yevmenkin Cc: Maksim Yevmenkin , Subject: Re: Interrupt vs. polling on -current In-Reply-To: <3D57EFDB.94242A71@exodus.net> Message-ID: <20020813051700.M25922-100000@gamplex.bde.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Mon, 12 Aug 2002, Maksim Yevmenkin wrote: > Bruce Evans wrote: > > > > On Sun, 11 Aug 2002, Maksim Yevmenkin wrote: > [...] > > > > BTW, i see "silo overflow" messages when i run ppp via null-modem > > > cable. in this configuration i'm using serial port 0 which is on > > > board and hase irq 4 with fast interrupts. > > > > What else is active when you get these? > > not much: X, user space ppp and i'm doing moderate size transfers > via ftp between my current laptop and FreeBSD 4.5 desktop. i also > see these errors while cvsup'ing my -current laptop. Some graphics cards can cause sio problems, by using too bus cycles so that sio doesn't get even an average of about 5 i/o cycles per character time that it needs to function. 5 might sound like not many, but it is 5 isa cycles so it takes 6 usec every 87 usec at 115200 bps. 20 devices wanting that much of the bus just won't work. Bruce To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message