From owner-freebsd-multimedia Sat Sep 12 05:22:05 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id FAA27897 for freebsd-multimedia-outgoing; Sat, 12 Sep 1998 05:22:05 -0700 (PDT) (envelope-from owner-freebsd-multimedia@FreeBSD.ORG) Received: from labinfo.iet.unipi.it (labinfo.iet.unipi.it [131.114.9.5]) by hub.freebsd.org (8.8.8/8.8.8) with SMTP id FAA27890 for ; Sat, 12 Sep 1998 05:22:01 -0700 (PDT) (envelope-from luigi@labinfo.iet.unipi.it) Received: from localhost (luigi@localhost) by labinfo.iet.unipi.it (8.6.5/8.6.5) id MAA20689; Sat, 12 Sep 1998 12:30:01 +0200 From: Luigi Rizzo Message-Id: <199809121030.MAA20689@labinfo.iet.unipi.it> Subject: Re: NogaTech PCMCIA video cards To: nate@mt.sri.com (Nate Williams) Date: Sat, 12 Sep 1998 12:30:01 +0200 (MET DST) Cc: pusateri@juniper.net, freebsd-multimedia@FreeBSD.ORG In-Reply-To: <199809112200.QAA14278@mt.sri.com> from "Nate Williams" at Sep 11, 98 04:00:07 pm X-Mailer: ELM [version 2.4 PL23] Content-Type: text Sender: owner-freebsd-multimedia@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org > FWIW, a PCMCIA camera has *TONS* more bandwidth and *TONS* less good to hear that. but just for curiosity, how much more bw ? I guess the ISA bus tops at some 4Mbyte/s, a 33 MHz, 32-bit PCI bus can do 133 Mbytes/s during burst transfers, and 320x240x30fps YUV16 video should be around 5MB/s. > We used a parallel port camera for awhile, but the performance and load > on the system became so bad that we were forced to switch to a PCMCIA > camera, which works much nicer. (Note, this is under Win95, but the > hardware issues are the same as in FreeBSD.) well for the paraller port thing, a poor driver can make a lot of difference. I rememver using a quickcam with vic under FreeBSD, and the system was still usable on a 486/66 with the user space driver whereas a P5-133 was doing terribly using a kernel space driver (essentially the reason was, the kernel driver was/is not preemptable, so even mouse/keyboard interrupts had to wait!) cheers luigi To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-multimedia" in the body of the message