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From: Robert Hancock <hancockr@shaw.ca>
To: Lapo TIN <lapolapolapo@tin.it>
Cc: james.garcia@lausd.net, linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: smp and irq conflict
Date: Thu, 01 Feb 2007 18:59:53 -0600	[thread overview]
Message-ID: <45C28D09.4030506@shaw.ca> (raw)
In-Reply-To: <45C0FAE300242D46@vsmtp14.tin.it>

Lapo TIN wrote:
> I need to capture at 25 frame per second from each channel...
> So 25 x 8 total frames per second on the pci.
> 
> 
> So do you think I have to change the motherboard ?
> What is important ? the chipset ? is there specification I need ?

What resolution are you using? 720x480 with 24 bits per pixel and 25fps 
will use about 25MB/sec on the PCI bus, there is no way you can keep up 
with 8 channels running on a standard 32-bit 33MHz PCI bus which can 
only transfer 133 MB/sec at most. If you need this much transfer rate, 
you likely need PCI Express or PCI-X capture cards or at least a 
motherboard which has multiple PCI buses (which most desktop boards 
don't typically have).

You may be able to reduce the resolution and/or frame rate in order to 
allow the PCI bus to cope. Also, do you have enough CPU and disk speed 
in order to cope with all these streams?

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@nospamshaw.ca
Home Page: http://www.roberthancock.com/


  reply	other threads:[~2007-02-02  1:04 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <fa.bd33YMixT9/jJwHfbD/DebGgVXs@ifi.uio.no>
2007-02-01 23:29 ` Robert Hancock
2007-02-02  0:04   ` Lapo TIN
2007-02-02  0:59     ` Robert Hancock [this message]
2007-02-02 11:08     ` Erik Mouw
2007-02-14 17:59       ` Manu Abraham
2007-02-01 17:46 Lapo TIN
2007-02-02  4:32 ` Andrew Morton
2007-02-02  5:22   ` Len Brown
2007-02-02 14:52 ` Bill Davidsen
2007-02-05 10:33   ` Benny Amorsen
2007-02-14 16:45     ` Bill Davidsen

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