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From: Robert Hancock <>
To: Lapo TIN <>
Cc:, linux-kernel <>
Subject: Re: smp and irq conflict
Date: Thu, 01 Feb 2007 18:59:53 -0600	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

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
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  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/>
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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