From: Oliver Neukum <oliver@neukum.org>
To: gene.heskett@verizon.net
Cc: linux-kernel@vger.kernel.org
Subject: Re: OT: Why is usb data many times the cpu hog that firewire is?
Date: Mon, 21 Feb 2005 18:58:34 +0100 [thread overview]
Message-ID: <200502211858.34301.oliver@neukum.org> (raw)
In-Reply-To: <200502211216.35194.gene.heskett@verizon.net>
Am Montag, 21. Februar 2005 18:16 schrieb Gene Heskett:
> Greetings;
>
> Motherboard is a biostar with nforce2 chipset, 2800xp cpu, gig of ram.
>
> I've recently made the observation that while I can view 30fps video
> from my firewire equipt movie camera with a minimal cpu hit of 2-3%,
> but viewing the video from a webcam on a usb 1.1 circuit takes 30-40%
> of the cpu, at half the frame rate.
>
> Do I have something fubar in the usb? Or is this just the nature of
> the beast?
A video stream over usb1.1 must be compressed due to bandwidth available.
Decompression needs cpu.
Regards
Oliver
next prev parent reply other threads:[~2005-02-21 17:58 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-02-21 17:16 Gene Heskett
2005-02-21 17:58 ` Oliver Neukum [this message]
2005-02-21 18:25 ` Gene Heskett
2005-02-21 18:29 ` Wichert Akkerman
2005-02-21 22:08 ` Gene Heskett
2005-02-22 23:10 ` Matt Mackall
2005-02-23 13:13 ` Paulo Marques
2005-02-23 17:15 ` Geert Uytterhoeven
2005-02-21 18:40 ` Paulo Marques
2005-02-21 18:46 ` Oliver Neukum
2005-02-24 11:52 ` David Ford
2005-02-22 8:53 ` Barry K. Nathan
2005-02-22 13:12 ` Gene Heskett
2005-02-23 23:28 ` Bill Davidsen
2005-02-24 23:50 ` H. Peter Anvin
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