linux-kernel - Re: RFC: Network privilege separation.

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Message-ID: <20090112202726.GA2169@ioremap.net>
Date:	Mon, 12 Jan 2009 23:27:26 +0300
From:	Evgeniy Polyakov <zbr@...emap.net>
To:	Rémi Denis-Courmont <rdenis@...phalempin.com>
Cc:	Andi Kleen <andi@...stfloor.org>, Valdis.Kletnieks@...edu,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Michael Stone <michael@...top.org>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: RFC: Network privilege separation.

On Mon, Jan 12, 2009 at 10:15:27PM +0200, Rémi Denis-Courmont (rdenis@...phalempin.com) wrote:
> > I don't think that's given. It would need some restructuring,
> > but I think the end result would be likely worth it.
> 
> A normal DVD would be over 30 megabytes per seconds once decoded, just for the 
> video. And remember vmsplice() is not allowed by SECCOMP. Media players have 
> assembly-coded memory copy optimizations (like the kernel) for some reason.

Just a note: memory copy is way too faster than 30 mb/s, and very likely
it is not the memory copy, but (de)compression, since likely all modern
codecs are limited by the CPU and not the memory bandwidth.

-- 
	Evgeniy Polyakov
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