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Subject: Re: Gigabit IDS solutions
From: Robert Graham (robert_david_grahamYAHOO.COM)
Date: Wed Nov 15 2000 - 13:28:45 CST

Elliot,

When you say that TurboPacket does only a single copy (rather than the multiple
copies that most operating systems do), what does that mean? A lot of IDSs are
moving to the technique whereby the adapter DMAs the data directly into memory
without intervention from the CPU. Is this how TurboPacket works, or does the
CPU copy the bytes? I know that Theo is writing OpenBSD so that everything is
DMAed directly to memory; I'm curious as to how TuberPacket compares to this.

I'm still trying to figure out how to describe the DMA step. Do you call it
"zero-copy" or "one-copy" (or maybe "DMA-copy"?).

=====
Robert Graham
Personal: http://www.robertgraham.com Work: CTO Network ICE

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