[106319] in North American Network Operators' Group
Re: Software router state of the art
daemon@ATHENA.MIT.EDU (Florian Weimer)
Sat Jul 26 16:30:37 2008
From: Florian Weimer <fw@deneb.enyo.de>
To: "William Herrin" <herrin-nanog@dirtside.com>
Date: Sat, 26 Jul 2008 22:29:56 +0200
In-Reply-To: <3c3e3fca0807261246p15447c54j4fbbe213eaf745e0@mail.gmail.com>
(William Herrin's message of "Sat, 26 Jul 2008 15:46:50 -0400")
Cc: Petri Helenius <petri@helenius.fi>, Naveen Nathan <naveen@lastninja.net>,
nanog@merit.edu
Errors-To: nanog-bounces@nanog.org
* William Herrin:
> The pro/1000 does not need to generate an interrupt in order to start
> a DMA transfer? Can you refer me to some documents which explain in
> detail how a card on the bus sets up a DMA transfer?
Busmaster DMA does not generate an interrupt on the host CPU. The
interrupt is used to trigger processing on the host CPU; it can be
deferred until several frames have been written.
