Re: Ready or not?

From: M. Warner Losh (imp_at_bsdimp.com)
Date: 07/30/04

  • Next message: Ruslan Ermilov: "Re: How to clean out old files after 'make world'?" 
    Date: Thu, 29 Jul 2004 23:55:08 -0600 (MDT)
To: freebsd-hackers@freebsd.org, pawmal-posting@freebsd.lublin.pl

    In message: <20040729201909.GA12370@shellma.zin.lublin.pl>
                Pawel Malachowski <pawmal-posting@freebsd.lublin.pl> writes:
    : On Wed, Jul 28, 2004 at 03:02:38PM +0200, Max Laier wrote:
    :
    : Hello,
    :
    : > as PF+ALTQ gateway in production environment. For ALTQ there is the problem
    : > of "will your driver be supported?".
    :
    : Could You please explain a bit, why ALTQ model is placed so close
    : to network adapter driver (that they have to be modified) instead
    : of placing it in upper layers (and leaving NIC drivers untouched)?

    The short answer is because there is buffering (queueing) in the NIC
    layer, and that limits the ability of of ALTQ to do its job. In order
    to do QoS type things, this queueing makes it harder without the help
    of the NIC driver. It is more complicated than this (I don't
    understand all the details), but that is the jist of a larger
    presentation of ALTQ that I had the pleasure of viewing at
    AsiaBSDcon.

    Warner
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  • Next message: Ruslan Ermilov: "Re: How to clean out old files after 'make world'?"

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