Date: Mon, 9 Nov 1998 12:18:07 -0800 (PST) From: Julian Elischer <julian@whistle.com> To: "Larry S. Lile" <lile@stdio.com> Cc: David Greenman <dg@root.com>, hackers@FreeBSD.ORG Subject: Re: mbuf question Message-ID: <Pine.BSF.3.95.981109121611.13494E-100000@current1.whistle.com> In-Reply-To: <Pine.BSF.3.96.981109103125.26563D-100000@heathers.stdio.com>
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you can allocate a pool of buffers and attach them to the mbufs using th eexternal pointer feature, and supply your own free and duplicate functions. I have done this under BSD since 1990 works like a charm.. (In my case the buffers were on the ethernet cards (2MB on each card)) julian On Mon, 9 Nov 1998, Larry S. Lile wrote: > > > On Mon, 9 Nov 1998, David Greenman wrote: > > > >Are mbufs allocated below the 16M area? > > > > > >If they are, is it likely to change? > > > > > >Why? Because I am trying to eliminate bcopy's and mallocs in my > > >token-ring driver to gain a little more performance. > > > > They're allocated throughout the machine's physical address space. > > I was afraid of that, so I should just make new buffers and copy when > I need DMA'able memory. Otherwise I can just use the mbuf's directly. > > Thanks! > > Larry Lile > lile@stdio.com > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hackers" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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