From owner-freebsd-hackers  Thu Jul 26 11: 1: 2 2001
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Date: Thu, 26 Jul 2001 14:04:37 -0400
From: Bosko Milekic <bmilekic@technokratis.com>
To: Terry Lambert <tlambert2@mindspring.com>
Cc: Alfred Perlstein <bright@mu.org>,
	Zhihui Zhang <zzhang@cs.binghamton.edu>,
	vishwanath pargaonkar <vishubp@yahoo.com>,
	freebsd-hackers@FreeBSD.ORG
Subject: Re: cluster size
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References: <20010725140737.A25132@technokratis.com> <Pine.SOL.4.21.0107251416550.21505-100000@opal> <20010725143649.A25300@technokratis.com> <3B6050D1.9DCCD23@mindspring.com> <20010726133617.B33517@technokratis.com> <20010726123900.E26571@elvis.mu.org> <3B6058AC.32F6B2EB@mindspring.com>
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In-Reply-To: <3B6058AC.32F6B2EB@mindspring.com>; from tlambert2@mindspring.com on Thu, Jul 26, 2001 at 10:51:40AM -0700
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On Thu, Jul 26, 2001 at 10:51:40AM -0700, Terry Lambert wrote:
> Alfred Perlstein wrote:
> > > On Thu, Jul 26, 2001 at 10:18:09AM -0700, Terry Lambert wrote:
> > > > The real reason behind all this is to make the input and output
> > > > routines symmetric, since mbuf's can be allocated at interrupt,
> > > > and clusters can't (or couldn't, last time I looked at 4.3).
> > >
> > >       They can. Whether they are or not I'm not sure.
> > 
> > Er, wouldn't that be the only way for cards to refil thier DMA
> > recieve buffers?
> 
> Look at the Tigon II and FXP drivers.  The allocations in
> the macros turn into m_get, not m_clusterget.

	From if_fxp.c (fxp_add_rfabuf(), sometimes called from fxp_intr()):

	MGETHDR(...);  <-- get mbuf
	if (m != NULL) {
		MCLGET(...); <-- get cluster
		...
	}
 
> -- Terry

-- 
 Bosko Milekic
 bmilekic@technokratis.com


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