Date: Thu, 14 Sep 2000 16:53:59 -0400 (EDT) From: Bosko Milekic <bmilekic@dsuper.net> To: Charles Richmond <cmr@sitaranetworks.com> Cc: freebsd-net@FreeBSD.ORG Subject: RE: Clusters larger than PAGE_SIZE and contigmalloc() Message-ID: <Pine.BSF.4.21.0009141652480.4751-100000@jehovah.technokratis.com> In-Reply-To: <31269226357BD211979E00A0C9866DABE411F5@rios.sitaranetworks.com>
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On Thu, 14 Sep 2000, Charles Richmond wrote: > So maybe I am being blind on this, but... > > It seems to me if the mbuf clusters cross page boundaries > in an unaligned fashion as the earlier suggestion of 8 X 1.5k > would do or if the size is privately configurable and thus not > guaranteed to align, then the DMA code is forced into a scatter > gather mode, even if the actual pages are contiguous. Can someone > clear up my blindness? > > Charlie I'm unsure of what the DMA code is forced to do, but there are likely alignment problems with the buffer that will cross the page boundry. Bosko Milekic bmilekic@technokratis.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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