Date: Thu, 5 Mar 1998 16:31:54 +0600 (NS) From: Ustimenko Semen <semen@iclub.nsu.ru> To: Mike Smith <mike@smith.net.au> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: Are mbufs aligned or bounded on something? Message-ID: <Pine.BSF.3.96.980305162255.18429A-100000@iclub.nsu.ru> In-Reply-To: <199803042234.OAA22577@dingo.cdrom.com>
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Hello! On Wed, 4 Mar 1998, Mike Smith wrote: > Unless it explicitly matters to your hardware, you should assume that > mbuf clusters are aligned to suit the architecture you're running on. > > If it *does* matter to your hardware, I would be inclined to suggest > that you code to handle all situations, and optimise for the case where > the alignment best suits you. This will greatly improve the > portability of your code. > It realy touch hardware becouse i pass physical address of mtod( caddr_t, mbuf) to hardware, and if it cross the PAGE_SIZE, DMA operation will overwrite some physical address that do not belong to mbuf data area:( To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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