Date: Tue, 13 Apr 1999 18:02:51 -0400 From: Dennis <dennis@etinc.com> To: Mike Smith <mike@smith.net.au> Cc: hackers@freebsd.org Subject: Re: PCI burst determination Message-ID: <199904132309.TAA07157@etinc.com> In-Reply-To: <199904132127.OAA01257@dingo.cdrom.com> References: <Your message of "Tue, 13 Apr 1999 09:21:20 EDT." <199904131427.KAA03942@etinc.com>
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At 02:27 PM 4/13/99 -0700, Mike Smith wrote: >> >> Is there a way to determine the max burst of the PCI bridge on the >> MB for controller optimization? I dont see a fuction...is it stored >> somewhere? > >PCI is arbitrated with a latency timer, so there is no maximum burst >length per se. As for limitations in the bridge chipset, you're >probably going to want to look up the documentation for the individual >bridges. > >However, having said, that, as a general rule with PCI bursting "longer >is better". Well, mike, the goal of my question was to be able to dynamically determine the burst rate of the bridge installed to tune it at config time, allowing for automatic optimization. Dennis To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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