Date: Mon, 20 Apr 1998 12:18:21 -0600 From: "Justin T. Gibbs" <gibbs@plutotech.com> To: Peter Wemm <peter@netplex.com.au> Cc: "Justin T. Gibbs" <gibbs@plutotech.com>, gibbs@FreeBSD.ORG, scsi@FreeBSD.ORG Subject: Re: ahh, I think I see part of the problem.. (CAM bouncing) Message-ID: <199804201822.MAA02724@pluto.plutotech.com> In-Reply-To: Your message of "Tue, 21 Apr 1998 01:50:29 %2B0800." <199804201750.BAA07818@spinner.netplex.com.au>
next in thread | previous in thread | raw e-mail | index | archive | help
>> >Also, there doesn't appear to be anything to stop the DMA counters crossing >> >the dreaded 16MB boundary.. >> >> ??? If you are talking about the problem below, feel free to adjust the >> filter to exclude the pages that may cause a wrap. > >Well, a page won't cause a wrap, but a single dma transfer shouldn't be >allowed to cross the boundary. I wasn't trying to be that specific. If you have the filter reject all pages just above the wrap point, the transfer cannot span the wrap point. This breaks apart transfers that start at that page location as well as those that span it, but it does do what you want without having to but a special case into the code. -- Justin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199804201822.MAA02724>