atom feed17 messages in org.freebsd.freebsd-scsiRe: ahh, I think I see part of the pr...
FromSent OnAttachments
Peter WemmApr 20, 1998 8:01 am 
Justin T. GibbsApr 20, 1998 9:52 am 
Peter WemmApr 20, 1998 10:50 am 
Justin T. GibbsApr 20, 1998 11:18 am 
Justin T. GibbsApr 20, 1998 11:19 am 
Peter WemmApr 20, 1998 12:32 pm 
John KellyApr 20, 1998 3:41 pm 
Justin T. GibbsApr 20, 1998 4:17 pm 
John KellyApr 20, 1998 5:08 pm 
Justin T. GibbsApr 20, 1998 5:17 pm 
Peter WemmApr 20, 1998 10:32 pm 
Justin T. GibbsApr 20, 1998 11:20 pm 
Peter WemmApr 21, 1998 12:17 am 
Peter WemmApr 21, 1998 4:42 am 
Justin T. GibbsApr 21, 1998 10:19 am 
Peter WemmApr 21, 1998 9:06 pm 
Justin T. GibbsApr 21, 1998 9:22 pm 
Subject:Re: ahh, I think I see part of the problem.. (CAM bouncing)
From:Justin T. Gibbs (gib@plutotech.com)
Date:Apr 20, 1998 11:18:00 am
List:org.freebsd.freebsd-scsi

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

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