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Date: Thu, 12 Jun 2008 17:14:49 -0400 (EDT) From: Alan Stern <stern@...land.harvard.edu> To: Jens Axboe <jens.axboe@...cle.com> cc: AntonioLin <antonio.lin@...ormicro.com>, David Vrabel <david.vrabel@....com>, USB list <linux-usb@...r.kernel.org>, Kernel development list <linux-kernel@...r.kernel.org> Subject: Re: [S] Re: [linux-uwb] packet size problem On Wed, 11 Jun 2008, Jens Axboe wrote: > > Jens, this is a question for you. How come we're getting an SG element > > whose lenth is 3584 when the request_queue's dma_alignment mask is set > > to 1023? Is dma_alignment not the right parameter to set? > > dma_alignment mask is the buffer address alignment, so they are not > completely the same. But it does sound odd, since you would then be > spanning two pages for that sg element. Is this before or after dma > mapping the sg table? Any followup on this? Is there a different way to request that each SG element (except the last) has length divisible by 1024, other than setting the dma_alignment mask to 1023? Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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