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Date: Fri, 08 Aug 2008 21:44:31 +0200 From: Stefan Richter <stefanr@...6.in-berlin.de> To: linux-scsi@...r.kernel.org CC: linux-kernel@...r.kernel.org Subject: Scatter-gather segment merges by IOMMU? Hi all, the block layer usually tries to merge s/g segments if consecutive segments combined fit into the queue's max_segment_size. When such a scatter gather list is DMA-mapped, can it happen that an IOMMU collapses the elements even further, so that sg_dma_len() of a DMA-mapped s/g segment exceeds max_segment_size? As I understood some discussions in the past, this could indeed happen, which is a nuisance. But I may have misunderstood something, or something may have changed in the meantime... -- Stefan Richter -=====-==--- =--- -=--- http://arcgraph.de/sr/ -- 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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