David Christensen wrote this message on Tue, Jul 17, 2007 at 16:54 -0700: > I'm investigating a problem with my bce driver which occurs when I ask > for a jumbo > mbuf cluster (through m_cljget()). When I map the memory for DMA I > normally > get 3 memory segments (4KB + 4KB + 1KB) on my system, but on another > user's > system he's seeing 2 memory segments (8KB + 1KB). Is there a > configuration > option that allows this or some other tuning variable involved? The > system is a > Xeon dual-core processor and has 8GB of RAM, running an AMD64 version of > the kernel. Is this an issue? If it is, you need to fix your bus_dma_tag_create calls to set the segment size and count properly. bus_dma will get you exactly what you ask for, and your driver needs to tell bus_dma what it can and cannot handle. -- John-Mark Gurney Voice: +1 415 225 5579 "All that I will do, has been done, All that I have, has not."Received on Tue Jul 17 2007 - 22:45:32 UTC
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