On Mon, Jan 26, 2009 at 9:05 PM, Barney Cordoba <barney_cordoba_at_yahoo.com> wrote: > I have a problem with the ixgbe driver, where bus_dmamap_load_mbuf_sg() is > failing. The underlying failure is reserve_bounce_pages(). It seems that > there aren't any bounce pages allocated. What could be the cause of this? Is there some tunable? I don't think the hardware supported ixgbe(4) will need bounce pages on RX/TX buffers (according to data sheet, the hardware supports full 64bits address space accessing and no alignment constraints on RX/TX buffer start address). However, the driver's buffer busdma is kinda misconfigured: in ixgbe_allocate_{transmit,receive}_buffers(), the buffers' alignment is set to PAGE_SIZE (?!), this means that almost all TX/RX operation will require bouncing. The best case is poor performance due to additional and unnecessary memory copy in bus_dmamap_sync(); the worst case is completely unfunction NIC due to RX ring could not be filled during ifnet.if_init(). Best Regards, sephe -- Live Free or DieReceived on Mon Jan 26 2009 - 13:21:59 UTC
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