On Thu, Jul 21, 2011 at 11:48 PM, mindentropy <mindentropy@xxxxxxxxx> wrote: >>Sorry to kicks in... > Was wondering where you were :) > >>hm, quite likely you run out of contigous virtual address space that >>as big as you requested... in above, you requested 16 MiB, right? > > Not virtual address space but physical page frames. Yes I requested 16MB. > I want a huge chunk for dma for a high bandwidth pcie(16GB/s!) device . I am > thinking in terms of no scatter gather but generally any sane device would > have one. > do you see any performance implication of scatter-gather? I think unless you reach limits, performance should not vary much. Just curious to know what sort of device it is targeting 16GB/s? _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
