Unable to allocate more than4MB DMA memory
hi to all!
I am working on DL580G5 server having Xeon process with RHEL 4.5 OS.
My device driver requires huge amount of DMA memory. when I am allocating DMA memory more than 4 MB, then memory allocation fails. when i am using same module with same Machine having RHEL 5.4 , everything goes fine. I am forced to use RHEL 5.4 . please help me how i can Increase the Maximum allowable size of DMA memory. Either by passing some kernel parameter or change in some configuration file. i have already tried with kernel paramer " iommu=soft swiotlb= ***". Its also not working.
thanks in advance
rajesh varma
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