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Old 02-01-2011, 04:41 AM   #1
rajeshverma38
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Registered: Aug 2010
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Thumbs up 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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