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LWN.net Weekly Edition for May 23, 2013
An "enum" for Python 3
An unexpected perf feature
LWN.net Weekly Edition for May 16, 2013
A look at the PyPy 2.0 release
Do all (most) Ethernet adapters support scatter-gather DMA ?
What about other headers?
Posted Jul 26, 2006 19:11 UTC (Wed) by dlang (✭ supporter ✭, #313)
Posted Jul 27, 2006 1:11 UTC (Thu) by mikov (subscriber, #33179)
Is there equivalent functionality in Intel's chipsets (since they can't put it in the CPU) ? If not, it doesn't seem prudent to rely on it for zero-copy.
Posted Jul 27, 2006 1:51 UTC (Thu) by dlang (✭ supporter ✭, #313)
however this just means that the kernel and drivers have to fall back to the non-zero-copy mechanism if the hardware doesn't support scatter-gather nativly
it's a matter of useing it if it's there, and doing the best you can if it's not (and remember that if you compile the kernel for Opteron-only as opposed to K8 architecture you get more performance becouse you get to leave out the tests for the IOMMU and the code to handle it, so it doesn't always cost you :-)
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