Monday, January 15, 2018 1:34 PM, Ferruh Yigit: > >> Currently no PMD seems implemented it. > > > > Sure, > > > > FAST_FREE offload is the logical AND between the old txqflags of: > > ETH_TXQ_FLAGS_NOREFCOUNT > > ETH_TXQ_FLAGS_NOMULTMEM > > > > The offload is just a performance optimization. As specified in the > documentation [1] it enables the PMDs to further optimize the data path > given the guarantees from the application. > > Not having it means possible performance degradation for some PMD > which rely on it. > > > > There is no PMD which implement it yet since not all PMDs moved to the > new offloads API. However this flag is tested and translated into txqflags as > part of rte_eth_convert_txq_offloads function. > > Relevant PMDs for this offload will be: sfc, thunderx and i40e. > > Thank you for clarification, I am OK to have it. > > But since currently no PMD provide "DEV_TX_OFFLOAD_MBUF_FAST_FREE" > capability, and default txq_flags is overwritten, some PMDs lost this > optimization until they implement new capability, right?
Yes this is correct, a good motivation to convert :). From the examples and testpmd part everything is ready. Just need for the PMD to report back the capability to have this offload.
