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| /freebsd-10.1-release/sys/dev/e1000/ | ||
| H A D | if_igb.h | diff 220375 Tue Apr 05 20:01:16 MDT 2011 jfv Important update for the igb driver: - Add the change made in em to the actual unrefreshed number of descriptors is used as a basis in rxeof on the way out to determine if more refresh is needed. NOTE: there is a difference in the ring setup in igb, this is not accidental, it is necessitated by hardware behavior, when you reset the newer adapters it will not let you write RDH, it ALWAYS sets it to 0. Thus the way em does it is not possible. - Change the sysctl handling of flow control, it will now make the change dynamically when the variable setting changes rather than requiring a reset. - Change the eee sysctl naming, validation found the old unintuitive :) - Last but not least, some important performance tweaks in the TX path, I found that UDP behavior could be drastically hindered or improved with just small changes in the start loop. What I have here is what testing has shown to be the best overall. Its interesting to note that changing the clean threshold to start at a full half of the ring, made a BIG difference in performance. I hope that this will prove to be advantageous for most workloads. MFC in a week. |
| H A D | if_igb.c | diff 220375 Tue Apr 05 20:01:16 MDT 2011 jfv Important update for the igb driver: - Add the change made in em to the actual unrefreshed number of descriptors is used as a basis in rxeof on the way out to determine if more refresh is needed. NOTE: there is a difference in the ring setup in igb, this is not accidental, it is necessitated by hardware behavior, when you reset the newer adapters it will not let you write RDH, it ALWAYS sets it to 0. Thus the way em does it is not possible. - Change the sysctl handling of flow control, it will now make the change dynamically when the variable setting changes rather than requiring a reset. - Change the eee sysctl naming, validation found the old unintuitive :) - Last but not least, some important performance tweaks in the TX path, I found that UDP behavior could be drastically hindered or improved with just small changes in the start loop. What I have here is what testing has shown to be the best overall. Its interesting to note that changing the clean threshold to start at a full half of the ring, made a BIG difference in performance. I hope that this will prove to be advantageous for most workloads. MFC in a week. |
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