I run into 10G card performance issue. Here is my test setup, . optical cable p2p between sender and receiver machines on eth2 port. . both ends have Intel 82599 card with 4.x (4.0, 4.3.5, 4.4.6) ixgbe linux driver . host machines are 2 sockets E5 Intel server with 64G memory on board . OS is Centos 7 build 1511. . UDP multicast traffic sent from sender to receiver. Receiver has very little send traffic . Packet payload size is 1316 or 1372. No small packet.
Problem: Seeing a lot flow control packets sent from receiver end to sender, hence performance drop when bw above 7 Gbps. If flow control is tuned off, seeing a lot of rx_no_dma_resources. Note: Sender has no problem to catch up BW request. Tune has been done in Rx side are, . IRQ balance on / off . RSC queue # . Rx ring size - up to 4096 . rx_back_log size . interrupt modulation . pin worker threads on right side CPUs (same socket) I was not able to make the BW go higher than 8 Gpbs reliably (no packet drop or slow down). Any suggestion? Thanks! Hank
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