I'm using Rtnet with 82583 ethernet card. It takes about 2us to send AF_PACKET using rt_dev_sendmsg(), about 200 bytes of data.
It is pretty fast, but I want to find what takes so long. At last I find that "writel(tx_ring->tail)" spend above 1us to complete. This is just MMIO write to 82583, of course MMIO is uncache. And PCIE ASPM is disabled, so L0s is not the problem. I think PCIE Memory Write TLPs is fast enough, but why spend so much time? thanks, _______________________________________________ Xenomai mailing list [email protected] http://www.xenomai.org/mailman/listinfo/xenomai
