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authormsaitoh <msaitoh@NetBSD.org>2021-07-07 08:58:19 +0000
committermsaitoh <msaitoh@NetBSD.org>2021-07-07 08:58:19 +0000
commitb6b5e90cb8de0d7e820a4e37368f9cc3e4dd54b0 (patch)
tree108bf863d738601d4abb2a66366ad6b85b63a8fb /sbin/dump
parentd7c9e19c460b9687491ade881624bfeaa4af0bb1 (diff)
Add new sysctl "rx_copy_len".
ixgbe_rxeof() has an optimization "RX_COPY" to reduce costs of bus_dmamap_load_mbuf() and bus_dmamap_unload() by copying a mbuf cluster's memory to a newly allocated mbuf's MH_databuf[] and recycle the original map. The optimization is used when a length of a packet is smaller than a specific value. The value is calculated based on MHLEN. The size of MHLEN is architecture specific. It's 256 or 512. Make the threshold controllable by adding a new sysctl.
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