CVS commit: src/sys/dev/pci/ixgbe

["SAITOH Masanobu" <msaitoh%netbsd.org@localhost>]

Module Name:    src
Committed By:   msaitoh
Date:           Wed Jul  7 08:58:20 UTC 2021

Modified Files:
        src/sys/dev/pci/ixgbe: ix_txrx.c ixgbe.c ixgbe.h ixv.c

Log Message:
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.


To generate a diff of this commit:
cvs rdiff -u -r1.80 -r1.81 src/sys/dev/pci/ixgbe/ix_txrx.c
cvs rdiff -u -r1.285 -r1.286 src/sys/dev/pci/ixgbe/ixgbe.c
cvs rdiff -u -r1.75 -r1.76 src/sys/dev/pci/ixgbe/ixgbe.h
cvs rdiff -u -r1.162 -r1.163 src/sys/dev/pci/ixgbe/ixv.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.