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

["Kengo NAKAHARA" <knakahara%netbsd.org@localhost>]

Module Name:    src
Committed By:   knakahara
Date:           Fri Mar  2 10:19:20 UTC 2018

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

Log Message:
ixg(4) supports workqueue poll mode, but not enabled by default yet. (that is, the default behavior is *not* changed)

At the time of high load near the wire rate, the turnaround time
of update/delete processing such as "ifconfig ixg0 inet XXX" or
"ifconfig ixg0 delete" is very long. The main reason is CPU
starvation caused by ixg(4)'s softint poll mode. ixg(4) uses
workqueue poll mode instead of softint poll mode, so that this
problem will be fix.

This change may cause performance issues, so it is not enabled
by default yet. Although there are that issues, if you want to use
workqueue poll mode, do "sysctl -w hw.ixgXX.txrx_workqueue=1" while
there is no traffic on the ixgXX.

ok by msaitoh@n.o.


To generate a diff of this commit:
cvs rdiff -u -r1.33 -r1.34 src/sys/dev/pci/ixgbe/ix_txrx.c
cvs rdiff -u -r1.127 -r1.128 src/sys/dev/pci/ixgbe/ixgbe.c
cvs rdiff -u -r1.31 -r1.32 src/sys/dev/pci/ixgbe/ixgbe.h

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