FreeBSD/scripts/mbuf.sh

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2021-04-01 01:23:14 -07:00
#!/bin/sh
# Copyright (c) 2018-2021, diyIT.org
# All rights reserved.
#
# BSD 2-Clause License ("Simplified BSD License" or "FreeBSD License")
# https://diyit.org/license/
#
#
MCLBYTES=2048
MSIZE=256
PHYSMEM=`sysctl -n hw.physmem`
PAGE_SIZE=`sysctl -n hw.pagesize`
VM_KMEM_SIZE=`sysctl -n vm.kmem_size`
REALMEM=${VM_KMEM_SIZE}
MAXMBUFMEM=`expr $REALMEM / 4 \* 3`
MJUMPAGESIZE=$PAGE_SIZE
MJUM9BYTES=`expr 9 \* 1024`
MJUM16BYTES=`expr 16 \* 1024`
#NMBCLUSTERS=`expr $MAXMBUFMEM / $MCLBYTES / 4` # higher # of jails
NMBCLUSTERS=`expr $MAXMBUFMEM / $MCLBYTES / 3`
NMBJUMBOP=`expr $MAXMBUFMEM / $MJUMPAGESIZE / 4`
NMBJUMBO9=`expr $MAXMBUFMEM / $MJUM9BYTES / 6`
NMBJUMBO16=`expr $MAXMBUFMEM / $MJUM16BYTES / 6`
NMBUFS=`sysctl -n kern.ipc.nmbufs`
NMMAX1=`expr $NMBCLUSTERS + $NMBJUMBOP + $NMBJUMBO9 + $NMBJUMBO16`
NMMAX2=`expr $MAXMBUFMEM / $MSIZE / 5`
if [ $NMMAX1 -gt $NMMAX2 ]; then
NMBUFS=$NMMAX1
else
NMBUFS=$NMMAX2
fi
show()
{
echo "# `basename $0 ` suggested settings:"
echo "kern.ipc.maxmbufmem=$MAXMBUFMEM"
echo "kern.ipc.nmbclusters=$NMBCLUSTERS"
echo "kern.ipc.nmbjumbop=$NMBJUMBOP"
echo "kern.ipc.nmbjumbo9=$NMBJUMBO9"
echo "kern.ipc.nmbjumbo16=$NMBJUMBO16"
echo "kern.ipc.nmbufs=$NMBUFS"
}
compare()
{
echo "kern.ipc.maxmbufmem: `sysctl -n kern.ipc.maxmbufmem` (current)"
echo " --> $MAXMBUFMEM (suggested)"
echo "kern.ipc.nmbclusters: `sysctl -n kern.ipc.nmbclusters`"
echo " --> $NMBCLUSTERS"
echo "kern.ipc.nmbjumbop: `sysctl -n kern.ipc.nmbjumbop`"
echo " --> $NMBJUMBOP"
echo "kern.ipc.nmbjumbo9: `sysctl -n kern.ipc.nmbjumbo9`"
echo " --> $NMBJUMBO9"
echo "kern.ipc.nmbjumbo16: `sysctl -n kern.ipc.nmbjumbo16`"
echo " --> $NMBJUMBO16"
echo "kern.ipc.nmbufs: `sysctl -n kern.ipc.nmbufs`"
echo " --> $NMBUFS"
vmstat -z|grep -E '^ITEM|mbuf'
netstat -m
# vmstat -m
}
if [ $# -gt 0 ]; then
if [ $1 == '-c' ]; then
compare
exit 0
fi
fi
show