1*9e3493cbSJason King#!/bin/ksh -p 2*9e3493cbSJason King# 3*9e3493cbSJason King# CDDL HEADER START 4*9e3493cbSJason King# 5*9e3493cbSJason King# This file and its contents are supplied under the terms of the 6*9e3493cbSJason King# Common Development and Distribution License ("CDDL"), version 1.0. 7*9e3493cbSJason King# You may only use this file in accordance with the terms of version 8*9e3493cbSJason King# 1.0 of the CDDL. 9*9e3493cbSJason King# 10*9e3493cbSJason King# A full copy of the text of the CDDL should have accompanied this 11*9e3493cbSJason King# source. A copy of the CDDL is also available via the Internet at 12*9e3493cbSJason King# http://www.illumos.org/license/CDDL. 13*9e3493cbSJason King# 14*9e3493cbSJason King# CDDL HEADER END 15*9e3493cbSJason King# 16*9e3493cbSJason King 17*9e3493cbSJason King# 18*9e3493cbSJason King# Copyright (c) 2020, George Amanakis. All rights reserved. 19*9e3493cbSJason King# 20*9e3493cbSJason King 21*9e3493cbSJason King. $STF_SUITE/include/libtest.shlib 22*9e3493cbSJason King. $STF_SUITE/tests/functional/l2arc/l2arc.cfg 23*9e3493cbSJason King 24*9e3493cbSJason King# 25*9e3493cbSJason King# DESCRIPTION: 26*9e3493cbSJason King# l2arc_mfuonly does not cache MRU buffers 27*9e3493cbSJason King# 28*9e3493cbSJason King# STRATEGY: 29*9e3493cbSJason King# 1. Set l2arc_mfuonly=yes 30*9e3493cbSJason King# 2. Create pool with a cache device. 31*9e3493cbSJason King# 3. Create a random file in that pool, smaller than the cache device 32*9e3493cbSJason King# and random read for 10 sec. 33*9e3493cbSJason King# 4. Export and re-import the pool. This is necessary as some MFU ghost 34*9e3493cbSJason King# buffers with prefetch status may transition to MRU eventually. 35*9e3493cbSJason King# By re-importing the pool the l2 arcstats reflect the ARC state 36*9e3493cbSJason King# of L2ARC buffers upon their caching in L2ARC. 37*9e3493cbSJason King# 5. Verify l2arc_mru_asize is 0. 38*9e3493cbSJason King# 39*9e3493cbSJason King 40*9e3493cbSJason Kingverify_runnable "global" 41*9e3493cbSJason King 42*9e3493cbSJason Kinglog_assert "l2arc_mfuonly does not cache MRU buffers." 43*9e3493cbSJason King 44*9e3493cbSJason Kingfunction cleanup 45*9e3493cbSJason King{ 46*9e3493cbSJason King if poolexists $TESTPOOL ; then 47*9e3493cbSJason King destroy_pool $TESTPOOL 48*9e3493cbSJason King fi 49*9e3493cbSJason King 50*9e3493cbSJason King log_must set_tunable32 l2arc_noprefetch $noprefetch 51*9e3493cbSJason King log_must set_tunable32 l2arc_mfuonly $mfuonly 52*9e3493cbSJason King log_must set_tunable32 zfs_prefetch_disable $zfsprefetch 53*9e3493cbSJason King} 54*9e3493cbSJason Kinglog_onexit cleanup 55*9e3493cbSJason King 56*9e3493cbSJason King# l2arc_noprefetch is set to 1 as some prefetched buffers may 57*9e3493cbSJason King# transition to MRU. 58*9e3493cbSJason Kingtypeset noprefetch=$(get_tunable l2arc_noprefetch) 59*9e3493cbSJason Kinglog_must set_tunable32 l2arc_noprefetch 1 60*9e3493cbSJason King 61*9e3493cbSJason Kingtypeset mfuonly=$(get_tunable l2arc_mfuonly) 62*9e3493cbSJason Kinglog_must set_tunable32 l2arc_mfuonly 1 63*9e3493cbSJason King 64*9e3493cbSJason Kingtypeset zfsprefetch=$(get_tunable zfs_prefetch_disable) 65*9e3493cbSJason Kinglog_must set_tunable32 zfs_prefetch_disable 1 66*9e3493cbSJason King 67*9e3493cbSJason Kingtypeset fill_mb=800 68*9e3493cbSJason Kingtypeset cache_sz=$(( 1.4 * $fill_mb )) 69*9e3493cbSJason Kingexport FILE_SIZE=$(( floor($fill_mb / $NUMJOBS) ))M 70*9e3493cbSJason King 71*9e3493cbSJason Kinglog_must truncate -s ${cache_sz}M $VDEV_CACHE 72*9e3493cbSJason King 73*9e3493cbSJason Kingtypeset log_blk_start=$(get_arcstat l2_log_blk_writes) 74*9e3493cbSJason King 75*9e3493cbSJason Kinglog_must zpool create -f $TESTPOOL $VDEV cache $VDEV_CACHE 76*9e3493cbSJason King 77*9e3493cbSJason Kinglog_must fio $FIO_SCRIPTS/mkfiles.fio 78*9e3493cbSJason Kinglog_must fio $FIO_SCRIPTS/random_reads.fio 79*9e3493cbSJason King 80*9e3493cbSJason Kinglog_must zpool export $TESTPOOL 81*9e3493cbSJason Kinglog_must zpool import -d $VDIR $TESTPOOL 82*9e3493cbSJason King 83*9e3493cbSJason King# Regardless of l2arc_noprefetch, some MFU buffers might be evicted 84*9e3493cbSJason King# from ARC, accessed later on as prefetches and transition to MRU as 85*9e3493cbSJason King# prefetches. 86*9e3493cbSJason King# If accessed again they are counted as MRU and the l2arc_mru_asize arcstat 87*9e3493cbSJason King# will not be 0 (mentioned also in zfs-module-parameters.5) 88*9e3493cbSJason King# For the purposes of this test we mitigate this by disabling (predictive) 89*9e3493cbSJason King# ZFS prefetches with zfs_prefetch_disable=1. 90*9e3493cbSJason Kinglog_must test $(get_arcstat l2_mru_asize) -eq 0 91*9e3493cbSJason King 92*9e3493cbSJason Kinglog_must zpool destroy -f $TESTPOOL 93*9e3493cbSJason King 94*9e3493cbSJason Kinglog_pass "l2arc_mfuonly does not cache MRU buffers." 95