97 lines
2.8 KiB
Bash
Executable File
97 lines
2.8 KiB
Bash
Executable File
#!/bin/ksh -p
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#
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# CDDL HEADER START
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#
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# This file and its contents are supplied under the terms of the
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# Common Development and Distribution License ("CDDL"), version 1.0.
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# You may only use this file in accordance with the terms of version
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# 1.0 of the CDDL.
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#
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# A full copy of the text of the CDDL should have accompanied this
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# source. A copy of the CDDL is also available via the Internet at
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# http://www.illumos.org/license/CDDL.
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#
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# CDDL HEADER END
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#
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#
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# Copyright (c) 2020, George Amanakis. All rights reserved.
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#
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. $STF_SUITE/include/libtest.shlib
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. $STF_SUITE/tests/functional/l2arc/l2arc.cfg
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#
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# DESCRIPTION:
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# l2arc_mfuonly does not cache MRU buffers
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#
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# STRATEGY:
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# 1. Set l2arc_mfuonly=yes
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# 2. Create pool with a cache device.
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# 3. Create a random file in that pool, smaller than the cache device
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# and random read for 10 sec.
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# 4. Export and re-import the pool. This is necessary as some MFU ghost
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# buffers with prefetch status may transition to MRU eventually.
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# By re-importing the pool the l2 arcstats reflect the ARC state
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# of L2ARC buffers upon their caching in L2ARC.
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# 5. Verify l2arc_mru_asize is 0.
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#
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verify_runnable "global"
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command -v fio > /dev/null || log_unsupported "fio missing"
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log_assert "l2arc_mfuonly does not cache MRU buffers."
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function cleanup
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{
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if poolexists $TESTPOOL ; then
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destroy_pool $TESTPOOL
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fi
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log_must set_tunable32 L2ARC_NOPREFETCH $noprefetch
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log_must set_tunable32 L2ARC_MFUONLY $mfuonly
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log_must set_tunable32 PREFETCH_DISABLE $zfsprefetch
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}
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log_onexit cleanup
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# L2ARC_NOPREFETCH is set to 1 as some prefetched buffers may
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# transition to MRU.
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typeset noprefetch=$(get_tunable L2ARC_NOPREFETCH)
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log_must set_tunable32 L2ARC_NOPREFETCH 1
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typeset mfuonly=$(get_tunable L2ARC_MFUONLY)
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log_must set_tunable32 L2ARC_MFUONLY 1
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typeset zfsprefetch=$(get_tunable PREFETCH_DISABLE)
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log_must set_tunable32 PREFETCH_DISABLE 1
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typeset fill_mb=800
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typeset cache_sz=$(( 1.4 * $fill_mb ))
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export FILE_SIZE=$(( floor($fill_mb / $NUMJOBS) ))M
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log_must truncate -s ${cache_sz}M $VDEV_CACHE
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typeset log_blk_start=$(get_arcstat l2_log_blk_writes)
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log_must zpool create -f $TESTPOOL $VDEV cache $VDEV_CACHE
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log_must fio $FIO_SCRIPTS/mkfiles.fio
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log_must fio $FIO_SCRIPTS/random_reads.fio
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log_must zpool export $TESTPOOL
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log_must zpool import -N -d $VDIR $TESTPOOL
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# Regardless of l2arc_noprefetch, some MFU buffers might be evicted
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# from ARC, accessed later on as prefetches and transition to MRU as
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# prefetches.
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# If accessed again they are counted as MRU and the l2arc_mru_asize arcstat
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# will not be 0 (mentioned also in zfs.4)
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# For the purposes of this test we mitigate this by disabling (predictive)
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# ZFS prefetches with zfs_prefetch_disable=1.
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log_must test $(get_arcstat l2_mru_asize) -eq 0
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log_must zpool destroy -f $TESTPOOL
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log_pass "l2arc_mfuonly does not cache MRU buffers."
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