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https://gitlab.com/qemu-project/qemu
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b749562d98
Sufficient L2 cache can noticeably improve the performance when using large images with frequent I/O. Previously, unless 'cache-size' was specified and was large enough, the L2 cache was set to a certain size without taking the virtual image size into account. Now, the L2 cache assignment is aware of the virtual size of the image, and will cover the entire image, unless the cache size needed for that is larger than a certain maximum. This maximum is set to 1 MB by default (enough to cover an 8 GB image with the default cluster size) but can be increased or decreased using the 'l2-cache-size' option. This option was previously documented as the *maximum* L2 cache size, and this patch makes it behave as such, instead of as a constant size. Also, the existing option 'cache-size' can limit the sum of both L2 and refcount caches, as previously. Signed-off-by: Leonid Bloch <lbloch@janustech.com> Reviewed-by: Alberto Garcia <berto@igalia.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
158 lines
5.1 KiB
Bash
Executable file
158 lines
5.1 KiB
Bash
Executable file
#!/bin/bash
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#
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# Test qcow2 reopen
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#
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# Copyright (C) 2015 Red Hat, Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# creator
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owner=kwolf@redhat.com
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seq="$(basename $0)"
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echo "QA output created by $seq"
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here="$PWD"
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status=1 # failure is the default!
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_cleanup()
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{
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_cleanup_test_img
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}
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trap "_cleanup; exit \$status" 0 1 2 3 15
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# get standard environment, filters and checks
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. ./common.rc
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. ./common.filter
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. ./common.qemu
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_supported_fmt qcow2
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_supported_proto file
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_supported_os Linux
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# We are going to use lazy-refcounts
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_unsupported_imgopts 'compat=0.10'
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_make_test_img 64M
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echo === Try setting valid values for all options ===
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echo
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# Try all options and then check that all of the basic I/O operations still
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# work on this image.
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$QEMU_IO \
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-c "reopen -o lazy-refcounts=on,pass-discard-request=on" \
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-c "reopen -o lazy-refcounts=off,pass-discard-request=off" \
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-c "reopen -o pass-discard-snapshot=on,pass-discard-other=on" \
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-c "reopen -o pass-discard-snapshot=off,pass-discard-other=off" \
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-c "reopen -o overlap-check=all" \
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-c "reopen -o overlap-check=none" \
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-c "reopen -o overlap-check=cached" \
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-c "reopen -o overlap-check=constant" \
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-c "reopen -o overlap-check.template=all" \
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-c "reopen -o overlap-check.template=none" \
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-c "reopen -o overlap-check.template=cached" \
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-c "reopen -o overlap-check.template=constant" \
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-c "reopen -o overlap-check.main-header=on" \
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-c "reopen -o overlap-check.main-header=off" \
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-c "reopen -o overlap-check.active-l1=on" \
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-c "reopen -o overlap-check.active-l1=off" \
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-c "reopen -o overlap-check.active-l2=on" \
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-c "reopen -o overlap-check.active-l2=off" \
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-c "reopen -o overlap-check.refcount-table=on" \
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-c "reopen -o overlap-check.refcount-table=off" \
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-c "reopen -o overlap-check.refcount-block=on" \
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-c "reopen -o overlap-check.refcount-block=off" \
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-c "reopen -o overlap-check.snapshot-table=on" \
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-c "reopen -o overlap-check.snapshot-table=off" \
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-c "reopen -o overlap-check.inactive-l1=on" \
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-c "reopen -o overlap-check.inactive-l1=off" \
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-c "reopen -o overlap-check.inactive-l2=on" \
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-c "reopen -o overlap-check.inactive-l2=off" \
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-c "reopen -o cache-size=1M" \
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-c "reopen -o l2-cache-size=512k" \
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-c "reopen -o l2-cache-entry-size=512" \
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-c "reopen -o l2-cache-entry-size=4k" \
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-c "reopen -o l2-cache-entry-size=64k" \
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-c "reopen -o refcount-cache-size=128k" \
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-c "reopen -o cache-clean-interval=5" \
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-c "reopen -o cache-clean-interval=0" \
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-c "reopen -o cache-clean-interval=10" \
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\
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-c "write -P 55 0 32M" \
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-c "read -P 55 0 32M" \
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-c "discard 0 32M" \
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-c "write -z 0 32M" \
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-c "read -P 0 0 32M" \
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\
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"$TEST_IMG" | _filter_qemu_io
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echo
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echo === Try setting some invalid values ===
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echo
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$QEMU_IO \
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-c "reopen -o lazy-refcounts=42" \
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-c "reopen -o cache-size=1M,l2-cache-size=64k,refcount-cache-size=64k" \
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-c "reopen -o cache-size=1M,l2-cache-size=2M" \
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-c "reopen -o cache-size=1M,refcount-cache-size=2M" \
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-c "reopen -o l2-cache-entry-size=33k" \
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-c "reopen -o l2-cache-entry-size=128k" \
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-c "reopen -o refcount-cache-size=256T" \
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-c "reopen -o overlap-check=constant,overlap-check.template=all" \
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-c "reopen -o overlap-check=blubb" \
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-c "reopen -o overlap-check.template=blubb" \
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-c "reopen -o cache-clean-interval=-1" \
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"$TEST_IMG" | _filter_qemu_io
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IMGOPTS="cluster_size=256k" _make_test_img 32P
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$QEMU_IO \
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-c "reopen -o l2-cache-entry-size=512,l2-cache-size=1T" \
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"$TEST_IMG" | _filter_qemu_io
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_make_test_img 64M
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echo
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echo === Test transaction semantics ===
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echo
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# Whether lazy-refcounts was actually enabled can easily be tested: Check if
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# the dirty bit is set after a crash
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$QEMU_IO \
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-c "reopen -o lazy-refcounts=on,overlap-check=blubb" \
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-c "write -P 0x5a 0 512" \
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-c "sigraise $(kill -l KILL)" \
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"$TEST_IMG" 2>&1 | _filter_qemu_io
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# The dirty bit must not be set
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$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
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# Similarly we can test whether corruption detection has been enabled:
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# Create L1/L2, overwrite first entry in refcount block, allocate something.
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# Disabling the checks should fail, so the corruption must be detected.
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_make_test_img 64M
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$QEMU_IO -c "write 0 64k" "$TEST_IMG" | _filter_qemu_io
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poke_file "$TEST_IMG" "$((0x20000))" "\x00\x00"
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$QEMU_IO \
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-c "reopen -o overlap-check=none,lazy-refcounts=42" \
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-c "write 64k 64k" \
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"$TEST_IMG" 2>&1 | _filter_qemu_io
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# success, all done
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echo '*** done'
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rm -f $seq.full
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status=0
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