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Alberto Garcia 52253998ec qcow2: Give the refcount cache the minimum possible size by default 
The L2 and refcount caches have default sizes that can be overridden
using the l2-cache-size and refcount-cache-size (an additional
parameter named cache-size sets the combined size of both caches).

Unless forced by one of the aforementioned parameters, QEMU will set
the unspecified sizes so that the L2 cache is 4 times larger than the
refcount cache.

This is based on the premise that the refcount metadata needs to be
only a fourth of the L2 metadata to cover the same amount of disk
space. This is incorrect for two reasons:

 a) The amount of disk covered by an L2 table depends solely on the
    cluster size, but in the case of a refcount block it depends on
    the cluster size *and* the width of each refcount entry.
    The 4/1 ratio is only valid with 16-bit entries (the default).

 b) When we talk about disk space and L2 tables we are talking about
    guest space (L2 tables map guest clusters to host clusters),
    whereas refcount blocks are used for host clusters (including
    L1/L2 tables and the refcount blocks themselves). On a fully
    populated (and uncompressed) qcow2 file, image size > virtual size
    so there are more refcount entries than L2 entries.

Problem (a) could be fixed by adjusting the algorithm to take into
account the refcount entry width. Problem (b) could be fixed by
increasing a bit the refcount cache size to account for the clusters
used for qcow2 metadata.

However this patch takes a completely different approach and instead
of keeping a ratio between both cache sizes it assigns as much as
possible to the L2 cache and the remainder to the refcount cache.

The reason is that L2 tables are used for every single I/O request
from the guest and the effect of increasing the cache is significant
and clearly measurable. Refcount blocks are however only used for
cluster allocation and internal snapshots and in practice are accessed
sequentially in most cases, so the effect of increasing the cache is
negligible (even when doing random writes from the guest).

So, make the refcount cache as small as possible unless the user
explicitly asks for a larger one.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 9695182c2eb11b77cb319689a1ebaa4e7c9d6591.1523968389.git.berto@igalia.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
 		2018-05-15 16:15:21 +02:00
..
acpi-test-data test/acpi-test-data: add ACPI tables for dimmpxm test 2018-03-20 03:34:52 +02:00
data test-qga: add test for guest-get-osinfo 2017-07-18 05:49:01 -05:00
decode scripts: Add decodetree.py 2018-02-22 15:44:07 -08:00
docker docker: fedora: test more components 2018-04-09 15:13:02 +08:00
guest-debug
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image-fuzzer
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keys tests: Add a test key pair 2017-09-22 10:46:25 +08:00
libqos qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
migration tests/migration: Add source to PC boot block 2018-02-14 10:26:21 +00:00
multiboot tests/multiboot: Add .gitignore 2018-03-21 15:13:40 +01:00
qapi-schema tests: add oob-test for qapi-schema 2018-03-27 10:17:45 -05:00
qemu-iotests qcow2: Give the refcount cache the minimum possible size by default 2018-05-15 16:15:21 +02:00
rocker tests: Avoid non-portable 'echo -ARG' 2017-07-11 17:45:00 +02:00
tcg target/xtensa: fix timers test 2018-03-26 14:17:04 -07:00
vm tests: Fix ubuntu.i386 image initialization 2018-04-09 15:13:02 +08:00
vmstate-static-checker-data
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.gitignore sockets: move fd_is_socket() into common sockets code 2018-03-13 18:06:06 +00:00
Makefile.include tests: add oob-test for qapi-schema 2018-03-27 10:17:45 -05:00
ac97-test.c
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acpi-utils.c tests: Move reusable ACPI code into a utility file 2017-03-02 07:14:27 +02:00
acpi-utils.h maint: Fix macros with broken 'do/while(0); ' usage 2018-01-16 14:54:52 +01:00
ahci-test.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
atomic_add-bench.c
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benchmark-crypto-cipher.c tests: fix incorrect size_t format in benchmark-crypto 2017-09-04 10:45:19 +01:00
benchmark-crypto-hash.c tests: fix incorrect size_t format in benchmark-crypto 2017-09-04 10:45:19 +01:00
benchmark-crypto-hmac.c tests: fix incorrect size_t format in benchmark-crypto 2017-09-04 10:45:19 +01:00
bios-tables-test.c tests/bios-tables-test: add test cases for DIMM proximity 2018-03-20 03:34:52 +02:00
boot-order-test.c libqos: Use explicit QTestState for fw_cfg operations 2018-02-14 11:43:41 +01:00
boot-sector.c tests/boot-sector: Drop dependence on global_qtest 2018-02-14 11:43:41 +01:00
boot-sector.h tests/boot-sector: Drop dependence on global_qtest 2018-02-14 11:43:41 +01:00
boot-serial-test.c hw/s390x: Allow to configure the consoles with the "-serial" parameter 2018-04-30 10:48:29 +02:00
check-block.sh
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check-qdict.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
check-qjson.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
check-qlist.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
check-qlit.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
check-qnull.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
check-qnum.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
check-qobject.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
check-qom-interface.c
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check-qom-proplist.c qapi: drop the sentinel in enum array 2017-09-04 13:09:13 +02:00
check-qstring.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
cpu-plug-test.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
crypto-tls-x509-helpers.c crypto: fix test cert generation to not use SHA1 algorithm 2017-09-04 10:45:19 +01:00
crypto-tls-x509-helpers.h
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device-introspect-test.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
display-vga-test.c
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drive_del-test.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
ds1338-test.c libqos: Use explicit QTestState for i2c operations 2018-02-14 11:43:41 +01:00
e1000-test.c tests: fix e1000-test leak 2017-03-01 11:51:28 +04:00
e1000e-test.c libqos: Use explicit QTestState for fw_cfg operations 2018-02-14 11:43:41 +01:00
eepro100-test.c tests: fix eepro100-test leak 2017-03-01 11:51:05 +04:00
endianness-test.c libqtest: Add qtest_[v]startf() 2017-10-20 13:32:10 +02:00
es1370-test.c
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fdc-test.c fdc-test: Avoid deprecated 'change' command 2017-05-09 09:14:40 +02:00
fw_cfg-test.c libqos: Use explicit QTestState for fw_cfg operations 2018-02-14 11:43:41 +01:00
hd-geo-test.c tests: fix hd-geo-test leaks 2017-03-01 11:51:04 +04:00
i440fx-test.c libqos: Track QTestState with QPCIBus 2018-02-14 11:43:02 +01:00
i82801b11-test.c
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ide-test.c libqos: Use explicit QTestState for fw_cfg operations 2018-02-14 11:43:41 +01:00
intel-hda-test.c
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io-channel-helpers.c Include qapi/error.h exactly where needed 2018-02-09 13:50:17 +01:00
io-channel-helpers.h
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ioh3420-test.c
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iothread.c
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iothread.h
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ipmi-bt-test.c libqtest: Add qtest_[v]startf() 2017-10-20 13:32:10 +02:00
ipmi-kcs-test.c tests: fix ipmi-kcs-test leak 2017-03-01 11:51:05 +04:00
ipoctal232-test.c
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ivshmem-test.c libqos: Use explicit QTestState for remaining libqos operations 2018-02-14 11:43:41 +01:00
libqtest.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
libqtest.h tests: Add parameter to qtest_init_without_qmp_handshake 2018-03-27 10:17:45 -05:00
m25p80-test.c libqtest: Add qtest_[v]startf() 2017-10-20 13:32:10 +02:00
m48t59-test.c tests/m48t59: Use the m48t59 test on ppc, too 2018-02-14 11:43:42 +01:00
machine-none-test.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
megasas-test.c libqos: Use explicit QTestState for remaining libqos operations 2018-02-14 11:43:41 +01:00
migration-test.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
ne2000-test.c
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numa-test.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
nvme-test.c tests: Use null-co:// instead of /dev/null as the dummy image 2017-05-11 11:08:40 +02:00
pcnet-test.c
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pkix_asn1_tab.c
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pnv-xscom-test.c ppc/pnv: fix XSCOM core addressing on POWER9 2018-01-17 09:35:24 +11:00
prom-env-test.c libqtest: Add qtest_[v]startf() 2017-10-20 13:32:10 +02:00
ptimer-test-stubs.c ptimer-test: do not link to libqemustub.a/libqemuutil.a 2017-09-19 16:19:39 +02:00
ptimer-test.c Clean up includes 2018-02-09 05:05:11 +01:00
ptimer-test.h
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pvpanic-test.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
pxe-test.c tests/boot-sector: Drop dependence on global_qtest 2018-02-14 11:43:41 +01:00
q35-test.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
qemu-iotests-quick.sh
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qht-bench.c tcg: define CF_PARALLEL and use it for TB hashing along with CF_COUNT_MASK 2017-10-24 13:53:41 -07:00
qmp-test.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
qom-test.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
rcutorture.c rcutorture: remove synchronize_rcu from readers 2018-03-12 16:12:47 +01:00
rtas-test.c libqos: Use explicit QTestState for remaining libqos operations 2018-02-14 11:43:41 +01:00
rtc-test.c rtc-test: introduce more update tests 2017-08-01 17:27:33 +02:00
rtl8139-test.c libqos: Track QTestState with QPCIBus 2018-02-14 11:43:02 +01:00
sdhci-test.c sdhci-test: fix leaks 2018-03-06 14:01:27 +01:00
socket-helpers.c sockets: strengthen test suite IP protocol availability checks 2018-03-13 18:06:06 +00:00
socket-helpers.h sockets: strengthen test suite IP protocol availability checks 2018-03-13 18:06:06 +00:00
spapr-phb-test.c
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tco-test.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
test-aio-multithread.c Include qapi/error.h exactly where needed 2018-02-09 13:50:17 +01:00
test-aio.c coroutine: add test-aio coroutine queue chaining test case 2018-03-27 13:05:28 +01:00
test-arm-mptimer.c
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test-base64.c
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test-bdrv-drain.c blockjobs: add block_job_verb permission table 2018-03-19 12:01:24 +01:00
test-bitcnt.c
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test-bitops.c
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test-block-backend.c block: test blk_aio_flush() with blk->root == NULL 2018-03-02 18:39:07 +01:00
test-blockjob-txn.c block/mirror: change the semantic of 'force' of block-job-cancel 2018-03-19 12:01:39 +01:00
test-blockjob.c tests/test-blockjob: test cancellations 2018-03-19 12:01:24 +01:00
test-bufferiszero.c
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test-char.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
test-clone-visitor.c Eliminate qapi/qmp/types.h 2018-02-09 13:52:15 +01:00
test-coroutine.c lockable: add QemuLockable 2018-02-08 09:22:03 +08:00
test-crypto-afsplit.c
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test-crypto-block.c tests: Run the luks tests in test-crypto-block only if encryption is available 2017-11-08 11:03:46 +00:00
test-crypto-cipher.c
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test-crypto-hash.c
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test-crypto-hmac.c
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test-crypto-ivgen.c
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test-crypto-pbkdf.c
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test-crypto-secret.c
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test-crypto-tlscredsx509.c
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test-crypto-tlssession.c crypto: ensure we use a predictable TLS priority setting 2018-04-06 11:28:31 +01:00
test-crypto-xts.c
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test-cutils.c cutils: add qemu_strtoi & qemu_strtoui parsers for int/unsigned int types 2018-03-13 18:06:05 +00:00
test-filter-mirror.c libqtest: Add qtest_[v]startf() 2017-10-20 13:32:10 +02:00
test-filter-redirector.c tests/test-filter-redirector: move close() 2018-02-07 14:09:25 +01:00
test-hbitmap.c tests/hbitmap: use ARRAY_SIZE macro 2018-02-10 10:44:30 +03:00
test-hmp.c net: Remove the deprecated 'host_net_add' and 'host_net_remove' HMP commands 2018-03-05 10:30:15 +08:00
test-int128.c
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test-io-channel-buffer.c
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test-io-channel-command.c tests: fix leaks in test-io-channel-command 2017-03-01 00:09:28 +04:00
test-io-channel-file.c io: Fix QIOChannelFile when creating and opening read-write 2018-02-15 16:54:57 +00:00
test-io-channel-socket.c sockets: pull code for testing IP availability out of specific test 2018-03-13 18:06:06 +00:00
test-io-channel-tls.c crypto: ensure we use a predictable TLS priority setting 2018-04-06 11:28:31 +01:00
test-io-task.c qio: non-default context for threaded qtask 2018-03-06 10:19:05 +00:00
test-iov.c tests: Use real size for iov tests 2017-09-05 22:34:40 +02:00
test-keyval.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
test-logging.c
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test-mul64.c
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test-netfilter.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
test-opts-visitor.c qapi: Fix QemuOpts visitor regression on unvisited input 2017-03-22 19:24:34 +01:00
test-qapi-util.c Drop superfluous includes of qapi-types.h and test-qapi-types.h 2018-02-09 05:05:11 +01:00
test-qdev-global-props.c test-qdev-global-props: Test global property ordering 2017-07-17 15:41:30 -03:00
test-qdist.c
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test-qemu-opts.c opts: don't silently truncate long parameter keys 2018-05-09 00:13:39 +02:00
test-qga.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
test-qht-par.c
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test-qht.c
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test-qmp-cmds.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
test-qmp-event.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
test-qobject-input-visitor.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
test-qobject-output-visitor.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
test-rcu-list.c
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test-replication.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
test-shift128.c
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test-string-input-visitor.c Eliminate qapi/qmp/types.h 2018-02-09 13:52:15 +01:00
test-string-output-visitor.c tests/qapi: use ARRAY_SIZE macro 2018-02-10 10:45:14 +03:00
test-thread-pool.c
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test-throttle.c block: convert ThrottleGroup to object with QOM 2017-09-05 18:12:21 +02:00
test-timed-average.c
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test-util-sockets.c sockets: allow SocketAddress 'fd' to reference numeric file descriptors 2018-03-13 18:06:06 +00:00
test-uuid.c util: add is_equal to UUID API 2017-12-20 22:01:24 +08:00
test-visitor-serialization.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
test-vmstate.c migration: Route more error paths 2017-09-27 11:44:18 +01:00
test-write-threshold.c
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test-x86-cpuid-compat.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
test-x86-cpuid.c
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test-xbzrle.c migration: Create migration/xbzrle.h 2017-05-18 18:04:54 +02:00
tmp105-test.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
tpci200-test.c
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tpm-crb-test.c tests: Tests more flags of the CRB interface 2018-03-29 17:41:03 -04:00
tpm-emu.c tests: add test for TPM TIS device 2018-02-21 07:24:50 -05:00
tpm-emu.h tests: Move common TPM test code into tpm-emu.c 2018-02-21 07:24:50 -05:00
tpm-tis-test.c tests: add test for TPM TIS device 2018-02-21 07:24:50 -05:00
usb-hcd-ehci-test.c libqos: Track QTestState with QPCIBus 2018-02-14 11:43:02 +01:00
usb-hcd-ohci-test.c
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usb-hcd-uhci-test.c libqos: Use explicit QTestState for remaining libqos operations 2018-02-14 11:43:41 +01:00
usb-hcd-xhci-test.c tests: Introduce generic device hot-plug/hot-unplug functions 2017-09-15 09:05:18 +02:00
vhost-user-bridge.c tests: Avoid 'do/while(false); ' in vhost-user-bridge 2018-01-16 14:54:52 +01:00
vhost-user-test.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
virtio-9p-test.c libqos: Use explicit QTestState for remaining libqos operations 2018-02-14 11:43:41 +01:00
virtio-balloon-test.c tests: Enable the very simple virtio tests on s390x, too 2017-10-20 13:32:10 +02:00
virtio-blk-test.c libqos: Use explicit QTestState for remaining libqos operations 2018-02-14 11:43:41 +01:00
virtio-console-test.c tests: Enable the very simple virtio tests on s390x, too 2017-10-20 13:32:10 +02:00
virtio-net-test.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
virtio-rng-test.c
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virtio-scsi-test.c scsi: support NDOB (no data-out buffer) for WRITE SAME commands 2018-03-12 16:12:46 +01:00
virtio-serial-test.c tests: Enable the very simple virtio tests on s390x, too 2017-10-20 13:32:10 +02:00
vmgenid-test.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
vmxnet3-test.c
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wdt_ib700-test.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00