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Alberto Garcia 7f65ce834a docs: document how to configure the qcow2 L2/refcount caches 
QEMU has options to configure the size of the L2 and refcount
caches for the qcow2 format. However, choosing the right sizes for
a particular disk image is not a straightforward operation since
the ratio between the cache size and the allocated disk space is
not obvious and depends on the size of the cluster and the refcount
entries.

This document attempts to give an overview of both caches and how to
configure their sizes.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 55de928e139b1ba3f3d40fe9c6c88f30b1f36410.1438690126.git.berto@igalia.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
2015-09-04 21:00:32 +02:00
audio
ossaudio: fix memory leak
2015-07-08 13:11:01 +02:00
backends
hostmem: Fix qemu_opt_get_bool() crash in host_memory_backend_init()
2015-07-22 15:09:25 -03:00
block
qcow2: add option to clean unused cache entries after some time
2015-09-04 21:00:32 +02:00
bsd-user
linux-user: remove --enable-guest-base/--disable-guest-base
2015-08-24 11:14:17 -07:00
crypto
crypto: fix built-in AES decrypt function
2015-07-27 12:22:01 +02:00
default-configs
smbios: move smbios code into a common folder
2015-08-13 14:08:30 +03:00
disas
disas/arm-a64: Add missing compiler attribute GCC_FMT_ATTR
2015-07-21 11:18:45 +01:00
docs
docs: document how to configure the qcow2 L2/refcount caches
2015-09-04 21:00:32 +02:00
dtc @ 65cc4d2748
dtc: Update dtc / libfdt submodule to version 1.4.0
2015-06-03 23:56:49 +02:00
fpu
target-s390x: define default NaN values
2015-06-05 01:37:58 +02:00
fsdev
virtfs-proxy-helper: fail gracefully if socket path is too long
2015-06-16 20:32:29 +05:30
gdb-xml
gdb-xml: Include XML for s390 vector registers
2015-05-27 17:52:03 +02:00
hw
Merge remote-tracking branch 'remotes/cohuck/tags/s390x-20150903' into staging
2015-09-03 14:33:03 +01:00
include
Merge remote-tracking branch 'remotes/cohuck/tags/s390x-20150903' into staging
2015-09-03 14:33:03 +01:00
libcacard
libcacard: pkgconfig: tidy dependent libs
2015-06-23 19:57:28 +03:00
libdecnumber
remove libdecnumber/dpd/decimal128Local.h
2015-06-23 19:57:27 +03:00
linux-headers
linux-headers: Update to 4.2-rc1
2015-07-06 17:59:01 +02:00
linux-user
linux-user: remove useless macros GUEST_BASE and RESERVED_VA
2015-08-24 11:14:30 -07:00
migration
migration: Fix global state with Xen.
2015-08-03 16:13:23 +00:00
net
net: Flush queued packets when guest resumes
2015-07-20 18:11:24 +01:00
pc-bios
pseries: Update SLOF firmware image to qemu-slof-20150429
2015-07-07 17:44:49 +02:00
pixman @ 87eea99e44
pixman: update internal copy to pixman-0.32.6
2014-09-15 08:14:19 +02:00
po
po: fix conflict with %.mo rule in rules.mak
2014-09-26 13:35:08 +02:00
qapi
qcow2: add option to clean unused cache entries after some time
2015-09-04 21:00:32 +02:00
qga
qemu-ga: implement win32 guest-set-user-password
2015-09-01 13:16:26 -05:00
qobject
Include qapi/qmp/qerror.h exactly where needed
2015-06-22 18:20:41 +02:00
qom
exec: drop cpu_can_do_io, just read cpu->can_do_io
2015-08-14 23:40:32 +02:00
roms
pseries: Update SLOF firmware image to qemu-slof-20150429
2015-07-07 17:44:49 +02:00
scripts
Merge remote-tracking branch 'remotes/armbru/tags/pull-monitor-2015-09-04' into staging
2015-09-04 17:37:50 +01:00
slirp
qerror: Move #include out of qerror.h
2015-06-22 18:20:40 +02:00
stubs
main-loop: introduce qemu_mutex_iothread_locked
2015-07-01 15:45:50 +02:00
target-alpha
Merge remote-tracking branch 'remotes/rth/tags/pull-axp-20150902' into staging
2015-09-03 12:09:41 +01:00
target-arm
target-arm: Implement AArch64 TLBI operations on IPAs
2015-08-25 16:18:33 +01:00
target-cris
tcg: Remove tcg_gen_trunc_i64_i32
2015-08-24 11:10:54 -07:00
target-i386
target-i386: Remove x86_cpu_compat_set_features()
2015-08-13 14:08:25 +03:00
target-lm32
cpu-exec: Purge all uses of ENV_GET_CPU()
2015-07-09 15:20:40 +02:00
target-m68k
tcg: Remove tcg_gen_trunc_i64_i32
2015-08-24 11:10:54 -07:00
target-microblaze
tcg: Remove tcg_gen_trunc_i64_i32
2015-08-24 11:10:54 -07:00
target-mips
tcg: Remove tcg_gen_trunc_i64_i32
2015-08-24 11:10:54 -07:00
target-moxie
cpu-exec: Purge all uses of ENV_GET_CPU()
2015-07-09 15:20:40 +02:00
target-openrisc
tcg: Remove tcg_gen_trunc_i64_i32
2015-08-24 11:10:54 -07:00
target-ppc
cpu-exec: Purge all uses of ENV_GET_CPU()
2015-07-09 15:20:40 +02:00
target-s390x
s390x: Enable new s390-storage-keys device
2015-09-03 12:17:54 +02:00
target-sh4
tcg: Remove tcg_gen_trunc_i64_i32
2015-08-24 11:10:54 -07:00
target-sparc
tcg: Remove tcg_gen_trunc_i64_i32
2015-08-24 11:10:54 -07:00
target-tricore
tcg: Remove tcg_gen_trunc_i64_i32
2015-08-24 11:10:54 -07:00
target-unicore32
cpu-exec: Purge all uses of ENV_GET_CPU()
2015-07-09 15:20:40 +02:00
target-xtensa
tcg: Remove tcg_gen_trunc_i64_i32
2015-08-24 11:10:54 -07:00
tcg
tcg/i386: omit a few REXW prefixes in softmmu code
2015-09-02 14:24:10 -07:00
tests
iotests: Warn if python subprocess is killed
2015-09-04 20:59:48 +02:00
trace
Remove superfluous '\n' around error_report()
2015-03-10 08:15:33 +03:00
ui
vnc: fix memory corruption (CVE-2015-5225)
2015-08-26 17:54:33 +02:00
util
qemu-iotests: s390x: fix test 049, reject negative sizes in QemuOpts
2015-09-04 20:59:48 +02:00
.exrc
…
.gitignore
qemu-ga: Add .msi files to .gitignore
2015-09-01 11:07:08 -05:00
.gitmodules
PPC: Add u-boot firmware for e500
2014-06-16 13:24:35 +02:00
.mailmap
Update mailmap
2013-09-05 09:40:31 -05:00
.travis.yml
.travis.yml: Add "--enable-modules"
2015-01-26 12:27:05 +01:00
accel.c
accel: Create accel object when initializing machine
2014-10-09 15:36:14 +02:00
aio-posix.c
AioContext: optimize clearing the EventNotifier
2015-07-22 12:41:40 +01:00
aio-win32.c
AioContext: optimize clearing the EventNotifier
2015-07-22 12:41:40 +01:00
arch_init.c
smbios: move smbios code into a common folder
2015-08-13 14:08:30 +03:00
async.c
AioContext: force event loop iteration using BH
2015-07-29 10:02:06 +01:00
balloon.c
Include monitor/monitor.h exactly where needed
2015-06-22 18:20:41 +02:00
block.c
block: more check for replaced node
2015-09-02 14:56:39 +01:00
blockdev-nbd.c
Include monitor/monitor.h exactly where needed
2015-06-22 18:20:41 +02:00
blockdev.c
block: more check for replaced node
2015-09-02 14:56:39 +01:00
blockjob.c
blockjob: add block_job_release function
2015-07-07 14:27:14 +01:00
bootdevice.c
misc: fix typos in copyright declaration
2015-03-26 14:21:43 +01:00
bt-host.c
…
bt-vhci.c
…
Changelog
Use qemu-project.org domain name
2013-10-11 09:34:56 -07:00
CODING_STYLE
CODING_STYLE: Section about conditional statement
2014-08-15 18:54:06 +04:00
configure
build: qemu-ga: fix VSS dependencies
2015-09-01 13:16:26 -05:00
COPYING
…
COPYING.LIB
…
coroutine-gthread.c
glib-compat.h: add new thread API emulation on top of pre-2.31 API
2014-06-10 07:44:01 +02:00
coroutine-sigaltstack.c
coroutine-sigaltstack: Change jmp_buf to sigjmp_buf
2014-11-11 11:07:55 +03:00
coroutine-ucontext.c
coroutine-ucontext: use __thread
2015-01-13 13:43:28 +00:00
coroutine-win32.c
coroutine-win32.c: Add noinline attribute to work around gcc bug
2014-06-26 14:08:14 +01:00
cpu-exec.c
exec: drop cpu_can_do_io, just read cpu->can_do_io
2015-08-14 23:40:32 +02:00
cpus.c
exec: drop cpu_can_do_io, just read cpu->can_do_io
2015-08-14 23:40:32 +02:00
cputlb.c
cputlb: Add functions for flushing TLB for a single MMU index
2015-08-25 16:18:33 +01:00
device_tree.c
device_tree: Fix a typo
2015-07-27 22:44:47 +03:00
device-hotplug.c
pci-hotplug-old: Has been dead for five major releases, bury
2015-03-01 12:37:54 +01:00
disas.c
disas: Defeature print_target_address
2015-08-14 23:40:32 +02:00
dma-helpers.c
range: remove useless inclusions
2015-04-30 16:05:48 +03:00
dump.c
Include qapi/qmp/qerror.h exactly where needed
2015-06-22 18:20:41 +02:00
exec.c
exec: use macro ROUND_UP for alignment
2015-08-14 23:40:32 +02:00
gdbstub.c
gdbstub: Set current CPU on interruptions
2015-07-27 22:46:16 +03:00
HACKING
HACKING: Document vaddr type usage
2013-07-23 02:41:31 +02:00
hmp-commands.hx
hmp: add info iothreads command
2015-09-04 13:26:26 +02:00
hmp.c
hmp: add info iothreads command
2015-09-04 13:26:26 +02:00
hmp.h
hmp: add info iothreads command
2015-09-04 13:26:26 +02:00
iohandler.c
iohandler: Change return type of qemu_set_fd_handler to "void"
2015-06-12 13:26:21 +01:00
ioport.c
Merge remote-tracking branch 'remotes/bonzini/tags/for-upstream' into staging
2015-04-30 12:04:11 +01:00
iothread.c
rcu: actually register threads that have RCU read-side critical sections
2015-07-24 13:57:45 +02:00
kvm-all.c
Merge remote-tracking branch 'remotes/awilliam/tags/vfio-update-20150706.0' into staging
2015-07-07 09:22:40 +01:00
kvm-stub.c
kvm: some fixes to kvm_resamplefds_allowed
2015-07-06 12:15:14 -06:00
LICENSE
vfio: move hw/misc/vfio.c to hw/vfio/pci.c Move vfio.h into include/hw/vfio
2014-12-19 15:24:06 -07:00
main-loop.c
main-loop: fix qemu_notify_event for aio_notify optimization
2015-07-27 17:12:19 +01:00
MAINTAINERS
Merge remote-tracking branch 'remotes/cohuck/tags/s390x-20150903' into staging
2015-09-03 14:33:03 +01:00
Makefile
Makefile: qemu-ga: fix msi target error message
2015-09-01 13:16:26 -05:00
Makefile.objs
crypto: introduce new module for computing hash digests
2015-07-07 12:04:07 +02:00
Makefile.target
migration: move savevm.c inside migration/
2015-06-12 06:42:30 +02:00
memory_mapping.c
memory_mapping: Rework cpu related includes
2015-06-26 16:00:50 +02:00
memory.c
Merge memory_region_init_reservation() into memory_region_init_io()
2015-08-13 11:26:21 +01:00
module-common.c
module: implement module loading
2014-02-20 13:14:18 +01:00
monitor.c
hmp: add info iothreads command
2015-09-04 13:26:26 +02:00
nbd.c
qemu-nbd: only send a limited number of errno codes on the wire
2015-05-08 14:45:11 +02:00
numa.c
numa: Fix memory leak in numa_set_mem_node_id()
2015-07-15 16:57:50 -03:00
os-posix.c
rcu: do not create thread in pthread_atfork callback
2015-04-01 10:06:38 +02:00
os-win32.c
pidfile: stop making pidfile error a special case
2014-11-02 10:04:34 +03:00
page_cache.c
xbzrle: rebuild the cache_is_cached function
2015-01-15 17:49:43 +05:30
qapi-schema.json
s390x: Dump storage keys qmp command
2015-09-03 12:17:54 +02:00
qdev-monitor.c
Include qapi/qmp/qerror.h exactly where needed
2015-06-22 18:20:41 +02:00
qdict-test-data.txt
…
qemu-bridge-helper.c
qemu-bridge-helper: Fix fd leak in main()
2014-06-27 10:39:10 +02:00
qemu-char.c
qemu-char: Fix missed data on unix socket
2015-07-23 07:37:38 +02:00
qemu-coroutine-io.c
coroutine-io: Return -errno in case of error
2015-03-18 12:07:21 +01:00
qemu-coroutine-lock.c
coroutine: remove unnecessary parentheses in qemu_co_queue_empty
2015-04-30 16:05:49 +03:00
qemu-coroutine-sleep.c
coroutine: Drop co_sleep_ns
2014-08-29 10:46:58 +01:00
qemu-coroutine.c
coroutine: Clean up qemu_coroutine_enter()
2015-03-09 11:11:59 +01:00
qemu-doc.texi
qga: start a man page
2015-09-01 13:16:26 -05:00
qemu-ga.texi
qga: start a man page
2015-09-01 13:16:26 -05:00
qemu-img-cmds.hx
qemu-img: Add progress output for amend
2014-11-03 11:41:48 +00:00
qemu-img.c
qemu-img: Fix crash in amend invocation
2015-09-04 20:59:48 +02:00
qemu-img.texi
qemu-img: Add progress output for amend
2014-11-03 11:41:48 +00:00
qemu-io-cmds.c
qerror: Move #include out of qerror.h
2015-06-22 18:20:40 +02:00
qemu-io.c
qerror: Move #include out of qerror.h
2015-06-22 18:20:40 +02:00
qemu-log.c
qemu-log: Correct help text of 'log cpu_reset'
2015-02-10 09:27:20 +03:00
qemu-nbd.c
qemu-nbd: remove unnecessary qemu_notify_event()
2015-08-14 23:40:32 +02:00
qemu-nbd.texi
nbd: Miscellaneous typo fixes.
2014-05-24 00:07:29 +04:00
qemu-options-wrapper.h
…
qemu-options.h
…
qemu-options.hx
qemu-doc: fix typos
2015-07-24 13:57:45 +02:00
qemu-seccomp.c
seccomp: add mlockall to whitelist
2015-01-23 14:07:08 +01:00
qemu-tech.texi
qemu-doc: fix typos
2015-07-24 13:57:45 +02:00
qemu-timer.c
qemu-timer: initialize "timers_done_ev" to set
2015-07-22 12:41:32 +01:00
qemu.nsi
nsis: Improved support for parallel installation of 32 and 64 bit code
2013-11-07 07:02:44 +01:00
qemu.sasl
sasl: Avoid 'Could not find keytab file' in syslog
2014-03-15 13:54:18 +04:00
qjson.c
QJSON: Use OBJECT_CHECK
2015-05-11 08:59:07 -04:00
qmp-commands.hx
s390x: Dump storage keys qmp command
2015-09-03 12:17:54 +02:00
qmp.c
Include monitor/monitor.h exactly where needed
2015-06-22 18:20:41 +02:00
qtest.c
qtest: pre-buffer hex nibs
2015-05-22 15:58:22 -04:00
README
Use qemu-project.org domain name
2013-10-11 09:34:56 -07:00
rules.mak
make: load only required dependency files.
2015-08-13 14:08:25 +03:00
softmmu_template.h
exec: drop cpu_can_do_io, just read cpu->can_do_io
2015-08-14 23:40:32 +02:00
spice-qemu-char.c
spice: fix spice_chr_add_watch() pre-condition
2015-05-29 09:56:01 +02:00
tcg-runtime.c
tcg: Push tcg-runtime routines into exec/helper-*
2014-05-28 09:33:54 -07:00
tci.c
tcg: implement real ext_i32_i64 and extu_i32_i64 ops
2015-08-24 11:10:54 -07:00
thread-pool.c
thread-pool: clean up thread_pool_completion_bh()
2015-04-28 15:36:09 +02:00
thunk.c
linux-user: Allocate thunk size dynamically
2015-06-15 11:36:58 +03:00
tpm.c
Include monitor/monitor.h exactly where needed
2015-06-22 18:20:41 +02:00
trace-events
s390x: Enable new s390-storage-keys device
2015-09-03 12:17:54 +02:00
translate-all.c
linux-user: remove --enable-guest-base/--disable-guest-base
2015-08-24 11:14:17 -07:00
translate-all.h
translate-all: remove unnecessary argument to tb_invalidate_phys_range
2015-06-05 17:09:59 +02:00
user-exec.c
osdep.h: Remove qemu_printf
2015-08-19 16:29:53 +01:00
VERSION
Open 2.5 development tree
2015-08-11 23:15:55 +01:00
version.rc
Use qemu-project.org domain name
2013-10-11 09:34:56 -07:00
vl.c
smbios: move smbios code into a common folder
2015-08-13 14:08:30 +03:00
xen-common-stub.c
accel: Move Xen registration code to xen-common.c
2014-10-04 08:59:15 +02:00
xen-common.c
migration: Fix regression for xenfv and pc,accel=xen machine.
2015-08-03 16:13:40 +00:00
xen-hvm-stub.c
xen: Remove xen_cmos_set_s3_resume()
2015-03-10 08:15:33 +03:00
xen-hvm.c
Merge remote-tracking branch 'remotes/sstabellini/tags/xen-220615-3' into staging
2015-06-23 17:46:20 +01:00
xen-mapcache.c
xen: add a lock for the mapcache
2015-01-20 14:24:17 +00:00

README 

Read the documentation in qemu-doc.html or on http://wiki.qemu-project.org

- QEMU team
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