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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 First batch of s390x patches for 2.5: 2015-09-03 14:33:03 +01:00
include First batch of s390x patches for 2.5: 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 Monitor patches 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 cmpbge emulation improvements 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 qemu: add .exrc 2012-09-07 09:02:44 +03:00
.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 sysemu: avoid proliferation of include/ subdirectories 2013-04-15 18:19:25 +02:00
bt-vhci.c sysemu: avoid proliferation of include/ subdirectories 2013-04-15 18:19:25 +02:00
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 - miscellaneous cleanups for TCG (Emilio) and NBD (Bogdan) 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 VFIO updates for 2.4-rc0 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 First batch of s390x patches for 2.5: 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 vl.c: In qemu -h output, only print options for the arch we are running as 2011-12-19 10:27:33 -06:00
qemu-options.h vl.c: Move option generation logic into a wrapper file 2011-12-19 10:27:33 -06:00
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 xen-220615, more SOB lines 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