c300b8e80b
- vfio/migration: Add support for manual clear vfio dirty log - vfio: Maintain DMA mapping range for the container - linux-headers: update against 5.10 and manual clear vfio dirty log series - arm/acpi: Fix when make qemu-system-aarch64 at x86_64 host bios_tables_test fail reason: __aarch64__ macro let build_pptt at x86_64 and aarch64 host build different function that let bios_tables_test fail. - pl031: support rtc-timer property for pl031 - feature: Add logs for vm start and destroy - feature: Add log for each modules - log: Add log at boot & cpu init for aarch64 - bugfix: irq: Avoid covering object refcount of qemu_irq - i386: cache passthrough: Update AMD 8000_001D.EAX[25:14] based on vCPU topo - freeclock: set rtc_date_diff for X86 - freeclock: set rtc_date_diff for arm - freeclock: add qmp command to get time offset of vm in seconds - tests: Disable filemonitor testcase - shadow_dev: introduce shadow dev for virtio-net device - pl011: reset read FIFO when UARTTIMSC=0 & UARTICR=0xffff - tests: virt: Update expected ACPI tables for virt test(update BinDir) - arm64: Add the cpufreq device to show cpufreq info to guest - hw/arm64: add vcpu cache info support - tests: virt: Allow changes to PPTT test table - cpu: add Cortex-A72 processor kvm target support - cpu: add Kunpeng-920 cpu support - net: eepro100: validate various address valuesi(CVE-2021-20255) - ide: ahci: add check to avoid null dereference (CVE-2019-12067) - vdpa: set vring enable only if the vring address has already been set - docs: Add generic vhost-vdpa device documentation - vdpa: don't suspend/resume device when vdpa device not started - vdpa: correct param passed in when unregister save - vdpa: suspend function return 0 when the vdpa device is stopped - vdpa: support vdpa device suspend/resume - vdpa: move memory listener to the realize stage - vdpa: implement vdpa device migration - vhost: implement migration state notifier for vdpa device - vhost: implement post resume bh - vhost: implement savevm_handler for vdpa device - vhost: implement vhost_vdpa_device_suspend/resume - vhost: implement vhost-vdpa suspend/resume - vhost: add vhost_dev_suspend/resume_op - vhost: introduce bytemap for vhost backend logging - vhost-vdpa: add migration log ops for VhostOps - vhost-vdpa: add VHOST_BACKEND_F_BYTEMAPLOG - hw/usb: reduce the vpcu cost of UHCI when VNC disconnect - virtio-net: update the default and max of rx/tx_queue_size - virtio-net: set the max of queue size to 4096 - virtio-net: fix max vring buf size when set ring num - virtio-net: bugfix: do not delete netdev before virtio net - monitor: Discard BLOCK_IO_ERROR event when VM rebooted - vhost-user: add unregister_savevm when vhost-user cleanup - vhost-user: add vhost_set_mem_table when vm load_setup at destination - vhost-user: quit infinite loop while used memslots is more than the backend limit - fix qemu-core when vhost-user-net config with server mode - vhost-user: Add support reconnect vhost-user socket - vhost-user: Set the acked_features to vm's featrue - i6300esb watchdog: bugfix: Add a runstate transition - hw/net/rocker_of_dpa: fix double free bug of rocker device - net/dump.c: Suppress spurious compiler warning - pcie: Add pcie-root-port fast plug/unplug feature - pcie: Compat with devices which do not support Link Width, such as ioh3420 - qdev/monitors: Fix reundant error_setg of qdev_add_device - qemu-nbd: set timeout to qemu-nbd socket - qemu-nbd: make native as the default aio mode - nbd/server.c: fix invalid read after client was already free - virtio-scsi: bugfix: fix qemu crash for hotplug scsi disk with dataplane - virtio: bugfix: check the value of caches before accessing it - virtio: print the guest virtio_net features that host does not support - virtio: bugfix: add rcu_read_lock when vring_avail_idx is called - virtio: check descriptor numbers - migration: report multiFd related thread pid to libvirt - migration: report migration related thread pid to libvirt - cpu/features: fix bug for memory leakage - doc: Update multi-thread compression doc - migration: Add compress_level sanity check - migration: Add zstd support in multi-thread compression - migration: Add multi-thread compress ops - migration: Refactoring multi-thread compress migration - migration: Add multi-thread compress method - migration: skip cache_drop for bios bootloader and nvram template - oslib-posix: optimise vm startup time for 1G hugepage - monitor/qmp: drop inflight rsp if qmp client broken - ps2: fix oob in ps2 kbd - Currently, while kvm and qemu can not handle some kvm exit, qemu will do vm_stop, which will make vm in pause state. This action make vm unrecoverable, so send guest panic to libvirt instead. - vhost: cancel migration when vhost-user restarted during migraiton Signed-off-by: Jiabo Feng <fengjiabo1@huawei.com>
87 lines
3.6 KiB
Diff
87 lines
3.6 KiB
Diff
From 55e5f8cafda3c7d4a91e9d58c7b3259476e0dab9 Mon Sep 17 00:00:00 2001
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From: Chuan Zheng <zhengchuan@huawei.com>
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Date: Sat, 30 Jan 2021 16:36:47 +0800
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Subject: [PATCH] doc: Update multi-thread compression doc
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Modify the doc to fit the previous changes.
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Signed-off-by: Chuan Zheng <zhengchuan@huawei.com>
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Signed-off-by: Zeyu Jin <jinzeyu@huawei.com>
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Signed-off-by: Ying Fang <fangying1@huawei.com>
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---
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docs/multi-thread-compression.txt | 31 ++++++++++++++++++-------------
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1 file changed, 18 insertions(+), 13 deletions(-)
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diff --git a/docs/multi-thread-compression.txt b/docs/multi-thread-compression.txt
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index 95b1556f67..450e5de469 100644
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--- a/docs/multi-thread-compression.txt
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+++ b/docs/multi-thread-compression.txt
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@@ -33,14 +33,15 @@ thread compression can be used to accelerate the compression process.
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The decompression speed of Zlib is at least 4 times as quick as
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compression, if the source and destination CPU have equal speed,
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-keeping the compression thread count 4 times the decompression
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-thread count can avoid resource waste.
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+and you choose Zlib as compression method, keeping the compression
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+thread count 4 times the decompression thread count can avoid resource waste.
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Compression level can be used to control the compression speed and the
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-compression ratio. High compression ratio will take more time, level 0
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-stands for no compression, level 1 stands for the best compression
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-speed, and level 9 stands for the best compression ratio. Users can
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-select a level number between 0 and 9.
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+compression ratio. High compression ratio will take more time,
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+level 1 stands for the best compression speed, and higher level means higher
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+compression ration. For Zlib, users can select a level number between 0 and 9,
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+where level 0 stands for no compression. For Zstd, users can select a
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+level number between 1 and 22.
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When to use the multiple thread compression in live migration
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@@ -116,16 +117,19 @@ to support the multiple thread compression migration:
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2. Activate compression on the source:
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{qemu} migrate_set_capability compress on
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-3. Set the compression thread count on source:
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+3. Set the compression method:
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+ {qemu} migrate_set_parameter compress_method zstd
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+
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+4. Set the compression thread count on source:
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{qemu} migrate_set_parameter compress-threads 12
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-4. Set the compression level on the source:
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+5. Set the compression level on the source:
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{qemu} migrate_set_parameter compress-level 1
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-5. Set the decompression thread count on destination:
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+6. Set the decompression thread count on destination:
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{qemu} migrate_set_parameter decompress-threads 3
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-6. Start outgoing migration:
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+7. Start outgoing migration:
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{qemu} migrate -d tcp:destination.host:4444
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{qemu} info migrate
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Capabilities: ... compress: on
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@@ -136,6 +140,7 @@ The following are the default settings:
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compress-threads: 8
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decompress-threads: 2
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compress-level: 1 (which means best speed)
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+ compress_method: zlib
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So, only the first two steps are required to use the multiple
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thread compression in migration. You can do more if the default
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@@ -143,7 +148,7 @@ settings are not appropriate.
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TODO
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====
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-Some faster (de)compression method such as LZ4 and Quicklz can help
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-to reduce the CPU consumption when doing (de)compression. If using
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-these faster (de)compression method, less (de)compression threads
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+Comparing to Zlib, Some faster (de)compression method such as LZ4
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+and Quicklz can help to reduce the CPU consumption when doing (de)compression.
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+If using these faster (de)compression method, less (de)compression threads
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are needed when doing the migration.
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--
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2.27.0
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