Samuel Zhang 97dc5cf045 migration/rdma: add x-rdma-chunk-size parameter ...

The default 1MB RDMA chunk size causes slow live migration because
each chunk triggers a write_flush (ibv_post_send). For 8GB RAM,
1MB chunk size produces ~15000 flushes vs ~3700 with 1024MB chunk size.

Add x-rdma-chunk-size parameter to configure the RDMA chunk size for
faster migration.
Usage: `migrate_set_parameter x-rdma-chunk-size 1024M`

Performance with RDMA live migration of 8GB RAM VM:

| x-rdma-chunk-size (B) | time (s) | throughput (MB/s) |
|-----------------------|----------|-------------------|
| 1M (default)          | 37.915   |  1,007            |
| 32M                   | 17.880   |  2,260            |
| 1024M                 |  4.368   | 17,529            |

Signed-off-by: Samuel Zhang <guoqing.zhang@amd.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Acked-by: Li Zhijian <lizhijian@fujitsu.com>
Tested-by: Li Zhijian <lizhijian@fujitsu.com>
Acked-by: Fabiano Rosas <farosas@suse.de>
Acked-by: Peter Xu <peterx@redhat.com>
Link: https://lore.kernel.org/r/20260427031401.3895523-1-guoqing.zhang@amd.com
Signed-off-by: Peter Xu <peterx@redhat.com>

2026-05-05 12:35:24 -04:00

..

accelerator.json

qapi: Refill doc comments to conform to conventions

2025-11-04 13:34:42 +01:00

acpi-hest.json

qapi: Clean up whitespace between definitions

2025-11-04 13:34:42 +01:00

acpi.json

qapi: add cross-references to acpi.json

2025-07-14 12:52:46 +02:00

audio.json

qapi/audio: Fix description markup of AudiodevDBusOptions @nsamples

2025-11-04 13:34:42 +01:00

authz.json

qapi: add cross-references to authz.json

2025-07-14 12:52:46 +02:00

block-core.json

Fix several typos in documentation (found by codespell)

2026-03-23 19:55:24 +03:00

block-export.json

qapi/block-export: Document FUSE's multi-threading

2026-03-10 12:12:04 +01:00

block.json

qapi: add cross-references to block layer

2025-07-14 12:55:17 +02:00

char.json

chardev: add logtimestamp option

2026-02-13 10:00:02 +01:00

common.json

docs/sphinx: remove special parsing for freeform sections

2025-07-14 10:08:27 +02:00

compat.json

docs/sphinx: remove special parsing for freeform sections

2025-07-14 10:08:27 +02:00

control.json

qapi: add cross-references to misc modules

2025-07-14 12:58:13 +02:00

crypto.json

qapi: Clean up whitespace between definitions

2025-11-04 13:34:42 +01:00

cryptodev.json

qapi: remove trivial "Returns:" sections

2025-07-14 12:35:29 +02:00

cxl.json

hw/cxl/events: Updates for rev3.2 memory module event record

2026-02-20 13:04:45 -05:00

dump.json

qapi: Add more cross-references

2025-07-29 14:51:20 +02:00

ebpf.json

qapi: add cross-references to misc modules

2025-07-14 12:58:13 +02:00

error.json

docs/sphinx: remove special parsing for freeform sections

2025-07-14 10:08:27 +02:00

introspect.json

qapi: Refill doc comments to conform to conventions

2025-11-04 13:34:42 +01:00

job.json

Fix several typos in documentation (found by codespell)

2026-03-23 19:55:24 +03:00

machine-common.json

qapi: Refill doc comments to conform to conventions

2025-11-04 13:34:42 +01:00

machine-s390x.json

qapi: Refill doc comments to conform to conventions

2025-11-04 13:34:42 +01:00

machine.json

Remove the qemu-system-microblazeel target from the build

2026-03-02 09:48:10 +01:00

meson.build

qapi/acpi-hest: add an interface to do generic CPER error injection

2025-10-05 08:06:32 -04:00

migration.json

migration/rdma: add x-rdma-chunk-size parameter

2026-05-05 12:35:24 -04:00

misc-arm.json

qdev: Add an OasMode property type

2026-03-24 14:02:29 +00:00

misc-i386.json

qapi: Clean up whitespace between definitions

2025-11-04 13:34:42 +01:00

misc.json

qapi/iothread: introduce poll-weight parameter for aio-poll

2026-04-29 11:31:44 -04:00

net.json

qapi: Clean up whitespace between definitions

2025-11-04 13:34:42 +01:00

opts-visitor.c

…

pci.json

qapi: add cross-references to pci.json

2025-07-14 12:58:13 +02:00

pragma.json

qdev: Add a SsidSizeMode property type

2026-03-24 14:02:29 +00:00

qapi-clone-visitor.c

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qapi-dealloc-visitor.c

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qapi-forward-visitor.c

qapi: change 'unsigned special_features' to 'uint64_t features'

2025-02-10 15:45:04 +01:00

qapi-schema.json

qapi/acpi-hest: add an interface to do generic CPER error injection

2025-10-05 08:06:32 -04:00

qapi-type-helpers.c

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qapi-util.c

qapi: change 'unsigned special_features' to 'uint64_t features'

2025-02-10 15:45:04 +01:00

qapi-visit-core.c

qapi: change 'unsigned special_features' to 'uint64_t features'

2025-02-10 15:45:04 +01:00

qdev.json

qapi: Refill doc comments to conform to conventions

2025-11-04 13:34:42 +01:00

qmp-dispatch.c

monitor: Fix deadlock in monitor_cleanup

2026-03-31 15:35:19 +02:00

qmp-event.c

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qmp-registry.c

qapi: change 'unsigned special_features' to 'uint64_t features'

2025-02-10 15:45:04 +01:00

qobject-input-visitor.c

qapi: change 'unsigned special_features' to 'uint64_t features'

2025-02-10 15:45:04 +01:00

qobject-output-visitor.c

qapi: change 'unsigned special_features' to 'uint64_t features'

2025-02-10 15:45:04 +01:00

qom.json

qapi/iothread: introduce poll-weight parameter for aio-poll

2026-04-29 11:31:44 -04:00

replay.json

qapi: add cross-references to replay.json

2025-07-14 12:58:13 +02:00

rocker.json

qapi: remove trivial "Returns:" sections

2025-07-14 12:35:29 +02:00

run-state.json

target/i386: convert SEV-ES termination requests to guest panic events

2026-02-07 14:31:38 +01:00

sockets.json

qapi: Refill doc comments to conform to conventions

2025-11-04 13:34:42 +01:00

stats.json

qapi: Refill doc comments to conform to conventions

2025-11-04 13:34:42 +01:00

string-input-visitor.c

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string-output-visitor.c

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tpm.json

qapi: remove trivial "Returns:" sections

2025-07-14 12:35:29 +02:00

trace-events

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trace.h

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trace.json

qapi: rephrase return docs to avoid type name

2025-07-14 12:35:39 +02:00

transaction.json

qapi: add cross-references to block layer

2025-07-14 12:55:17 +02:00

uefi.json

Fix several typos in documentation (found by codespell)

2026-03-23 19:55:24 +03:00

ui.json

ui/gtk: Turn clipboard flag into runtime option

2026-04-28 18:53:59 +04:00

vfio.json

vfio/migration: Send VFIO_MIGRATION event before PRE_COPY_P2P transition

2026-02-18 10:54:57 +01:00

virtio.json

Support per-head resolutions with virtio-gpu

2026-03-06 17:25:47 +00:00

yank.json

qapi: add cross-references to yank.json

2025-07-14 12:58:13 +02:00