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authorHyman Huang(黄勇) <yong.huang@smartx.com>2023-07-28 23:10:40 +0800
committerMarkus Armbruster <armbru@redhat.com>2023-08-02 09:33:38 +0200
commitef965377325e186ce1f73e5f40d07d77e2cc9410 (patch)
treec221eec42cd0bb6728be1ed0026fc6af16d016fe /qapi/migration.json
parent8abc81150f2de51eabd75ef13117f6f1561a18a5 (diff)
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qapi: Craft the dirty-limit capability comment
Signed-off-by: Hyman Huang(黄勇) <yong.huang@smartx.com> Message-ID: <169073570563.19893.2928364761104733482-2@git.sr.ht> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
Diffstat (limited to 'qapi/migration.json')
-rw-r--r--qapi/migration.json13
1 files changed, 5 insertions, 8 deletions
diff --git a/qapi/migration.json b/qapi/migration.json
index dffa60f..8843e74 100644
--- a/qapi/migration.json
+++ b/qapi/migration.json
@@ -519,14 +519,11 @@
# are present. 'return-path' capability must be enabled to use
# it. (since 8.1)
#
-# @dirty-limit: If enabled, migration will use the dirty-limit
-# algorithim to throttle down guest instead of auto-converge
-# algorithim. Throttle algorithim only works when vCPU's dirtyrate
-# greater than 'vcpu-dirty-limit', read processes in guest os
-# aren't penalized any more, so this algorithim can improve
-# performance of vCPU during live migration. This is an optional
-# performance feature and should not affect the correctness of the
-# existing auto-converge algorithim. (Since 8.1)
+# @dirty-limit: If enabled, migration will throttle vCPUs as needed to
+# keep their dirty page rate within @vcpu-dirty-limit. This can
+# improve responsiveness of large guests during live migration,
+# and can result in more stable read performance. Requires KVM
+# with accelerator property "dirty-ring-size" set. (Since 8.1)
#
# Features:
#