diff options
Diffstat (limited to 'qapi/migration.json')
| -rw-r--r-- | qapi/migration.json | 13 |
1 files changed, 5 insertions, 8 deletions
diff --git a/qapi/migration.json b/qapi/migration.json index dffa60fd91..8843e74b59 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: # |