diff options
| author | Keqian Zhu <zhukeqian1@huawei.com> | 2020-04-13 18:15:08 +0800 |
|---|---|---|
| committer | Dr. David Alan Gilbert <dgilbert@redhat.com> | 2020-05-07 17:40:24 +0100 |
| commit | cbbf818224faf5ede75c876e4900c9f8e6b6c0db (patch) | |
| tree | 784aaa0ad9cf5964fb0c5219d629afea051423bb /qapi | |
| parent | 58602676dfd00f519248d4936b0711b7967cbf62 (diff) | |
migration/throttle: Add cpu-throttle-tailslow migration parameter
At the tail stage of throttling, the Guest is very sensitive to
CPU percentage while the @cpu-throttle-increment is excessive
usually at tail stage.
If this parameter is true, we will compute the ideal CPU percentage
used by the Guest, which may exactly make the dirty rate match the
dirty rate threshold. Then we will choose a smaller throttle increment
between the one specified by @cpu-throttle-increment and the one
generated by ideal CPU percentage.
Therefore, it is compatible to traditional throttling, meanwhile
the throttle increment won't be excessive at tail stage. This may
make migration time longer, and is disabled by default.
Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com>
Message-Id: <20200413101508.54793-1-zhukeqian1@huawei.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Diffstat (limited to 'qapi')
| -rw-r--r-- | qapi/migration.json | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/qapi/migration.json b/qapi/migration.json index eca2981d0a..ee6c5a0cae 100644 --- a/qapi/migration.json +++ b/qapi/migration.json @@ -552,6 +552,21 @@ # auto-converge detects that migration is not making # progress. The default value is 10. (Since 2.7) # +# @cpu-throttle-tailslow: Make CPU throttling slower at tail stage +# At the tail stage of throttling, the Guest is very +# sensitive to CPU percentage while the @cpu-throttle +# -increment is excessive usually at tail stage. +# If this parameter is true, we will compute the ideal +# CPU percentage used by the Guest, which may exactly make +# the dirty rate match the dirty rate threshold. Then we +# will choose a smaller throttle increment between the +# one specified by @cpu-throttle-increment and the one +# generated by ideal CPU percentage. +# Therefore, it is compatible to traditional throttling, +# meanwhile the throttle increment won't be excessive +# at tail stage. +# The default value is false. (Since 5.1) +# # @tls-creds: ID of the 'tls-creds' object that provides credentials for # establishing a TLS connection over the migration data channel. # On the outgoing side of the migration, the credentials must @@ -631,6 +646,7 @@ 'compress-level', 'compress-threads', 'decompress-threads', 'compress-wait-thread', 'throttle-trigger-threshold', 'cpu-throttle-initial', 'cpu-throttle-increment', + 'cpu-throttle-tailslow', 'tls-creds', 'tls-hostname', 'tls-authz', 'max-bandwidth', 'downtime-limit', 'x-checkpoint-delay', 'block-incremental', 'multifd-channels', @@ -676,6 +692,21 @@ # auto-converge detects that migration is not making # progress. The default value is 10. (Since 2.7) # +# @cpu-throttle-tailslow: Make CPU throttling slower at tail stage +# At the tail stage of throttling, the Guest is very +# sensitive to CPU percentage while the @cpu-throttle +# -increment is excessive usually at tail stage. +# If this parameter is true, we will compute the ideal +# CPU percentage used by the Guest, which may exactly make +# the dirty rate match the dirty rate threshold. Then we +# will choose a smaller throttle increment between the +# one specified by @cpu-throttle-increment and the one +# generated by ideal CPU percentage. +# Therefore, it is compatible to traditional throttling, +# meanwhile the throttle increment won't be excessive +# at tail stage. +# The default value is false. (Since 5.1) +# # @tls-creds: ID of the 'tls-creds' object that provides credentials # for establishing a TLS connection over the migration data # channel. On the outgoing side of the migration, the credentials @@ -763,6 +794,7 @@ '*throttle-trigger-threshold': 'int', '*cpu-throttle-initial': 'int', '*cpu-throttle-increment': 'int', + '*cpu-throttle-tailslow': 'bool', '*tls-creds': 'StrOrNull', '*tls-hostname': 'StrOrNull', '*tls-authz': 'StrOrNull', @@ -834,6 +866,21 @@ # auto-converge detects that migration is not making # progress. (Since 2.7) # +# @cpu-throttle-tailslow: Make CPU throttling slower at tail stage +# At the tail stage of throttling, the Guest is very +# sensitive to CPU percentage while the @cpu-throttle +# -increment is excessive usually at tail stage. +# If this parameter is true, we will compute the ideal +# CPU percentage used by the Guest, which may exactly make +# the dirty rate match the dirty rate threshold. Then we +# will choose a smaller throttle increment between the +# one specified by @cpu-throttle-increment and the one +# generated by ideal CPU percentage. +# Therefore, it is compatible to traditional throttling, +# meanwhile the throttle increment won't be excessive +# at tail stage. +# The default value is false. (Since 5.1) +# # @tls-creds: ID of the 'tls-creds' object that provides credentials # for establishing a TLS connection over the migration data # channel. On the outgoing side of the migration, the credentials @@ -921,6 +968,7 @@ '*throttle-trigger-threshold': 'uint8', '*cpu-throttle-initial': 'uint8', '*cpu-throttle-increment': 'uint8', + '*cpu-throttle-tailslow': 'bool', '*tls-creds': 'str', '*tls-hostname': 'str', '*tls-authz': 'str', |