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migrate/cpu-throttle: Add max-cpu-throttle migration parameter

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Currently, the default maximum CPU throttle for migration is
99(CPU_THROTTLE_PCT_MAX). This is too big and can make a remarkable
performance effect for the guest. We see a lot of packets latency
exceed 500ms when the CPU_THROTTLE_PCT_MAX reached. This patch set
adds a new max-cpu-throttle parameter to limit the CPU throttle.

Signed-off-by: Li Qiang <liq3ea@gmail.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Li Qiang 2018-08-01 06:00:20 -07:00 • committed by Juan Quintela
parent 3eb21fe9e5
commit 4cbc9c7ffd
5 changed files with 52 additions and 5 deletions
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1
migration/migration.h
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@ -266,6 +266,7 @@ bool migrate_colo_enabled(void);
bool migrate_use_block(void);
bool migrate_use_block_incremental(void);
int migrate_max_cpu_throttle(void);
bool migrate_use_return_path(void);
bool migrate_use_compression(void);