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migration: disable auto-converge during bulk block migration

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auto-converge and block migration currently do not play well together.
During block migration the auto-converge logic detects that ram
migration makes no progress and thus throttles down the vm until
it nearly stalls completely. Avoid this by disabling the throttling
logic during the bulk phase of the block migration.

Cc: qemu-stable@nongnu.org
Signed-off-by: Peter Lieven <pl@kamp.de>
Message-Id: <1506421996-12513-1-git-send-email-pl@kamp.de>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Peter Lieven 2017-09-26 12:33:16 +02:00 • committed by Dr. David Alan Gilbert
parent 31bc1d8481
commit 9ac78b6171
3 changed files with 17 additions and 1 deletions
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6
migration/ram.c
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@ -46,6 +46,7 @@
#include "exec/ram_addr.h"
#include "qemu/rcu_queue.h"
#include "migration/colo.h"
#include "migration/block.h"
/***********************************************************/
/* ram save/restore */
@ -825,7 +826,10 @@ static void migration_bitmap_sync(RAMState *rs)
/ (end_time - rs->time_last_bitmap_sync);
bytes_xfer_now = ram_counters.transferred;
if (migrate_auto_converge()) {
/* During block migration the auto-converge logic incorrectly detects
* that ram migration makes no progress. Avoid this by disabling the
* throttling logic during the bulk phase of block migration. */
if (migrate_auto_converge() && !blk_mig_bulk_active()) {
/* The following detection logic can be refined later. For now:
Check to see if the dirtied bytes is 50% more than the approx.
amount of bytes that just got transferred since the last time we