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Set qemu migration speed unlimited when migrating to file

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The qemu migration speed default is 32MiB/s as defined in migration.c

/* Migration speed throttling */
static int64_t max_throttle = (32 << 20);

There's no need to throttle migration when targeting a file, so set migration
speed to unlimited prior to migration, and restore to libvirt default value
after migration.

Default units is MB for migrate_set_speed monitor command, so
(INT64_MAX / (1024 * 1024)) is used for unlimited migration speed.

Tested with both json and text monitors.
This commit is contained in:
Jim Fehlig 2011-08-26 12:10:26 -06:00 committed by Jim Fehlig
parent 8fc40c511c
commit ef1065cf5a
1 changed files with 17 additions and 0 deletions
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17
src/qemu/qemu_migration.c
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@ -2718,6 +2718,16 @@ qemuMigrationToFile(struct qemud_driver *driver, virDomainObjPtr vm,
bool restoreLabel = false; bool restoreLabel = false;
virCommandPtr cmd = NULL; virCommandPtr cmd = NULL;
int pipeFD[2] = { -1, -1 }; int pipeFD[2] = { -1, -1 };
unsigned long saveMigBandwidth = priv->migMaxBandwidth;
/* Increase migration bandwidth to unlimited since target is a file.
* Failure to change migration speed is not fatal. */
if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) == 0) {
qemuMonitorSetMigrationSpeed(priv->mon,
QEMU_DOMAIN_FILE_MIG_BANDWIDTH_MAX);
priv->migMaxBandwidth = QEMU_DOMAIN_FILE_MIG_BANDWIDTH_MAX;
qemuDomainObjExitMonitorWithDriver(driver, vm);
}
if (qemuCapsGet(priv->qemuCaps, QEMU_CAPS_MIGRATE_QEMU_FD) && if (qemuCapsGet(priv->qemuCaps, QEMU_CAPS_MIGRATE_QEMU_FD) &&
(!compressor || pipe(pipeFD) == 0)) { (!compressor || pipe(pipeFD) == 0)) {
@ -2829,6 +2839,13 @@ qemuMigrationToFile(struct qemud_driver *driver, virDomainObjPtr vm,
ret = 0; ret = 0;
cleanup: cleanup:
/* Restore max migration bandwidth */
if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) == 0) {
qemuMonitorSetMigrationSpeed(priv->mon, saveMigBandwidth);
priv->migMaxBandwidth = saveMigBandwidth;
qemuDomainObjExitMonitorWithDriver(driver, vm);
}
VIR_FORCE_CLOSE(pipeFD[0]); VIR_FORCE_CLOSE(pipeFD[0]);
VIR_FORCE_CLOSE(pipeFD[1]); VIR_FORCE_CLOSE(pipeFD[1]);
virCommandFree(cmd); virCommandFree(cmd);