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livemigrate : activate xbzrle cache

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This help migrate for vm with of lot of memory access (like database)

live migration tests working:

kvm 1.2 -> kvm 1.2  (xbzrle set on both side)
kvm 1.1 -> kvm 1.2 (xbzrle on target)
kvm 1.1 -> kvm 1.1 (xbzrle not set, qmp command try to set xbzrle but fail)

failing migration

kvm 1.2 -> kvm 1.1 fail, but this is expected.

I tested with a memory benchmark running on the vm with 4GB ram

without xbzrle : migration take 10min, with many network hang
with xbzrle : migration take 1min, no hang

I display xbzrle counters for debug purpose, we can remove them later

Signed-off-by: Alexandre Derumier <aderumier@odiso.com>
This commit is contained in:
Alexandre Derumier 2012-08-28 12:46:08 +02:00 committed by Dietmar Maurer
parent d454d04033
commit e18b0b9964
2 changed files with 29 additions and 0 deletions
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22
PVE/QemuMigrate.pm
View File

@ -325,6 +325,21 @@ sub phase2 {
# start migration
my $start = time();
my $capabilities = {};
$capabilities->{capability} = "xbzrle";
$capabilities->{state} = JSON::true;
eval {
PVE::QemuServer::vm_mon_cmd_nocheck($vmid, "migrate-set-capabilities", capabilities => [$capabilities]);
};
#set cachesize 10% of the total memory
my $cachesize = int($conf->{memory}*1048576/10);
eval {
PVE::QemuServer::vm_mon_cmd_nocheck($vmid, "migrate-set-cache-size", value => $cachesize);
};
eval {
PVE::QemuServer::vm_mon_cmd_nocheck($vmid, "migrate", uri => "tcp:localhost:$lport");
};
@ -363,11 +378,18 @@ sub phase2 {
my $trans = $stat->{ram}->{transferred} || 0;
my $rem = $stat->{ram}->{remaining} || 0;
my $total = $stat->{ram}->{total} || 0;
my $xbzrlecachesize = $stat->{"xbzrle-cache"}->{"cache-size"} || 0;
my $xbzrlebytes = $stat->{"xbzrle-cache"}->{"bytes"} || 0;
my $xbzrlepages = $stat->{"xbzrle-cache"}->{"pages"} || 0;
my $xbzrlecachemiss = $stat->{"xbzrle-cache"}->{"cache-miss"} || 0;
my $xbzrleoverflow = $stat->{"xbzrle-cache"}->{"overflow"} || 0;
#reduce sleep if remainig memory if lower than the everage transfert
$usleep = 300000 if $rem < $avglstat;
$self->log('info', "migration status: $stat->{status} (transferred ${trans}, " .
"remaining ${rem}), total ${total})");
$self->log('info', "migration xbzrle cachesize: ${xbzrlecachesize} transferred ${xbzrlebytes} pages ${xbzrlepages} cachemiss ${xbzrlecachemiss} overflow ${xbzrleoverflow}");
}
$lstat = $stat->{ram}->{transferred};

7
PVE/QemuServer.pm
View File

@ -2790,6 +2790,13 @@ sub vm_start {
eval { vm_mon_cmd($vmid, "migrate_set_downtime", value => $migrate_downtime); };
}
if($migratedfrom) {
my $capabilities = {};
$capabilities->{capability} = "xbzrle";
$capabilities->{state} = JSON::true;
eval { PVE::QemuServer::vm_mon_cmd_nocheck($vmid, "migrate-set-capabilities", capabilities => [$capabilities]); };
}
vm_balloonset($vmid, $conf->{balloon}) if $conf->{balloon};
});