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Message-ID: <ca2fa17ffd670a60e72071ff401139c104d1e854.camel@odiso.com>
From: aderumier@odiso.com
To: pve-devel <pve-devel@pve.proxmox.com>
Date: Fri, 22 Jan 2021 16:06:26 +0100
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Subject: Re: [pve-devel] qemu live migration: bigger downtime recently
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I have tried to add a log to display the current status state of the
migration,
and It don't catch any "active" state, but "completed" directly.
Here another sample with a bigger downtime of 14s (real downtime, I
have checked with a ping to be sure)
2021-01-22 16:02:53 starting migration of VM 391 to node 'kvm13'
(10.3.94.70)
2021-01-22 16:02:53 starting VM 391 on remote node 'kvm13'
2021-01-22 16:02:55 start remote tunnel
2021-01-22 16:02:56 ssh tunnel ver 1
2021-01-22 16:02:56 starting online/live migration on
tcp:10.3.94.70:60000
2021-01-22 16:02:56 set migration_caps
2021-01-22 16:02:56 migration speed limit: 8589934592 B/s
2021-01-22 16:02:56 migration downtime limit: 100 ms
2021-01-22 16:02:56 migration cachesize: 2147483648 B
2021-01-22 16:02:56 set migration parameters
2021-01-22 16:02:56 start migrate command to tcp:10.3.94.70:60000
2021-01-22 16:03:11 status: completed ---> added log
2021-01-22 16:03:11 migration speed: 1092.27 MB/s - downtime 14424 ms
2021-01-22 16:03:11 migration status: completed
2021-01-22 16:03:14 migration finished successfully (duration 00:00:21)
TASK OK
my $merr = $@;
$self->log('info', "migrate uri => $ruri failed: $merr") if $merr;
my $lstat = 0;
my $usleep = 1000000;
my $i = 0;
my $err_count = 0;
my $lastrem = undef;
my $downtimecounter = 0;
while (1) {
$i++;
my $avglstat = $lstat ? $lstat / $i : 0;
usleep($usleep);
my $stat;
eval {
$stat = mon_cmd($vmid, "query-migrate");
};
if (my $err = $@) {
$err_count++;
warn "query migrate failed: $err\n";
$self->log('info', "query migrate failed: $err");
if ($err_count <= 5) {
usleep(1000000);
next;
}
die "too many query migrate failures - aborting\n";
}
$self->log('info', "status: $stat->{status}"); ---> added log
Le vendredi 22 janvier 2021 à 15:34 +0100, aderumier@odiso.com a
écrit :
> Hi,
>
> I have notice recently bigger downtime on qemu live migration.
> (I'm not sure if it's after qemu update or qemu-server update)
>
> migration: type=insecure
>
> qemu-server 6.3-2
> pve-qemu-kvm 5.1.0-7
>
> (I'm not sure about the machine running qemu version)
>
>
>
> Here a sample:
>
>
>
> 2021-01-22 15:28:38 starting migration of VM 226 to node 'kvm13'
> (10.3.94.70)
> 2021-01-22 15:28:42 starting VM 226 on remote node 'kvm13'
> 2021-01-22 15:28:44 start remote tunnel
> 2021-01-22 15:28:45 ssh tunnel ver 1
> 2021-01-22 15:28:45 starting online/live migration on
> tcp:10.3.94.70:60000
> 2021-01-22 15:28:45 set migration_caps
> 2021-01-22 15:28:45 migration speed limit: 8589934592 B/s
> 2021-01-22 15:28:45 migration downtime limit: 100 ms
> 2021-01-22 15:28:45 migration cachesize: 268435456 B
> 2021-01-22 15:28:45 set migration parameters
> 2021-01-22 15:28:45 start migrate command to tcp:10.3.94.70:60000
> 2021-01-22 15:28:47 migration speed: 1024.00 MB/s - downtime 2117 ms
> 2021-01-22 15:28:47 migration status: completed
> 2021-01-22 15:28:51 migration finished successfully (duration
> 00:00:13)
> TASK OK
>
> That's strange because I don't see the memory transfert loop logs
>
>
>
> Migrate back to original host is working
>
> 2021-01-22 15:29:34 starting migration of VM 226 to node 'kvm2'
> (::ffff:10.3.94.50)
> 2021-01-22 15:29:36 starting VM 226 on remote node 'kvm2'
> 2021-01-22 15:29:39 start remote tunnel
> 2021-01-22 15:29:40 ssh tunnel ver 1
> 2021-01-22 15:29:40 starting online/live migration on
> tcp:[::ffff:10.3.94.50]:60000
> 2021-01-22 15:29:40 set migration_caps
> 2021-01-22 15:29:40 migration speed limit: 8589934592 B/s
> 2021-01-22 15:29:40 migration downtime limit: 100 ms
> 2021-01-22 15:29:40 migration cachesize: 268435456 B
> 2021-01-22 15:29:40 set migration parameters
> 2021-01-22 15:29:40 start migrate command to
> tcp:[::ffff:10.3.94.50]:60000
> 2021-01-22 15:29:41 migration status: active (transferred 396107554,
> remaining 1732018176), total 2165383168)
> 2021-01-22 15:29:41 migration xbzrle cachesize: 268435456 transferred
> 0
> pages 0 cachemiss 0 overflow 0
> 2021-01-22 15:29:42 migration status: active (transferred 973010921,
> remaining 1089216512), total 2165383168)
> 2021-01-22 15:29:42 migration xbzrle cachesize: 268435456 transferred
> 0
> pages 0 cachemiss 0 overflow 0
> 2021-01-22 15:29:43 migration status: active (transferred 1511925476,
> remaining 483463168), total 2165383168)
> 2021-01-22 15:29:43 migration xbzrle cachesize: 268435456 transferred
> 0
> pages 0 cachemiss 0 overflow 0
> 2021-01-22 15:29:44 migration speed: 512.00 MB/s - downtime 148 ms
> 2021-01-22 15:29:44 migration status: completed
> 2021-01-22 15:29:47 migration finished successfully (duration
> 00:00:13)
> TASK OK
>
>
> Then migrate it again like the first migration is working too
>
>
> 2021-01-22 15:31:07 starting migration of VM 226 to node 'kvm13'
> (10.3.94.70)
> 2021-01-22 15:31:10 starting VM 226 on remote node 'kvm13'
> 2021-01-22 15:31:12 start remote tunnel
> 2021-01-22 15:31:13 ssh tunnel ver 1
> 2021-01-22 15:31:13 starting online/live migration on
> tcp:10.3.94.70:60000
> 2021-01-22 15:31:13 set migration_caps
> 2021-01-22 15:31:13 migration speed limit: 8589934592 B/s
> 2021-01-22 15:31:13 migration downtime limit: 100 ms
> 2021-01-22 15:31:13 migration cachesize: 268435456 B
> 2021-01-22 15:31:13 set migration parameters
> 2021-01-22 15:31:13 start migrate command to tcp:10.3.94.70:60000
> 2021-01-22 15:31:14 migration status: active (transferred 1092088188,
> remaining 944365568), total 2165383168)
> 2021-01-22 15:31:14 migration xbzrle cachesize: 268435456 transferred
> 0
> pages 0 cachemiss 0 overflow 0
> 2021-01-22 15:31:15 migration speed: 1024.00 MB/s - downtime 55 ms
> 2021-01-22 15:31:15 migration status: completed
> 2021-01-22 15:31:19 migration finished successfully (duration
> 00:00:12)
> TASK OK
>
>
> Any idea ? Maybe a specific qemu version bug ?
>
>
>
>