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migrate cache-size : power of 2

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qemu 2.11 need a power of 2 cache size.

"
Parameter 'xbzrle_cache_size' expects is invalid,
it should be bigger than target page size and a power of two
"

roundup to near power of 2 value
This commit is contained in:
Alexandre Derumier 2018-02-13 08:51:15 +01:00 committed by Wolfgang Bumiller
parent d108cb1eb2
commit 50d8dd5dc7
1 changed files with 7 additions and 0 deletions
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7
PVE/QemuMigrate.pm
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@ -692,6 +692,8 @@ sub phase2 {
# set cachesize to 10% of the total memory
my $memory = $conf->{memory} || $defaults->{memory};
my $cachesize = int($memory * 1048576 / 10);
$cachesize = round_powerof2($cachesize);
$self->log('info', "set cachesize: $cachesize");
eval {
PVE::QemuServer::vm_mon_cmd_nocheck($vmid, "migrate-set-cache-size", value => int($cachesize));
@ -1032,4 +1034,9 @@ sub final_cleanup {
# nothing to do
}
sub round_powerof2 {
return 1 if $_[0] < 2;
return 2 << int(log($_[0]-1)/log(2));
}
1;