[pve-devel] applied: [PATCH v3 qemu-server 1/1] migrate cache-size : power of 2

[Wolfgang Bumiller]

applied, thanks

On Tue, Feb 13, 2018 at 08:51:15AM +0100, Alexandre Derumier wrote:
> 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
> ---
>  PVE/QemuMigrate.pm | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/PVE/QemuMigrate.pm b/PVE/QemuMigrate.pm
> index 937a855..fcad17c 100644
> --- a/PVE/QemuMigrate.pm
> +++ b/PVE/QemuMigrate.pm
> @@ -691,6 +691,8 @@ 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));
> @@ -1031,4 +1033,9 @@ sub final_cleanup {
>      # nothing to do
>  }
>  
> +sub round_powerof2 {
> + return 1 if $_[0] < 2;
> + return 2 << int(log($_[0]-1)/log(2));
> +}
> +
>  1;
> -- 
> 2.11.0