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run env: always return proper value for default zfs max arc size

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In preparation for fixing #6285 [0].

`0` means to just skip writing the module parameter. But (especially)
with the upcoming change in ZFS 2.3 - which makes the size basically
that of the system memory minus 1 GiB - we want to always write some
value.

[0] https://bugzilla.proxmox.com/show_bug.cgi?id=6285

Signed-off-by: Christoph Heiss <c.heiss@proxmox.com>
This commit is contained in:
Christoph Heiss 2025-04-04 14:46:46 +02:00 committed by Thomas Lamprecht
parent b8176fd732
commit 54c76175f0
2 changed files with 32 additions and 19 deletions
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9
Proxmox/Install/RunEnv.pm
View File

@ -337,14 +337,15 @@ sub default_zfs_arc_max {
my $product = Proxmox::Install::ISOEnv::get('product');
my $total_memory = query_total_memory();
# By default limit PVE and low-memory systems, for all others let ZFS decide on its own by
# returning `0`, which causes the installer to skip writing the `zfs_arc_max` module parameter.
# By default limit PVE and low-memory systems, for all just use the 50% of system memory
if ($product ne 'pve') {
return 0 if $total_memory >= 2048 && $product ne 'pmg';
return 0 if $total_memory >= 4096; # PMG's base memory requirement is much higer
my $zfs_default_mib = int(sprintf('%.0f', $total_memory / 2));
return $zfs_default_mib if $total_memory >= 2048 && $product ne 'pmg';
return $zfs_default_mib if $total_memory >= 4096; # PMG's base memory requirement is much higher
}
my $default_mib = $total_memory * $ZFS_ARC_SYSMEM_PERCENTAGE;
# int(sprintf()) rounds up instead of truncating
my $rounded_mib = int(sprintf('%.0f', $default_mib));
if ($rounded_mib > $ZFS_ARC_MAX_SIZE_MIB) {

42
test/zfs-arc-max.pl
View File

@ -21,8 +21,10 @@ sub mock_product {
);
}
my %default_tests = (
16 => 64, # at least 64 MiB
use constant ZFS_ARC_MIN_MIB => 64;
my %default_tests_pve = (
16 => ZFS_ARC_MIN_MIB, # at least 64 MiB
1024 => 102,
4 * 1024 => 410,
8 * 1024 => 819,
@ -31,26 +33,36 @@ my %default_tests = (
1024 * 1024 => 16384, # maximum of 16 GiB
);
while (my ($total_mem, $expected) = each %default_tests) {
my %default_tests_others = (
16 => ZFS_ARC_MIN_MIB, # at least 64 MiB
1024 => 102,
4 * 1024 => 2048,
8 * 1024 => 4096,
150 * 1024 => 76800,
160 * 1024 => 81920,
1024 * 1024 => 524288,
);
mock_product('pve');
while (my ($total_mem, $expected) = each %default_tests_pve) {
$proxmox_install_runenv->redefine(
query_total_memory => sub { return $total_mem; },
);
mock_product('pve');
is(Proxmox::Install::RunEnv::default_zfs_arc_max(), $expected,
"$expected MiB should be zfs_arc_max for PVE with $total_mem MiB system memory");
"zfs_arc_max should default to $expected for pve with $total_mem MiB system memory");
}
mock_product('pbs');
is(Proxmox::Install::RunEnv::default_zfs_arc_max(), $total_mem < 2048 ? $expected : 0,
"zfs_arc_max should default to `0` for PBS with $total_mem MiB system memory");
while (my ($total_mem, $expected) = each %default_tests_others) {
$proxmox_install_runenv->redefine(
query_total_memory => sub { return $total_mem; },
);
mock_product('pmg');
is(Proxmox::Install::RunEnv::default_zfs_arc_max(), $total_mem < 4096 ? $expected : 0,
"zfs_arc_max should default to `0` for PMG with $total_mem MiB system memory");
mock_product('pdm');
is(Proxmox::Install::RunEnv::default_zfs_arc_max(), $total_mem < 2048 ? $expected : 0,
"zfs_arc_max should default to `0` for PDM with $total_mem MiB system memory");
foreach my $product ('pbs', 'pmg', 'pdm') {
mock_product($product);
is(Proxmox::Install::RunEnv::default_zfs_arc_max(), $expected,
"zfs_arc_max should default to $expected for $product with $total_mem MiB system memory");
}
}
my @clamp_tests = (