Configure Transparent Huge Pages (THP) to madvise to Avoid Increased Memory Usage

NiedrigStufe 1Automatisiertcockroachdb

Beschreibung

Linux Transparent Huge Pages (THP) is a kernel feature that automatically manages large memory pages to improve performance for some workloads. However, for databases such as CockroachDB, this behavior can cause unpredictable latency spikes, increased memory fragmentation, and excessive CPU overhead due to THP defragmentation. Cockroach Labs recommends configuring THP to madvise instead of the default always mode. The benchmark rates this recommendation Manual; the automated check covers its objective pass criterion. Passes when madvise is the selected (bracketed) Transparent Huge Pages mode.

So wird geprüft

Prüfmethode: Shell-Befehl

shell

out=$(cat /sys/kernel/mm/transparent_hugepage/enabled 2>/dev/null) || exit 1; printf '%s\n' "$out" | grep -o '\[[a-z]*\]'

Erwartete Ausgabe: [madvise]

So wird behoben

Behebungsmethode: Anleitung oder Infrastruktur-Patch

echo madvise > /sys/kernel/mm/transparent_hugepage/enabled (and defrag), then persist it at boot (kernel parameter transparent_hugepage=madvise or a systemd unit).

Eigenschaften

Betriebssysteme: Beliebig
Tags: cockroachdbos
Referenz: CIS CockroachDB v25.x Benchmark v1.0.0 - 2.6 Configure Transparent Huge Pages (THP) to madvise to Avoid Increased Memory Usage

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shell

tmaegis scan --target cockroachdb