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Increased "hubble observe" CPU usage after upgrade from 1.15.15 to 1.15.16 or newer

affects/v1.15This issue affects v1.15 branchThis issue affects v1.15 branch

affects/v1.16This issue affects v1.16 branchThis issue affects v1.16 branch

affects/v1.17This issue affects v1.17 branchThis issue affects v1.17 branch

affects/v1.18This issue affects v1.18 branchThis issue affects v1.18 branch

area/hubbleImpacts hubble server or relayImpacts hubble server or relay

kind/performanceThere is a performance impact of this.There is a performance impact of this.

kind/regressionThis functionality worked fine before, but was broken in a newer release of Cilium.This functionality worked fine before, but was broken in a newer release of Cilium.

Status: Open.

#42564 In cilium/cilium;

· tporeba opened on Oct 31, 2025

High memory usage caused by “Starting GC of connection tracking”

area/datapathImpacts bpf/ or low-level forwarding details, including map management and monitor messages.Impacts bpf/ or low-level forwarding details, including map management and monitor messages.

kind/bugThis is a bug in the Cilium logic.This is a bug in the Cilium logic.

kind/community-reportThis was reported by a user in the Cilium community, eg via Slack.This was reported by a user in the Cilium community, eg via Slack.

kind/performanceThere is a performance impact of this.There is a performance impact of this.

needs/triageThis issue requires triaging to establish severity and next steps.This issue requires triaging to establish severity and next steps.

Status: Open.

#42098 In cilium/cilium;

· mertcangokgoz opened on Oct 9, 2025

CFP: add new <code>scale-profile</code> helm value

kind/cfpCilium Feature ProposalCilium Feature Proposal

kind/featureThis introduces new functionality.This introduces new functionality.

kind/performanceThere is a performance impact of this.There is a performance impact of this.

sig/scalabilityImpacts how well Cilium handles a high rate of events or churn.Impacts how well Cilium handles a high rate of events or churn.

Status: Open.

#41964 In cilium/cilium;

· msune opened on Oct 1, 2025

the latency of outgoing packet transmission increases under high load conditions

kind/bugThis is a bug in the Cilium logic.This is a bug in the Cilium logic.

kind/community-reportThis was reported by a user in the Cilium community, eg via Slack.This was reported by a user in the Cilium community, eg via Slack.

kind/performanceThere is a performance impact of this.There is a performance impact of this.

need-more-infoMore information is required to further debug or fix the issue.More information is required to further debug or fix the issue.

needs/triageThis issue requires triaging to establish severity and next steps.This issue requires triaging to establish severity and next steps.

Status: Open.

#41620 In cilium/cilium;

· zhongguanqun opened on Sep 10, 2025

BPF masquerading: Traffic to ExternalIP node addresses is masqueraded

feature/bpf-masquerading

feature/snatRelates to SNAT or Masquerading of trafficRelates to SNAT or Masquerading of traffic

kind/enhancementThis would improve or streamline existing functionality.This would improve or streamline existing functionality.

kind/performanceThere is a performance impact of this.There is a performance impact of this.

pinnedThese issues are not marked stale by our issue bot.These issues are not marked stale by our issue bot.

Status: Open.

#41462 In cilium/cilium;

· pchaigno opened on Sep 1, 2025

Cilium 1.17 uses more CPU resources than 1.16

area/agentCilium agent related.Cilium agent related.

info-completedThe GH issue has received a reply from the authorThe GH issue has received a reply from the author

kind/bugThis is a bug in the Cilium logic.This is a bug in the Cilium logic.

kind/community-reportThis was reported by a user in the Cilium community, eg via Slack.This was reported by a user in the Cilium community, eg via Slack.

kind/performanceThere is a performance impact of this.There is a performance impact of this.

needs/triageThis issue requires triaging to establish severity and next steps.This issue requires triaging to establish severity and next steps.

Status: Open.

#41399 In cilium/cilium;

· olocheratwork opened on Aug 27, 2025

Investigate memory consumption of KPR + kube-proxy

area/kprAnything related to our kube-proxy replacement.Anything related to our kube-proxy replacement.

area/kube-proxyIssues related to kube-proxy (not the kube-proxy-free mode).Issues related to kube-proxy (not the kube-proxy-free mode).

kind/performanceThere is a performance impact of this.There is a performance impact of this.

pinnedThese issues are not marked stale by our issue bot.These issues are not marked stale by our issue bot.

Status: Open.

Task

#41192 In cilium/cilium;

· pchaigno opened on Aug 15, 2025

Combine NAT Map Iterations into a single observable pass

feature/conntrack

feature/egress-gatewayImpacts the egress IP gateway feature.Impacts the egress IP gateway feature.

feature/snatRelates to SNAT or Masquerading of trafficRelates to SNAT or Masquerading of traffic

kind/cfpCilium Feature ProposalCilium Feature Proposal

kind/featureThis introduces new functionality.This introduces new functionality.

kind/performanceThere is a performance impact of this.There is a performance impact of this.

pinnedThese issues are not marked stale by our issue bot.These issues are not marked stale by our issue bot.

Status: Open.

#37004 In cilium/cilium;

· tommyp1ckles opened on Jan 16, 2025

Batch ctMap GC deletes

area/datapathImpacts bpf/ or low-level forwarding details, including map management and monitor messages.Impacts bpf/ or low-level forwarding details, including map management and monitor messages.

feature/conntrack

kind/cfpCilium Feature ProposalCilium Feature Proposal

kind/featureThis introduces new functionality.This introduces new functionality.

kind/performanceThere is a performance impact of this.There is a performance impact of this.

pinnedThese issues are not marked stale by our issue bot.These issues are not marked stale by our issue bot.

Status: Open.

Task

#36981 In cilium/cilium;

· tommyp1ckles opened on Jan 15, 2025

ipsec: SPI-based xfrm lookup

area/encryptionImpacts encryption support such as IPSec, WireGuard, or kTLS.Impacts encryption support such as IPSec, WireGuard, or kTLS.

feature/ipsecRelates to Cilium's IPsec featureRelates to Cilium's IPsec feature

kind/performanceThere is a performance impact of this.There is a performance impact of this.

pinnedThese issues are not marked stale by our issue bot.These issues are not marked stale by our issue bot.

Status: Open.

Task

#36257 In cilium/cilium;

· jschwinger233 opened on Nov 29, 2024

Support per-CPU xfrm state for Linux 6.13+

area/datapathImpacts bpf/ or low-level forwarding details, including map management and monitor messages.Impacts bpf/ or low-level forwarding details, including map management and monitor messages.

area/encryptionImpacts encryption support such as IPSec, WireGuard, or kTLS.Impacts encryption support such as IPSec, WireGuard, or kTLS.

feature/ipsecRelates to Cilium's IPsec featureRelates to Cilium's IPsec feature

kind/enhancementThis would improve or streamline existing functionality.This would improve or streamline existing functionality.

kind/performanceThere is a performance impact of this.There is a performance impact of this.

pinnedThese issues are not marked stale by our issue bot.These issues are not marked stale by our issue bot.

Status: Open.

Enhancement

#35994 In cilium/cilium;

· jschwinger233 opened on Nov 15, 2024

CFP: Improve encrypted traffic performance over load shared network bonds

area/encryptionImpacts encryption support such as IPSec, WireGuard, or kTLS.Impacts encryption support such as IPSec, WireGuard, or kTLS.

feature/wireguardRelates to Cilium's Wireguard featureRelates to Cilium's Wireguard feature

kind/cfpCilium Feature ProposalCilium Feature Proposal

kind/featureThis introduces new functionality.This introduces new functionality.

kind/performanceThere is a performance impact of this.There is a performance impact of this.

pinnedThese issues are not marked stale by our issue bot.These issues are not marked stale by our issue bot.

Status: Open.

#35667 In cilium/cilium;

· solidDoWant opened on Oct 30, 2024