Re: BIG performance hit with auditd on large cpus (>64 cpus)

(note to moderator: i sent this before from the wrong address, hope it doesn't get duplicated) Hi, we have a few SAP systems on RHEV (so virtualized on KVM) with >= 74 CPUs and >= 400G RAM. When the system is busy with large SAP jobs, it goes onto its knees with cpu %system up to 80%, thus making the SAP jobs run twice as long. As soon as you stop auditd everything returns to normal... Facts: RHEL6 instances on RHEL7 hosts. the rule set (see below) runs fine on any other system with less cpus (<64, maybe this is the cut off?). We have smaller systems with this rule set that rotate the audit file nearly every minute without any noticable performance hit, these SAP systems rotate once every 20-24hours.... Anyone has an idea? Here's an excerpt from "perf top": with auditd running: Samples: 28M of event 'cpu-clock', Event count (approx.): 236747914918 Overhead Shared Object Symbol 23.13% [kernel] [k] get_task_cred 10.05% [kernel] [k] audit_filter_rules 4.21% [kernel] [k] _spin_unlock_irqrestore 3.30% libdb2e.so.1 [.] sqlbfix 2.92% [kernel] [k] finish_task_switch 1.69% disp+work [.] rrol_in 1.69% disp+work [.] rrol_out 0.98% [kernel] [k] run_timer_softirq 0.96% [kernel] [k] rcu_process_gp_end auditd stopped: Samples: 3M of event 'cpu-clock', Event count (approx.): 526535382557 Overhead Shared Object Symbol 2.41% disp+work [.] memcmpU16 2.32% disp+work [.] MmxMalloc2 2.25% disp+work [.] ab_Rudi 2.07% disp+work [.] rrol_out 1.98% disp+work [.] rrol_in 1.95% disp+work [.] ab_CompByCmpCntx 1.88% libdb2e.so.1 [.] sqlbfix 1.73% disp+work [.] MmxFree2 1.62% [kernel] [k] run_timer_softirq 1.56% [kernel] [k] __do_softirq 1.39% disp+work [.] ab_InitRcDecompress These are the audit rules: auditctl -l -a always,exit -S all -F path=/etc/environment -F perm=wa -F auid>=400 -F key=CRIT_CONF