View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0017904 | CentOS-8 | dbus | public | 2020-12-03 02:32 | 2020-12-03 02:32 |
| Reporter | noeleon | Assigned To | |||
| Priority | normal | Severity | minor | Reproducibility | always |
| Status | new | Resolution | open | ||
| Product Version | 8.2.2004 | ||||
| Summary | 0017904: High dbus-daemon CPU | ||||
| Description | We have a system that does a very large number of user and group lookups. Since moving to CentOS 8 that dbus-daemon will saturate the CPU when there is a large number of these lookups occuring. dbus-monitor --system will show a repeaded stream of: sig 1606662078.428231 5237199 org.freedesktop.DBus <none> /org/freedesktop/DBus org.freedesktop.DBus NameOwnerChanged sig 1606662078.428237 2 org.freedesktop.DBus :1.2618601 /org/freedesktop/DBus org.freedesktop.DBus NameAcquired mc 1606662078.428475 2 :1.2618601 org.freedesktop.systemd1 /org/freedesktop/systemd1 org.freedesktop.systemd1.Manager GetDynamicUsers mr 1606662078.428657 2622380 :1.2 :1.2618601 2 sig 1606662078.428829 3467 org.freedesktop.DBus :1.2618601 /org/freedesktop/DBus org.freedesktop.DBus NameLost sig 1606662078.428839 5237200 org.freedesktop.DBus <none> /org/freedesktop/DBus org.freedesktop.DBus NameOwnerChanged mc 1606662078.429110 1 :1.2618602 org.freedesktop.DBus /org/freedesktop/DBus org.freedesktop.DBus Hello mr 1606662078.429119 1 org.freedesktop.DBus :1.2618602 1 sig 1606662078.429124 5237201 org.freedesktop.DBus <none> /org/freedesktop/DBus org.freedesktop.DBus NameOwnerChanged sig 1606662078.429130 2 org.freedesktop.DBus :1.2618602 /org/freedesktop/DBus org.freedesktop.DBus NameAcquired mc 1606662078.429254 2 :1.2618602 org.freedesktop.systemd1 /org/freedesktop/systemd1 org.freedesktop.systemd1.Manager GetDynamicUsers mr 1606662078.429324 2622381 :1.2 :1.2618602 2 We can comlpetely alleviate the load by removing 'systemd' from 'group:, 'passwd:' entries in /etc/nsswitch.conf, this removes and of the DynamicUser= functionality though and possibly other functionality? Is there a better solution to removing this functionality or is there a bug within dbus whereby GetDynamicUser which could be optimized. Thanks | ||||
| Steps To Reproduce | Any program that makes heavy use of getpwnam() or getgrouplist() | ||||
| Tags | No tags attached. | ||||
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2020-12-03 02:32 | noeleon | New Issue |
