Bug 1950282
| Summary: | shutdown those unneeded network interfaces to save memory for kdump | |||
|---|---|---|---|---|
| Product: | Red Hat Enterprise Linux 8 | Reporter: | Coiby <coxu> | |
| Component: | kexec-tools | Assignee: | Coiby <coxu> | |
| Status: | CLOSED ERRATA | QA Contact: | xiaoying yan <yiyan> | |
| Severity: | low | Docs Contact: | ||
| Priority: | unspecified | |||
| Version: | 8.5 | CC: | cye, ruyang | |
| Target Milestone: | beta | Keywords: | Triaged | |
| Target Release: | --- | |||
| Hardware: | Unspecified | |||
| OS: | Unspecified | |||
| Whiteboard: | ||||
| Fixed In Version: | kexec-tools-2.0.25-3.el8 | Doc Type: | If docs needed, set a value | |
| Doc Text: | Story Points: | --- | ||
| Clone Of: | ||||
| : | 2120188 (view as bug list) | Environment: | ||
| Last Closed: | 2023-05-16 09:02:40 UTC | Type: | Bug | |
| Regression: | --- | Mount Type: | --- | |
| Documentation: | --- | CRM: | ||
| Verified Versions: | Category: | --- | ||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | ||
| Cloudforms Team: | --- | Target Upstream Version: | ||
| Embargoed: | ||||
| Bug Depends On: | ||||
| Bug Blocks: | 2120188 | |||
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (kexec-tools bug fix and enhancement update), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2023:2953 |
Description of problem: Even with no carrier, a network interface is requested up, i.e., t IFF_UP flag is set. Thus netdev_ops->ndo_open is called to allocate the memory resources. For example, it's observed on ibm-p9b-19.ibm2.lab.eng.bos.redhat.com for the first kernel, i40e consumed ~15GB memory. If we shutdown those inactive network interfaces by "ip link set dev enP2p1s0fX down" would reduce the memory consumption from 16899MB to 5438MB, ``` [root@ibm-p9b-19 ~]# free -m total used free shared buff/cache available Mem: 63185 16899 44118 22 2167 45221 Swap: 32607 0 32607 [root@ibm-p9b-19 ~]# ip addr show 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: enP2p1s0f0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000 link/ether ac:1f:6b:56:e7:9c brd ff:ff:ff:ff:ff:ff inet 10.16.214.110/23 brd 10.16.215.255 scope global dynamic noprefixroute enP2p1s0f0 valid_lft 70363sec preferred_lft 70363sec inet6 2620:52:0:10d6:ae1f:6bff:fe56:e79c/64 scope global dynamic noprefixroute valid_lft 2591884sec preferred_lft 604684sec inet6 fe80::ae1f:6bff:fe56:e79c/64 scope link noprefixroute valid_lft forever preferred_lft forever 3: enP2p1s0f1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000 link/ether ac:1f:6b:56:e7:9d brd ff:ff:ff:ff:ff:ff 4: enP2p1s0f2: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000 link/ether ac:1f:6b:56:e7:9e brd ff:ff:ff:ff:ff:ff 5: enP2p1s0f3: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000 link/ether ac:1f:6b:56:e7:9f brd ff:ff:ff:ff:ff:ff [root@ibm-p9b-19 ~]# ip link set dev enP2p1s0f1 down [root@ibm-p9b-19 ~]# ip link set dev enP2p1s0f2 down [root@ibm-p9b-19 ~]# ip link set dev enP2p1s0f3 down [root@ibm-p9b-19 ~]# free -m total used free shared buff/cache available Mem: 63185 5438 55579 22 2167 56682 Swap: 32607 0 32607 [root@ibm-p9b-19 ~]# ip addr show 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: enP2p1s0f0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000 link/ether ac:1f:6b:56:e7:9c brd ff:ff:ff:ff:ff:ff inet 10.16.214.110/23 brd 10.16.215.255 scope global dynamic noprefixroute enP2p1s0f0 valid_lft 70330sec preferred_lft 70330sec inet6 2620:52:0:10d6:ae1f:6bff:fe56:e79c/64 scope global dynamic noprefixroute valid_lft 2591852sec preferred_lft 604652sec inet6 fe80::ae1f:6bff:fe56:e79c/64 scope link noprefixroute valid_lft forever preferred_lft forever 3: enP2p1s0f1: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN group default qlen 1000 link/ether ac:1f:6b:56:e7:9d brd ff:ff:ff:ff:ff:ff 4: enP2p1s0f2: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN group default qlen 1000 link/ether ac:1f:6b:56:e7:9e brd ff:ff:ff:ff:ff:ff 5: enP2p1s0f3: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN group default qlen 1000 link/ether ac:1f:6b:56:e7:9f brd ff:ff:ff:ff:ff:ff ``` kexec-tools should shutdown those unneeded network interfaces to save memory. Version-Release number of selected component (if applicable): How reproducible: Steps to Reproduce: 1. 2. 3. Actual results: Expected results: Additional info: