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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:
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: