Gfrktyl

I have an OpenWRT router I set up many months ago. It's a TP-Link Archer C5 v1.20, which comes with 128M of RAM. Lately it's been running out of memory (logs show the OOM killer coming in). I installed rsyslog to get remote logging, this is my rsyslog.conf file:

module(load="imuxsock")

module(load="imklog")

module(load="imudp")

input(type="imudp" port="514")

#module(load="imtcp")

#input(type="imtcp" port="514")



$ActionFileDefaultTemplate RSYSLOG_TraditionalFileFormat



#*.info;mail.none;authpriv.none;cron.none  /var/log/messages



#authpriv.*                                /var/log/secure



#mail.*                                    /var/log/maillog



#cron.*                                    /var/log/cron



#local7.*                                  /var/log/boot.log



*.* @10.0.1.49:514

As you can see I've commented out all the local logs and just left the one that does remote logging.

I'm running htop but the RES and SHR usage of all processes seems stable. My next thought was the RAMdisk (I did have that problem before, which led me to comment out all the local log files). However, disk usage also seems to be stable:

# ls -ld $(find / -mtime -1 -type f | egrep -v '/proc|/dev|/sys')

-rw-------    1 root     root          2414 Dec 20 12:23 /overlay/upper/root/.bash_history

-rw-r--r--    1 root     root           952 Dec 21 11:12 /overlay/upper/root/meminfo.base

-rw-r--r--    1 root     root           952 Dec 21 11:31 /overlay/upper/root/meminfo.new

-rw-------    1 root     root          2414 Dec 20 12:23 /root/.bash_history

-rw-r--r--    1 root     root           952 Dec 21 11:12 /root/meminfo.base

-rw-r--r--    1 root     root           952 Dec 21 11:31 /root/meminfo.new

-rw-r--r--    1 root     root           568 Dec 21 11:33 /tmp/dhcp.leases

-rw-r--r--    1 root     root             5 Dec 21 10:45 /tmp/run/wifi-phy0.pid

-rw-r--r--    1 root     root            24 Dec 21 10:44 /tmp/state/dnsmasqsec

I did a cat /proc/meminfo|sort, once shortly after booting up and then again after 20 minutes, so I could do a diff. Here's the result:

# diff meminfo.base meminfo.new

1,4c1,4

< Active(anon):       2904 kB

< Active(file):       5164 kB

< Active:             8068 kB

< AnonPages:          2852 kB

---

> Active(anon):       2864 kB

> Active(file):       5252 kB

> Active:             8116 kB

> AnonPages:          2812 kB

7c7

< Cached:             7744 kB

---

> Cached:             7808 kB

9c9

< Committed_AS:       7120 kB

---

> Committed_AS:       6972 kB

12,13c12,13

< Inactive(file):     4372 kB

< Inactive:           4408 kB

---

> Inactive(file):     4348 kB

> Inactive:           4384 kB

15,17c15,17

< Mapped:             3168 kB

< MemAvailable:      64540 kB

< MemFree:           76508 kB

---

> Mapped:             3164 kB

> MemAvailable:      66524 kB

> MemFree:           78460 kB

21,23c21,23

< PageTables:          328 kB

< SReclaimable:       7484 kB

< SUnreclaim:         5528 kB

---

> PageTables:          320 kB

> SReclaimable:       7488 kB

> SUnreclaim:         5544 kB

25c25

< Slab:              13012 kB

---

> Slab:              13032 kB

However, this does not tell me much. Any ideas?