To people who aren't used to dealing with Unix-like systems this is a
common complaint.
What show system memory is really doing is running free.
BTW Vyattans - to avoid this in the future, please consider this a
enhancement request to alias 'show system memory' to 'free -m'
In olden days, RAM was expensive, but it's also very fast; far faster
than disk, so Linux would buffer and cache items to RAM that it
'thought' it would use, and keep it near full all of the time, because
it was mere nanoseconds to dump and fill with something else. The
thought was that you paid oodles for this expenseive RAM, might as well
use it to speed the system up even if you don't have a lot of use for it
as RAM, maybe we can use it as a tertiary level CPU cache, or a nice
disk buffer. To really see what is 'freeable' it should look at free ram
as the free column plus buffers and cache.
If you use free -m from the comand line you will see something akin to:
vyatta:~# free -m
total used free shared buffers cached
Mem: 1011 995 16 0 467 427
-/+ buffers/cache: 100 911
Swap: 0 0 0
Which shows that the system is really consuming only 100 Megs of RAM but
has almost 900 cached.
Nick Davey wrote:
> Hi All,
> I've noticed some pretty intense memory usage out of my Vyatta router:
>
> [EMAIL PROTECTED]> show system memory
> total used free shared buffers cached
> Mem: 255268 250956 4312 0 142652 32900
> Swap: 0 0 0
> Total: 255268 250956 4312
>
> I know the spacing is a bit off, but free memory is only 4312 bytes.
> Examining the process memory usage under the shell shows that the xorp
> daemons are using the lions share of the memory:
>
> core:~# ps aux | more
> USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
> root 1 0.0 0.2 1948 636 ? Ss Oct31 0:03 init [2]
> root 2 0.0 0.0 0 0 ? S Oct31 0:00
> [migration/0]
> root 3 0.0 0.0 0 0 ? SN Oct31 0:00
> [ksoftirqd/0]
> root 4 0.0 0.0 0 0 ? S Oct31 0:00
> [watchdog/0]
> root 5 0.0 0.0 0 0 ? S< Oct31 0:00
> [events/0]
> root 6 0.0 0.0 0 0 ? S< Oct31 0:00 [khelper]
> root 7 0.0 0.0 0 0 ? S< Oct31 0:00 [kthread]
> root 31 0.0 0.0 0 0 ? S< Oct31 0:00
> [kblockd/0]
> root 52 0.0 0.0 0 0 ? S< Oct31 0:00 [kseriod]
> root 86 0.0 0.0 0 0 ? S Oct31 0:00 [pdflush]
> root 87 0.0 0.0 0 0 ? S Oct31 0:00
> [pdflush]
> root 88 0.0 0.0 0 0 ? S< Oct31 0:00 [kswapd0]
> root 89 0.0 0.0 0 0 ? S< Oct31 0:00 [aio/0]
> root 1494 0.0 0.0 0 0 ? S< Oct31 0:00 [khubd]
> root 1580 0.0 0.0 0 0 ? S< Oct31 0:00 [ata/0]
> root 1581 0.0 0.0 0 0 ? S< Oct31 0:00 [ata_aux]
> root 1843 0.0 0.0 0 0 ? S< Oct31 0:09
> [kjournald]
> root 2006 0.0 0.2 2176 612 ? S<s Oct31 0:00 udevd
> --daemon
> root 2835 0.0 0.0 0 0 ? S< Oct31 0:00
> [kpsmoused]
> root 2930 0.0 0.0 0 0 ? S< Oct31 0:00
> [kgameportd]
> root 3118 0.0 0.0 0 0 ? S< Oct31 0:00
> [kmirrord]
> root 3123 0.0 0.0 0 0 ? S< Oct31 0:00 [ksnapd]
> root 3150 0.0 0.0 0 0 ? S< Oct31 0:00
> [kjournald]
> root 3543 0.0 0.1 1584 384 ? Ss Oct31 0:00
> /sbin/klogd -x
> root 3738 0.0 0.2 2196 752 ? Ss Oct31 0:00
> /usr/sbin/cron
> root 3904 0.5 5.7 28840 14636 ? Ss Oct31 376:11
> /opt/vyatta/sbin/xorp_rtrmgr -b /opt/vyatta/etc/config/config.boot
> root 3909 0.0 2.3 19972 6032 ? S Oct31 36:38
> xorp_rl_firewall
> root 3923 0.0 0.0 0 0 ? S< Oct31 0:00
> [unionfs_siod/0]
> root 4083 0.0 4.2 24492 10752 ? S Oct31 35:04 xorp_fea
> root 4213 0.0 3.2 21600 8324 ? S Oct31 9:37 xorp_rib
> root 4216 0.0 2.3 19928 6080 ? S Oct31 4:03
> xorp_rl_protocols
> root 4229 0.0 2.7 18520 7008 ? S Oct31 32:59
> /usr/sbin/snmpd -p /var/run/snmpd.pid
> root 4230 0.0 2.3 20036 6104 ? S Oct31 4:12
> xorp_rl_service
> root 4886 0.0 0.6 2656 1620 ? Ss Oct31 0:02
> /opt/vyatta/bin/dhcpd -f -pf /var/run/dhcpd-unused.pid -cf
> /opt/vyatta/etc/dhcpd.conf -lf /v
> ar/log/dhcpd.leases
> root 4901 0.0 0.4 4928 1096 ? Ss Oct31 0:00
> /usr/sbin/sshd -o HostKey=/etc/ssh/ssh_host_key -o Protocol=2 -p 22
> root 4909 0.0 5.7 29256 14608 ? Ss Oct31 6:32
> /opt/vyatta/sbin/xgdaemon
> root 4916 0.0 1.1 4664 2984 ? Ss Oct31 0:05
> /usr/sbin/lighttpd -D -f /opt/vyatta/etc/lighttpd.conf
> root 4930 0.0 2.8 20704 7180 ? S Oct31 11:52
> xorp_policy
> root 4933 0.0 2.8 21088 7388 ? S Oct31 55:04
> xorp_static_routes
> root 4948 0.0 0.1 1580 496 tty1 Ss+ Oct31 0:00
> /sbin/getty 38400 tty1
> root 4949 0.0 0.1 1576 496 tty2 Ss+ Oct31 0:00
> /sbin/getty 38400 tty2
> root 4950 0.0 0.1 1576 496 tty3 Ss+ Oct31 0:00
> /sbin/getty 38400 tty3
> root 4951 0.0 0.1 1580 496 tty4 Ss+ Oct31 0:00
> /sbin/getty 38400 tty4
> root 4952 0.0 0.1 1576 496 tty5 Ss+ Oct31 0:00
> /sbin/getty 38400 tty5
> root 4953 0.0 0.1 1576 496 tty6 Ss+ Oct31 0:00
> /sbin/getty 38400 tty6
> root 4954 0.0 0.1 1580 504 ttyS0 Ss+ Oct31 0:00
> /sbin/getty -L ttyS0 9600 vt100
> root 4965 0.1 2.4 20072 6156 ? S Oct31 89:46
> xorp_rl_system
> root 5389 0.0 1.6 4152 4152 ? SLs Oct31 0:09
> /opt/vyatta/bin/ntpd -c /etc/ntp/ntp.conf -n -g
> root 5408 0.0 0.2 1632 604 ? Ss Oct31 0:01
> /sbin/syslogd
> root 5422 0.1 4.2 24836 10796 ? S Oct31 120:59
> xorp_ospfv2
> root 5423 0.0 2.3 19936 6116 ? S Oct31 15:19
> xorp_rl_interfaces
> root 5441 0.0 2.3 19936 6100 ? S Oct31 12:18
> /opt/vyatta/sbin/vrrpd -i eth3 -v 2 -p 150 -d 1 192.168.20.92
> <http://192.168.20.92>
> root 7885 0.0 2.3 19932 6104 ? S Nov05 3:27
> /opt/vyatta/sbin/vrrpd -i eth2 -v 1 -p 150 -d 1 192.168.20.62
> <http://192.168.20.62>
> root 29414 2.6 0.9 7700 2372 ? Ss 22:45 0:00 sshd:
> [EMAIL PROTECTED]/0
> root 29416 0.3 0.6 3940 1640 pts/0 Ss 22:45 0:00 -bash
> root 29420 0.0 0.3 3432 996 pts/0 R+ 22:45 0:00 ps aux
> root 29421 0.0 0.2 3052 700 pts/0 R+ 22:45 0:00 more
>
> This router really isn't doing a whole heck of a lot, OSPF is by far
> the most resource intensive process on this router. I've included the
> config as an attatchment. Any insight would be much appreciated.
>
> Thanks,
> Nick
> ------------------------------------------------------------------------
>
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