Not real memory in VPS

KeyJey

Hi, I have my 3th DNSONLY server in Host1plus.com VPS with 512MB of RAM and I get memory errors when it should have most of the memory available.

Look here: http://snag.gy/17vpX.jpg

And here: http://snag.gy/a7ODN.jpg

I should say that's an overselling issue, there's no real memory for the VPS instances, right ?

linuxthefish

http://www.linuxatemyram.com/play.html

Try munch.c!

rmlhhd

Looks like cache is eating your RAM, run this to clear it -

free && sync && echo 3 > /proc/sys/vm/drop_caches && free

KeyJey

@linuxthefish - I'll check

@rmlhhd I get error:

[email protected] [/]# free && sync && echo 3 > /proc/sys/vm/drop_caches && free
             total       used       free     shared    buffers     cached
Mem:        524288     522376       1912          0          0     475232
-/+ buffers/cache:      47144     477144
Swap:       262144     111856     150288
-bash: /proc/sys/vm/drop_caches: Permission denied

Sady

What is output of free -m ?

Sady

Ah, got that.

You've 477144 MB RAM free. Check http://www.linuxatemyram.com for reference.

Sady

Can you tell me that which SSH client are you using ?

Seems better than putty.

KeyJey

StephenIzzy said: Can you tell me that which SSH client are you using ?

MobaXterm --> mobaxterm.mobatek.net

KeyJey

[email protected] [/]# free -m
             total       used       free     shared    buffers     cached
Mem:           512        491         20          0          0        422
-/+ buffers/cache:         68        443
Swap:          256         85        170
[email protected] [/]#

AlbaHost

@KeyJey said:
linuxthefish - I'll check

rmlhhd I get error:

[email protected] [/]# free && sync && echo 3 > /proc/sys/vm/drop_caches && free
total used free shared buffers cached
Mem: 524288 522376 1912 0 0 475232
-/+ buffers/cache: 47144 477144
Swap: 262144 111856 150288
-bash: /proc/sys/vm/drop_caches: Permission denied

Permission denied because i assume your vps are openvz, and not xen/kvm. To perform drop caches are available in xen/kvm but not in openvz.

hostnoob

@StephenIzzy said:
Ah, got that.

You've 477144 MB RAM free. Check http://www.linuxatemyram.com for reference.

KB :P

jar

cat /proc/user_beancounters

No buffer space available sounds like you're hitting tcpsndbuf, tcprcvbuf, or othersockbuf. You may also be hitting the limit for iptables rules in the container configuration. You're running CSF, I'm willing to bet you've opted to ban countries in the firewall. That's usually the reason I see people hitting that limit with iptables on VZ.

For memory, the value of physpages (what is reflected in free command) is not your sole memory limitation. You should see what limit you are hitting from the same output as above.

HSN

What plattform are they using for vps servers? Is that based on openvz?