OS freezes - possible high RAM utilization issue

[a_h]

Hi guys!

My system http://pastebin.com/DHjdgzwr keeps freezing after being up for several days. I have not been able to find any useful kernel dump info. While being up for several days system memory looks like this:

Mem: 616M Active, 609M Inact, 719M Wired, 3240K Cache, 622M Buf, 3991M Free
Swap: 4096M Total, 4096M Free

Before freezing, it looks:

Mem: 1249M Active, 3470M Inact, 912M Wired, 58M Cache, 622M Buf, 249M Free
Swap: 4096M Total, 4096M Free

I monitor the server with Zabbix. When free memory (in Zabbix) drops to 200~100Mb, nine times out of ten the server locks up.

I went over http://bit.ly/lQBy5g
My server's

vm.defer_swapspace_pageouts=0

and I don't use swap.

Any suggestions for a newbie?

 

[SirDice]

Check if the hardware itself is fault free. You won't be the first that has bad memory.

 

[a_h]

FreeBSD along with a couple of Windows 2008 DCs, run as VMs on Citrix XenServer. Windows 2008 machines run like champs (which is unusual , FreeBSD does not

 

[tingo]

Well, does XenServer have tools that allow you to look into the health of your VMs? VM logs, that sort of things?
(I only use VirtualBox, so I am not familiar with details of XenServer).
One thing you can try to do, is to boot your FreeBSD machine verbose, and see if there are any suspicious messages in /var/log/messages before the server hangs.

 

[tingo]

More hints:

One: is your virtual FreeBSD machine using SMP (i.e. more than one CPU?). If so, try to adjust it to only one CPU, and see if the freezes disappear.
Two: are the FreeBSD guest additions installed? If not, install them and see if it makes a difference.
Three: are you using ntpd(8)? If so, try disabling it, and see if that removes the freezes.

 

[a_h]

Will try and let you know.