Buf Cache is eating my memory

[Robin C. Querol]

My server is rp8400 with 4CPU and 4GB memory. I'm running HPUX 11.11. The system is not running any load but I noticed that I have a 50% utilization on the memory. I checked in glance and found out that the Buf Cache is utilizing 50% of my physical memory. I remember there is a kernel configurable parameter for this. Can you help me refresh my kind. Thanks.

[Jean-Louis Phelix · Accepted solution]

Hi,

Dynamical allocation parameters are dbc_minpct and dbc_maxpct. Leave min to 5 but in your case max shouldn't exceed 20.

Regards.

PS : unfortunaltly, you will have to reboot after kernel regen !

[Jean-Louis Phelix]

hi,

Sorry for typos, it's of course dbc_min_pct and dbc_max_pct.

Regards.

[Robin C. Querol]

Thanks. You are right, I just found my notes.

[Michael Tully]

Unfortunately these setting are placed far to hight when a system is installed. The ideal values are somewhere in between 300-500mb. In your case set the db_max_pct to 10 and the db_min_pct to about 3.

To generate a new kernel.

# cd /stand/build
# /usr/lbin/sysadm/system_prep -s system
Make your changes and save the file
# mk_kernel -s system
# kmupdate
# shutdown -r -y 0

If you are not comfortable this way use 'sam'.

[Jean-Louis Phelix]

Hi,

I've seen that you had never assigned points ... It's kind to do it when someone helped you. :-) ...

Regards.

[Robin C. Querol]

Thanks.