[CentOS] Adding RAM

Thu Dec 18 17:59:46 UTC 2008
Matt <lm7812 at gmail.com>

> That's why I asked what kind of Controler the board had on it in a previous
> post to you and stated ram was not the suspect problem. IMO if you keeped
> the dual core proc and just switched to ICH7 Board you would have saved
> money. Your utilization rate would probly stayed the same or no higher than
> %30. Just to keep things in balance you will probly want to try the cfq
> schedular with a high user load so every thing gets it fair share in
> time_wait. Some people will contradict that it's about making the users
> happy. When access time for one user takes longer than another then the
> complaints start coming in. I would like to know the Proc Utilization per
> core or are you running it in Single Core?

top - 11:53:39 up 2 days,  9:47,  1 user,  load average: 8.27, 13.66, 29.82
Tasks: 188 total,   1 running, 183 sleeping,   0 stopped,   4 zombie
Cpu0  : 10.6% us,  2.3% sy,  0.0% ni, 87.0% id,  0.0% wa,  0.0% hi,  0.0% si
Cpu1  :  8.0% us,  2.0% sy,  0.0% ni, 88.3% id,  1.7% wa,  0.0% hi,  0.0% si
Cpu2  : 11.6% us,  2.0% sy,  0.0% ni, 86.4% id,  0.0% wa,  0.0% hi,  0.0% si
Cpu3  :  6.0% us,  0.7% sy,  0.0% ni, 92.4% id,  1.0% wa,  0.0% hi,  0.0% si
Mem:   4151316k total,  3438536k used,   712780k free,   428520k buffers
Swap:  2031608k total,        8k used,  2031600k free,  1839452k cached

I do see on occasion CPU load jump up to 30-60% accross the board but
that is rare.  Mostly it looks like above.

I will try switching back too CFQ this evening to see what that does
for 24 hours.  I suspected it was either the SATA controller or the
scheduler that fixed/helped things.  With the quad-core I figure that
at least I will never have to worry about the CPU being a bottle neck.
 I still see the load average jump up at peak times to as much as 60
percent but its a rare event now.  When I did a grep on a 450Mbyte
file it jumped to 90 earlier.