On 01/02/2008 01:53, Jerry Geis wrote:
Hi all,
I used to use centos 4.5 on an AMD 4800+ with 2GIG ram.
Now I use centos 5.1 on AMD 6400+ with 4GIG RAM.
The system responsiveness is different between the two.
I noticed that centos 5.1 seems to be swapping programs out
of memory at times resulting in slowness (perceived by me).
I played with swappiness (/proc/sys/vm/) setting to 10, then 1 then 0.
Still resulted in the same perceived slowness.
Today I did swapoff -a and now the system obviously does not swap
anything out all all. I thought thats what swappiness of 0 would have
done.
Are others experiencing this also? The perceived slowness maks the older
system with less RAM and slower CPU "seem" faster.
Any suggestions on other things to try?
Jerry
Large amounts of swap "in use" does not necessarily reflect a system
that is swapping heavily, and your perceived slowness may have another
cause.
Take a look at the output of "vmstat 10" command's swap columns for real
time or "sar -W" for historical information regarding the number of
pages being swapped in and out. These numbers will give you a much more
accurate picture of how much swapping is occuring on your system.
Cheers
Luke
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