I went to whm->server information, got the below information:
Current Memory Usage total used free shared buffers cached
Mem: 504616 413764 90852 0 16400 100300
-/+ buffers/cache: 297064 207552
Swap: 1048784 213452 835332
Total: 1553400 627216 926184
I think 1553400 is the memory on our server, right? BTW, i run "top -c" and find "gzip(backup process)" take most of cpu. How could i fix this problem?