For the first week that I bought my VPS at Knownhost, I had a VPS M account with an extra 256 MB RAM (384MB RAM total), but the system kept showing kmemsize overloaded. so I had to upgrade my VPS to VPS L +256MB RAM (512MB RAM total). During the past several weeks I've been watching the system RAM usage record and I found actually it had never really exceed 300MB, which means actually I have been spending money for up to 200 MB RAM that the system doesn't really use. I don't know how kmemsize limitation works but it is confusing me. Any suggestions? thanks.