That's strange. I never encounter such issue with my current hosting company even with the previous ones I had.

Can you tell us the version of B2evo you are using?
What specific script is impacting the load of the server?

I am using 5.0.5-stable released on 08/02/13

I've attached the info I was sent by the hosting company. I am not sure what any of this means, as I am not versed in the script.

• inf.txt (22 KB)

Do you usually have many visitors ? First, empty evo_sessions table (dont worry it's safe, just previously logged in users will have to re-login).
Try to repair all your tables just in case.
PS: you might want to check the frequency between the requests of that repeating IP (58.254.168.73), someone might be trying to do something offensive (ddos, port scan, scraping whatever.)
I suggest you install a firewall on your server to prevent any of that kind in the future

Usually I have very few visitors (1 or 2), and then occasionally the visitors will spike to 300 or something.
I have tried banning the repeating IPs that show up, but another repeating IP eventually shows up in its place. I suspect, as you say, it is someone trying something unsavory. I will attempt to empty evo_sessions, repair the tables, and install a firewall. Thank you for the suggestions.

Spammers hitting your site like crazy are always a problem of course and are similar to a DoS attack. Your host my guard itself against that by limiting the number of requests from the same IP that come through.

In cases like this I am always interested in knowing which hosting company we are talking about?

On a related note, it might be worth trying to switch the sessions table from MyISAM to InnoDB, to avoid table locks.
http://b2evolution.net/man/advanced-topics/performance/myisam-vs-innodb

Thank you for responding directly, fplanque!

My hosting company is HostGator. They say they are supposed to have a firewall up for virtual hosted accounts like mine, but it doesn't seem to be doing its job.

I will look into implementing your suggestion about table locks. Thank you!

Since i have my dedicated server, i configure my firewall as i like, and it usually does the trick by automatically banning single IP one at a time.
But sometimes i get bored seeing same ip range over and over trying to penetrate so i block them in mass. (It's not the best practice and i try to avoid doing that but in rare cases those China guys gets really annoying.)
Even if you cannot configure your servers firewall, you can still use .htaccess to block them i suppose. You can make use of the tool available at: http://ip2cidr.com/ or similar if you are unfamiliar with blocking IP ranges.

My cpanel access allows me database access, the ability to ban IPs, and a variety of other features with which I'm not too familiar, but the problem is I don't receive notification that one of these 'attacks' is occurring. I only receive notification after the hosting company has already blocked access to the script due to overload.