[Moin-user] performance of moinmoin.wikiwikiweb.de

Thomas Waldmann tw-public at gmx.de
Wed Feb 15 02:53:02 EST 2006

> I get a terrible performance of the wiki moinmoin.wikiwikiweb.de, same
> with linuxwiki.org

Both are run by the same server and process.

> The traceroutes are looking good. Is this due to heavy CPU load?

Load was often between 5 and 10 the last days.

Partly caused by high bot traffic and a good amount added by some 
chinese sucker running a leech tool with a faked user agent = "IE 5.0 / 

Normally bots and leech tools are 403-denied doing "action=...", but as 
this one could not be recognized, it put a high load on the system by 
triggering lots of silly stuff (action=fullsearch, info, edit, print, 
recall,...) over a long time (and the rate limits of some of this stuff 
PER ACTION is rather high).

I meanwhile put this guy into hosts_deny, so he doesnt get any content 
any more.

While trying to counter the attack, I tried some other things, like 
letting such people wait (was ineffective (multi-threaded leechtool?) 
and lead to other problems, maybe running out of threads or some other 

I also added improved surge protection, now having a total request 
counter ("all"), so that misbehaved bots and leechers now run faster 
into surge protection (and stay there) while normal users usually 
shouldn't get problems.

More information about the Moin-user mailing list