What's the boost pool allocator good for?

  I tested the speed of a simple program like this:

//------------------------------------------------------------
#include <list>
#include <boost/pool/pool_alloc.hpp>

int main()
{
    typedef std::list<int> List_t; // default allocator
    //typedef std::list<int, boost::pool_allocator<int> > List_t;

    List_t l;

    for(int i = 0; i < 100000; ++i)
        l.push_back(i);

    int counter = 0;
    for(List_t::iterator iter = l.begin(); iter != l.end();)
        if(++counter % 3 == 0)
            iter = l.erase(iter);
        else
            ++iter;

    for(int i = 0; i < 100000; ++i)
        l.push_back(i);
}
//------------------------------------------------------------

  Compiling this with "-O3 -march=pentium4" and running it in my
computer, the running time was approximately 33 milliseconds.

  When I change to the version of the list which uses the boost pool
allocator and do the same thing, the running time is a whopping 59
seconds. That's approximately 1800 times slower.

  What the heck is this pool allocator good for? At least not for speed.