Classroom sizes. Should they increase?

Having large classes can present numerous problems. For one there is usually only one teacher teaching the class. That teacher has to be able to balance the appointed time in class to see to all the students. Most classes only have a certain time period and with large classes the teachers often aren't able to see every student. I have been to a couple of different schools over the years and one thing i have noticed is that the teachers usually have to spend the majority of their time trying to clam the disruptive students who don't particularly want to be in class. At one of my high schools in particular there was only a very small amount of year 9s and so there were only three classes all roughly around 25-30 students. Many of the students were disruptive and liked to muck around. The noise often got so bad that some of the more dedicated and series students had trouble being heard. The teachers were put under a lot of stress having to teach classes that were almost uncontrollable. If the classes had been smaller or split into half I think the situation would have been different.
One of my year 9 electives was drama. It was a great subject and the class had only 11 students. I found it was much easier to participate in class. I didn't have to shout to get the teachers attention, and the teacher was able to come around and see each of the students throughout the lesson to make sure we were all on the same page.
Maybe with some schools having large classes work but in my experience large classes have never worked out.