Comment 1 for bug 720707

this is an effect of the following (examples for "write", the same applies for "read")... in the client.py, ThrottlingStorageClient has...

    def write(self, data):
        """Transport API to capture bytes written."""
        if self.factory.client is self:
            self.factory.registerWritten(len(data))
        StorageClient.write(self, data)

...that writes whatever data it got, and just tells the throttler the amount of data written. So, if the limit is X bytes per second, and twisted wants to write 10*X, it just writes that (probably saturating the tcp link), and then the throttler waits 9 seconds more to be below the limit.

The way to fix this is not write the whole amount at once, but mix that with the throttling scheme.