Delay-pools (class2) limit more than specified

[Jose Lopes <jlopes@xxxxxxxxxxxxxx>]

Hi,

I'm  using delay pools to limit bandwidth.
My version of squid is "Squid Cache: Version 3.1.0.15".

My configs are:

delay_pools 2
delay_access 1 allow client_hosts1
delay_access 1 deny all
delay_class 1 2
delay_parameters 1 131072/131072 65536/65536

delay_access 2 allow client_hosts2
delay_access 2 deny all
delay_class 2 1
delay_parameters 2 131072/131072

Delay_pool 2 works well, one host at client_hosts2 downloads at ~130KB/s .
At delay_pool 1, with one host downloading, it download's at ~33KB/s .
At delay_pool 1, with all hosts (client_hosts1) downloading, the global max value of download is ~66KB/s.

Seems like delay_pool of class 2 limit at half of the bandwidth specified.

How do I sort out this problem?

Thanks in advance.
Regards
Jose Lopes