These graphs compare the initial values from the 2011-12-15 kernel (blue) to the current IPv4 (red) and IPv6 (green) values of 2012-04-08 showing improvements.
We can see that in the default case, now with "offload support", the TCP loopback performance was improved. In the case without offloading support we see a regression however. It is not clear where this regression is coming from but clearly needs further investigation and validation.
Comparing to IPv4 we can observe multiple things. The most important is that in the default case with "offload support" we are at equal performance.
In the no offload support case the aforementioned regression is clearly visible. The range of data is once again high, as is the interquartile range (IQR), but has been stabilized a bit. This is a general loopback probelem that should be addressed independently of IPv6.
