People say China miners must mine at China pool and this is not true, GFW increase latency not blocking any well known bitcoin ports e.g. 3333, 8333, 9332, 9333 etc.
People (indeed li said) i mine at pools outside China causing problems and this is not true at all, i'm connecting Slush pool via their CN node that is 100% China pool.
I'm a CxIE with 20xxx number I know internet well, you people always been misled by the Chinese, GFW is simply a hardware firewall with deep packet inspection functionality that's all.