On Tue, 25 Aug 2015, Akshat Kakkar wrote: > As per info in > http://lists.netfilter.org/pipermail/netfilter/2005-September/062859.html, > ipset of iphash of 20Million IPs, takes around only 80MB. I understand > that this might be simply multiplication of 20Million with 4 bytes which > IP takes if stored normally. > > But when I try to replicate this I am getting size in memory as > 506,481,176 (around 483MB) for number of entries 16,581,375. > > This comes to around 30Bytes per IP. > > I have got this values from ipset -L command > > Is this much size anticipated? At that time we had ipset 2.x - now it's 6.x. The algorithm behind the hash types has been completely rewritten since then and memory had been sacrified for the sake of speed. So that number does not apply to the current ipset memory usage. The memory requirement for the hash types depends on the hashsize (H) and the number of elements (N) and it is something like (not counting some basic fixed structures): H * 40byte + (N/4 + N%4) * 4 * element size The RCU support also increased significantly the memory requirement. Best regards, Jozsef - E-mail : kadlec@xxxxxxxxxxxxxxxxx, kadlecsik.jozsef@xxxxxxxxxxxxx GGP key : http://www.kfki.hu/~kadlec/pgp_public_key.txt Address : Wigner Research Centre for Physics, Hungarian Academy of Sciences H-1525 Budapest 114, POB. 49, Hungary -- To unsubscribe from this list: send the line "unsubscribe netfilter" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
