On Mon, Jul 27, 2009 at 11:25, Eric Dumazet[off-list ref] wrote:

Well, ip_vs_conn_cache uses SLAB_HWCACHE_ALIGN, so this should be rounded up
to L1 cache size. Or add "at least" like in line 1080
of net/netfilter/ipvs/ip_vs_conn.c :

IP_VS_DBG(0, "Each connection entry needs %Zd bytes at least\n",
          sizeof(struct ip_vs_conn));

Good point.  Is there an easy way to figure out how much memory is
wasted for alignment by the slab allocator?  Otherwise I vote for the
"at least" approach.

-Hannes