/proc/slab_allocatos

Hello everyone, what is the meaning of the number 578 (in this case) in the output of /proc/slab_allocatos root@drgos:~# cat /proc/slab_allocators | grep skb skbuff_head_cache: 578 __alloc_skb+0x38/0x114 root@drgos:~# Are those bytes, Kbytes, or am I completely wrong ? Best Regards, Pietro.