On Thu, May 03, 2018 at 10:55:07AM +0200, Mathias Krause wrote: > struct xfrm_state is rather large (768 bytes here) and therefore wastes > quite a lot of memory as it falls into the kmalloc-1024 slab cache, > leaving 256 bytes of unused memory per XFRM state object -- a net waste > of 25%. > > Using a dedicated slab cache for struct xfrm_state reduces the level of > internal fragmentation to a minimum. > > On my configuration SLUB chooses to create a slab cache covering 4 > pages holding 21 objects, resulting in an average memory waste of ~13 > bytes per object -- a net waste of only 1.6%. > > In my tests this led to memory savings of roughly 2.3MB for 10k XFRM > states. > > Signed-off-by: Mathias Krause <mini...@googlemail.com>
Applied, thanks Mathias!
