Re: [PATCH net-next] net: allocate skbs on local node

Tom Herbert
2010-10-14T15:31:06Z

> This is all conspicuously hand-wavy and unquantified.  (IOW: prove it!)
>
> The mooted effects should be tested for on both slab and slub, I
> suggest.  They're pretty different beasts.
> --

Some results running netper TCP_RR test with 200 instances, 1 byte
request and response on 16 core AMD using bnx2x with one 16 queues,
one for each CPU.

SLAB

Without patch 553570 tps at 86% CPU
With patch 791883 tps at 93% CPU

SLUB

Without patch 704879 tps at 95% CPU
With patch 775278 tps at 92% CPU

I believe both show good benfits with patch, and it actually looks
like the impact is more pronounced for SLAB. I would also note, that
we have actually already internally patched __netdev_alloc_skb to do
local node allocation which we have been running in production for
quite some time.

Tom