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Date:	Tue, 28 Oct 2014 14:46:22 -0500 (CDT)
From:	Christoph Lameter <>
To:	Eric Dumazet <>
cc:	Jesper Dangaard Brouer <>,
	Eric Dumazet <>,
	Alexander Duyck <>,
	Alexei Starovoitov <>,
	Network Development <>
Subject: Re: irq disable in __netdev_alloc_frag() ?

On Mon, 27 Oct 2014, Eric Dumazet wrote:

> Unfortunately, SLUB is more expensive than SLAB for many networking workloads.

hackbench performs better with SLUB.

> The cost of disabling interrupts is pure noise compared to cache line misses.
> SLUB has poor behavior compared to SLAB with alien caches,
> even with the side effect that 'struct page' is 64 bytes aligned
> instead of being 56 bytes with SLAB
> Note that I am not doing SLUB/SLAB tests every day, so it might be
> better nowadays.

Well we did some intensive work on these issues a couple of years ago.

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