netdev - Re: [PATCH net 2/3] rhashtable: better high order allocation attempts

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Date:	Fri, 20 Feb 2015 06:58:30 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"tgraf@...g.ch" <tgraf@...g.ch>
Cc:	David Laight <David.Laight@...LAB.COM>,
	'Daniel Borkmann' <daniel@...earbox.net>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"johunt@...mai.com" <johunt@...mai.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net 2/3] rhashtable: better high order allocation
 attempts

On Fri, 2015-02-20 at 14:31 +0000, tgraf@...g.ch wrote:

> We can consider switching over to flex arrays at some point
> although NUMA considerations seem much more important to me
> at this point.

flex arrays add a performance cost, much higher than TLB misses of
vmalloc()

I mentioned in the past that vmalloc() could be using hugepages
eventually, so even this TLB cost could be lowered if wanted.


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