netdev - Re: [PATCH 1/2] mm/page_alloc: free order-0 pages through PCP in page_frag

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Message-ID: <6edcec1a-eefa-7861-1af4-cdf7fa45184c@gmail.com>
Date:   Mon, 12 Nov 2018 07:44:18 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Alexander Duyck <alexander.duyck@...il.com>,
        Paweł Staszewski <pstaszewski@...are.pl>
Cc:     aaron.lu@...el.com, linux-mm <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Netdev <netdev@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Tariq Toukan <tariqt@...lanox.com>,
        ilias.apalodimas@...aro.org, yoel@...knet.dk,
        Mel Gorman <mgorman@...hsingularity.net>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Michal Hocko <mhocko@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>, dave.hansen@...ux.intel.com
Subject: Re: [PATCH 1/2] mm/page_alloc: free order-0 pages through PCP in
 page_frag_free()



On 11/12/2018 07:30 AM, Alexander Duyck wrote:

> It sounds to me like XDP would probably be your best bet. With that
> you could probably get away with smaller ring sizes, higher interrupt
> rates, and get the advantage of it batching the Tx without having to
> drop packets.

Add to this that with XDP (or anything lowering per packet processing costs)
you can reduce number of cpus/queues, get better latencies, and bigger TX batches.