netdev - Re: [PATCH v3 net-next 08/14] mlx4: use order-0 pages for RX

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Message-ID: <CANn89iJayq1r2hLQJSHA1YvZGDOxNuViucf=+syL6BEmFkc2RQ@mail.gmail.com>
Date:   Thu, 16 Feb 2017 09:11:01 -0800
From:   Eric Dumazet <edumazet@...gle.com>
To:     Tom Herbert <tom@...bertland.com>
Cc:     Tariq Toukan <tariqt@...lanox.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Alexander Duyck <alexander.duyck@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>, Martin KaFai Lau <kafai@...com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Brenden Blanco <bblanco@...mgrid.com>,
        Alexei Starovoitov <ast@...nel.org>,
        linux-mm <linux-mm@...ck.org>
Subject: Re: [PATCH v3 net-next 08/14] mlx4: use order-0 pages for RX

> You're admitting that Eric's patches improve driver quality,
> stability, and performance but you're not allowing this in the kernel
> because "we know what benchmarks our customers are going to run".

Note that I do not particularly care if these patches go in 4.11 or 4.12 really.

I already backported them into our 4.3 based kernel.

I guess that we could at least propose the trivial patch for stable releases,
since PowerPC arches really need it.

diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
index cec59bc264c9ac197048fd7c98bcd5cf25de0efd..0f6d2f3b7d54f51de359d4ccde21f4585e6b7852
100644
--- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
+++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
@@ -102,7 +102,8 @@
 /* Use the maximum between 16384 and a single page */
 #define MLX4_EN_ALLOC_SIZE     PAGE_ALIGN(16384)

-#define MLX4_EN_ALLOC_PREFER_ORDER     PAGE_ALLOC_COSTLY_ORDER
+#define MLX4_EN_ALLOC_PREFER_ORDER min_t(int, get_order(32768),
         \
+                                        PAGE_ALLOC_COSTLY_ORDER)

 /* Receive fragment sizes; we use at most 3 fragments (for 9600 byte MTU
  * and 4K allocations) */