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authorEric Dumazet <eric.dumazet@gmail.com>2013-06-23 08:17:56 -0700
committerDavid S. Miller <davem@davemloft.net>2013-06-25 16:18:31 -0700
commit51151a16a60f0a886a0b1e4a0697001198af50c4 (patch)
treea0d10152e3439e60cd8e67b2f66be0bbde0845fd /include
parent3bae9db9aacc40cdb5a0a4b74aaf935b3e85b4d6 (diff)
mlx4: allow order-0 memory allocations in RX path
Signed-off-by: Eric Dumazet <edumazet@google.com> mlx4 exclusively uses order-2 allocations in RX path, which are likely to fail under memory pressure. We therefore drop frames more than needed. This patch tries order-3, order-2, order-1 and finally order-0 allocations to keep good performance, yet allow allocations if/when memory gets fragmented. By using larger pages, and avoiding unnecessary get_page()/put_page() on compound pages, this patch improves performance as well, lowering false sharing on struct page. Also use GFP_KERNEL allocations in initialization path, as allocating 12 MB (390 order-3 pages) can easily fail with GFP_ATOMIC. Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Amir Vadai <amirv@mellanox.com> Acked-by: Or Gerlitz <ogerlitz@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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