net_sched: sch_fq: change fq_flow size/layout

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sizeof(struct fq_flow) is 112 bytes on 64bit arches.

This means that half of them use two cache lines, but 50% use
three cache lines.

This patch adds cache line alignment, and makes sure that only
the first cache line is touched by fq_enqueue(), which is more
expensive that fq_dequeue() in general.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Eric Dumazet 2020-05-02 19:54:19 -07:00 • committed by David S. Miller

parent dde0a648fc

commit 7ba0537c2b

1 changed files with 7 additions and 2 deletions

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net/sched/sch_fq.c

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