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htb: reorder struct htb_class fields for performance
authorEric Dumazet <edumazet@google.com>
Thu, 13 Jun 2013 14:58:30 +0000 (07:58 -0700)
committerDavid S. Miller <davem@davemloft.net>
Fri, 14 Jun 2013 00:17:02 +0000 (17:17 -0700)
commitca4ec90b31d1ecf01087c607933cf792057bc8bf
treef629cdb10f0eafc1b1979daf34698db1d90a08fbtree | snapshot
parent5f121b9a83b499a61ed44e5ba619c7de8f7271adcommit | diff
htb: reorder struct htb_class fields for performance

htb_class structures are big, and source of false sharing on SMP.

By carefully splitting them in two parts, we can improve performance.

I got 9 % performance increase on a 24 threads machine, with 200
concurrent netperf in TCP_RR mode, using a HTB hierarchy of 4 classes.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/sched/sch_htb.c diff | blob | history
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