From: Florian Westphal <fw@strlen.de>
To: <netfilter-devel@vger.kernel.org>
Subject: [PATCH v3 nf-next 0/3] netfilter: x_tables: pack percpu counter allocations
Date: Tue, 22 Nov 2016 14:44:16 +0100 [thread overview]
Message-ID: <1479822259-28786-1-git-send-email-fw@strlen.de> (raw)
... to speed up iptables(-restore) calls.
Especially a pattern like
for i in $(seq 1 1000) ; iptables -A FORWARD ;done
is expensive, because adding the rule doubles the percpu counters (allocate
2nd blob, then free old one, including its percpu counters).
This causes frequent expansion and shrinking of percpu memory pool.
This change batches calls to the allocator by packing multiple counters
in 4k memory chunks.
Heavily based on suggestions from Eric Dumazet.
The only change in v3 is in patch #2 which assigned garbage on UP
(was fixed by next patch, but better to not do it in first place).
next reply other threads:[~2016-11-22 13:44 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-22 13:44 Florian Westphal [this message]
2016-11-22 13:44 ` [PATCH v3 nf-next 1/3] netfilter: x_tables: pass xt_counters struct instead of packet counter Florian Westphal
2016-11-22 13:44 ` [PATCH v3 nf-next 2/3] netfilter: x_tables: pass xt_counters struct to counter allocator Florian Westphal
2016-11-22 13:44 ` [PATCH v3 nf-next 3/3] netfilter: x_tables: pack percpu counter allocations Florian Westphal
2016-12-04 20:09 ` [PATCH v3 nf-next 0/3] " Pablo Neira Ayuso
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