linux-kernel - [3.10.22+][3.12][performance regression] - huge softirq increase on netfilter

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Date:	Wed, 11 Dec 2013 14:01:29 +0200
From:	Nikolay Ulyanitsky <lystor@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: [3.10.22+][3.12][performance regression] - huge softirq increase on netfilter

Hello


3.10.22 has new 2 patches that increase softirq from 0.0% to 15.0% in
comparison with 3.10.21 on my software routers:

78ab8cb      netfilter: nf_conntrack: use RCU safe kfree for conntrack
extensions
873be93      ipc/sem.c: synchronize semop and semctl with IPC_RMID


Screenshots:
Server1 (ipt_NETFLOW):     http://s12.postimg.org/5eprc03tp/vega.png
Server2 (NAT):    http://s27.postimg.org/swj3he8dv/mimosa.png


Server1:
3.10.21: softirq = 0%
3.10.22+, 3.12.4: softirq = 15%
3.10.22+, 3.12.4 WITHOUT 78ab8cb, WITH 873be93: softirq = 1%
3.10.22+, 3.12.4 WITHOUT 78ab8cb, WITHOUT 873be93: softirq = 0%


Hardware:
2 x Xeon 3.2GHz, Intel SE7520, 4 x Intel 82576 Gigabit Network

CentOS 6.5 x86_64


Kernel configs:
3.12.4: http://pastebin.com/ugTWFeJg
3.10.22: http://pastebin.com/N8z4UAV5


Please fix/revert these patches.


Thanks


–

With best regards,

Nikolay Ulyanitsky
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