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Message-ID: <20141113162124.5170b82d@uryu.home.lan>
Date: Thu, 13 Nov 2014 16:21:24 -0500
From: Stephen Hemminger <stephen@...workplumber.org>
To: netdev@...r.kernel.org
Subject: Fw: [Bug 88161] New: High traffic causes a lot of softirqs
Begin forwarded message:
Date: Thu, 13 Nov 2014 06:18:28 -0800
From: "bugzilla-daemon@...zilla.kernel.org" <bugzilla-daemon@...zilla.kernel.org>
To: "stephen@...workplumber.org" <stephen@...workplumber.org>
Subject: [Bug 88161] New: High traffic causes a lot of softirqs
https://bugzilla.kernel.org/show_bug.cgi?id=88161
Bug ID: 88161
Summary: High traffic causes a lot of softirqs
Product: Networking
Version: 2.5
Kernel Version: 3.17.2
Hardware: Intel
OS: Linux
Tree: Mainline
Status: NEW
Severity: high
Priority: P1
Component: Other
Assignee: shemminger@...ux-foundation.org
Reporter: mike@...ntric.com
Regression: No
I'm using packaged rpms by centos and elrepo with the same results and I can
replicate this on any server in our cluster.
I have tried installing
kernel-3.10.56-11.el6.centos.alt.x86_64
Also currently running
[root@...125-east.domain.com /var/www/html]# uname -a
Linux web125-east.domain.com 3.17.2-1.el6.elrepo.x86_64 #1 SMP Fri Oct 31
10:37:44 EDT 2014 x86_64 x86_64 x86_64 GNU/Linux
from the centosplus repo to solve a problem where 2.6 was locking up process
tree on high cpu and it fixed it but it introduced another issue where we have
a lot of softirq requests when under a lot of traffic load.
Here is a powertop from a 2.6 series server
Summary: 42492.1 wakeups/second, 0.0 GPU ops/seconds, 0.0 VFS ops/sec and
2422.0% CPU use
Usage Events/s Category Description
22613 ms/s 23637.4 Process php-fpm: pool www
716.9 ms/s 15783.2 Process nginx: worker process
21.3 ms/s 1096.1 Process /usr/bin/java -Xms200m -Xmx2000m
-Xss256k -XX:MaxDirectMemorySize=516m -XX:+UseParNewGC -XX:+UseConcMarkSweepGC
-Dage
5.8 ms/s 674.4 Process /usr/sbin/gmond
130.0 ms/s 494.5 Process /usr/bin/redis-server 127.0.0.1:6379
73.2 ms/s 487.4 Process python /usr/bin/statsd-relay.py
3.8 ms/s 82.7 Process java -Xmx6g -server -Dfile.encoding=utf-8
-XX:OnOutOfMemoryError=kill -9 %p -XX:+HeapDumpOnOutOfMemoryError -XX:HeapD
212.4 ms/s 0.00 Interrupt [3] net_rx(softirq)
Here it is from 3.10
Usage Events/s Category Description
10.2 ms/s 1033.6 Timer hrtimer_wakeup
3.3 ms/s 932.7 Process /usr/bin/java -Xms200m -Xmx2000m -Xss256k
591.1 ms/s 624.3 Process php-fpm: pool www
41.5 ms/s 724.0 Interrupt [3] net_rx(softirq)
Load pretty much just keeps crawling up to the 500's
There also is a lot of CPU usage from
116 root 20 0 0 0 0 R 75.0 0.0 0:04.57 kworker/u66:0
Which from my understanding handles a lot of the acpi calls that softirq is
doing.
I've tried many other 3.x kernels above 3.10 with the same results.. so I'm
wondering if this is a known issue
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