Sorry if this isn't allowed here but I have tried installing <br />
<br />
kernel-3.10.56-11.el6.centos.alt.x86_64<br />
<br />
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. <br />
<br />
Here is a powertop from a 2.6 series server<br />
<br />
Summary: 42492.1 wakeups/second, 0.0 GPU ops/seconds, 0.0 VFS ops/sec and 2422.0% CPU use<br />
<br />
Usage Events/s Category Description<br />
22613 ms/s 23637.4 Process php-fpm: pool www<br />
716.9 ms/s 15783.2 Process nginx: worker process<br />
21.3 ms/s 1096.1 Process /usr/bin/java -Xms200m -Xmx2000m -Xss256k -XX:MaxDirectMemorySize=516m -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -Dage<br />
5.8 ms/s 674.4 Process /usr/sbin/gmond<br />
130.0 ms/s 494.5 Process /usr/bin/redis-server 127.0.0.1:6379<br />
73.2 ms/s 487.4 Process python /usr/bin/statsd-relay.py<br />
3.8 ms/s 82.7 Process java -Xmx6g -server -Dfile.encoding=utf-8 -XX:OnOutOfMemoryError=kill -9 %p -XX:+HeapDumpOnOutOfMemoryError -XX:HeapD<br />
212.4 ms/s 0.00 Interrupt [3] net_rx(softirq)<br />
<br />
<br />
Here it is from 3.10<br />
<br />
<br />
Usage Events/s Category Description<br />
10.2 ms/s 1033.6 Timer hrtimer_wakeup<br />
3.3 ms/s 932.7 Process /usr/bin/java -Xms200m -Xmx2000m -Xss256k<br />
591.1 ms/s 624.3 Process php-fpm: pool www<br />
41.5 ms/s 724.0 Interrupt [3] net_rx(softirq)<br />
<br />
Load pretty much just keeps crawling up to the 500's<br />
<br />
There also is a lot of CPU usage from<br />
<br />
116 root 20 0 0 0 0 R 75.0 0.0 0:04.57 kworker/u66:0<br />
<br />
Which from my understanding handles a lot of the acpi calls that softirq is doing. <br />
<br />
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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