I have a Dual CPU Xeon L5420 server<br />
8GB RAM<br />
SSD<br />
HDD<br />
<br />
Any kernel version >7.1 is producing higher than normal ksoftirqd CPU usage, up to <a href="http://bugs.centos.org/view.php?id=8#c30">0000008:0000030</a>% at times.<br />
<br />
<br />
top output:<br />
<br />
<br />
8103 mysql 20 0 5330m 3.1g 6884 S 94.7 40.5 1430:08 mysqld <br />
9 root 20 0 0 0 0 S 23.9 0.0 495:49.30 ksoftirqd/1 <br />
25 root 20 0 0 0 0 S 13.9 0.0 237:24.25 ksoftirqd/5 <br />
25926 nginx 20 0 386m 58m 38m S 4.3 0.7 1:38.91 php-fpm <br />
26677 nginx 20 0 385m 57m 38m S 3.3 0.7 1:34.78 php-fpm <br />
16609 nginx 20 0 394m 63m 44m S 2.7 0.8 2:35.59 php-fpm <br />
25019 nginx 20 0 396m 63m 41m S 2.7 0.8 1:48.12 php-fpm <br />
4 root 20 0 0 0 0 S 1.0 0.0 704:40.21 ksoftirqd/0 <br />
33 root 20 0 0 0 0 S 1.0 0.0 125:50.17 ksoftirqd/7 <br />
7670 varnish 20 0 1556m 316m 268m S 1.0 4.0 14:05.77 varnishd <br />
16713 nginx 20 0 383m 58m 40m S 1.0 0.7 2:36.83 php-fpm <br />
29 root 20 0 0 0 0 S 0.7 0.0 50:45.33 ksoftirqd/6 <br />
6682 nginx 10 -10 36868 7196 800 S 0.7 0.1 13:13.75 nginx <br />
<br />
# uname -r<br />
2.6.32-220.23.1.el6.x86_64<br />
<br />
# lspci<br />
00:00.0 Host bridge: Intel Corporation 5100 Chipset Memory Controller Hub (rev 90)<br />
00:02.0 PCI bridge: Intel Corporation 5100 Chipset PCI Express x8 Port 2-3 (rev 90)<br />
00:04.0 PCI bridge: Intel Corporation 5100 Chipset PCI Express x16 Port 4-7 (rev 90)<br />
00:08.0 System peripheral: Intel Corporation 5100 Chipset DMA Engine (rev 90)<br />
00:10.0 Host bridge: Intel Corporation 5100 Chipset FSB Registers (rev 90)<br />
00:10.1 Host bridge: Intel Corporation 5100 Chipset FSB Registers (rev 90)<br />
00:10.2 Host bridge: Intel Corporation 5100 Chipset FSB Registers (rev 90)<br />
00:11.0 Host bridge: Intel Corporation 5100 Chipset Reserved Registers (rev 90)<br />
00:13.0 Host bridge: Intel Corporation 5100 Chipset Reserved Registers (rev 90)<br />
00:15.0 Host bridge: Intel Corporation 5100 Chipset DDR Channel 0 Registers (rev 90)<br />
00:16.0 Host bridge: Intel Corporation 5100 Chipset DDR Channel 1 Registers (rev 90)<br />
00:1a.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 (rev 02)<br />
00:1a.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller <a href="http://bugs.centos.org/view.php?id=2">0000002</a> (rev 02)<br />
00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1 (rev 02)<br />
00:1c.4 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 5 (rev 02)<br />
00:1c.5 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 6 (rev 02)<br />
00:1d.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller <a href="http://bugs.centos.org/view.php?id=1">0000001</a> (rev 02)<br />
00:1d.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller <a href="http://bugs.centos.org/view.php?id=2">0000002</a> (rev 02)<br />
00:1d.2 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 02)<br />
00:1d.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller <a href="http://bugs.centos.org/view.php?id=1">0000001</a> (rev 02)<br />
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 92)<br />
00:1f.0 ISA bridge: Intel Corporation 82801IR (ICH9R) LPC Interface Controller (rev 02)<br />
00:1f.2 SATA controller: Intel Corporation 82801IR/IO/IH (ICH9R/DO/DH) 6 port SATA Controller [AHCI mode] (rev 02)<br />
00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller (rev 02)<br />
04:00.0 Ethernet controller: Intel Corporation 82573L Gigabit Ethernet Controller<br />
05:00.0 Ethernet controller: Intel Corporation 82573L Gigabit Ethernet Controller<br />
06:01.0 VGA compatible controller: XGI Technology Inc. (eXtreme Graphics Innovation) Z7/Z9 (XG20 core)
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