<div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif">Has anyone else measured the performance of newer kernels vs the default?<br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">Any comment is welcome.<br></div></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><font face="tahoma,sans-serif">Regards,<br>Mahmood</font><br><br><br></div></div></div>
<br><div class="gmail_quote">On Sun, Feb 11, 2018 at 6:14 PM, Mahmood Naderan <span dir="ltr"><<a href="mailto:mahmood.nt@gmail.com" target="_blank">mahmood.nt@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif">Hi,<br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">I am using a Centos 7 where the default kernel version is 3.10. I have installed that on a VirtualBox as a test system. Then I decided to upgrade the kernel to 4.15 with the elrepo packages.<br><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">With the NAS parallel benchmark suite, I have noticed some performance degradation. The runtime is about one minute longer with 4.15. I know that this using VirtualBox is not a good infrastructure for performance measurements, but may be can be used as a hint.<br><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">See the results below<br><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">Kernel-3.10<br> bt.C.4 => 698.12 sec<br> ep.D.4 => 2561.44 sec<br> cg.C.2 => 187.96 sec<br> ft.C.2 => 288.49 sec<br> ft.C.4 => 160.72 sec<br> lu.C.4 => 541.46 sec<br> lu.D.4 => 12705.02 sec<br><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">Kernel-4.15<br> bt.C.4 => 746.17 sec<br> ep.D.4 => 2510.52 sec<br> cg.C.2 => 209.17 sec<br> ft.C.2 => 284.43 sec<br> ft.C.4 => 155.67 sec<br> lu.C.4 => 646.67 sec<br> lu.D.4 => 16930.73 sec<br><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">Any idea?<br><br clear="all"></div><div><div class="m_7936434690526161285gmail_signature"><div dir="ltr"><font face="tahoma,sans-serif">Regards,<br>Mahmood</font><br><br><br></div></div></div>
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