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Looks like you will see substantial performance impact for I/O-heavy
workloads (especially synthetic ones):<br>
<br>
<a class="moz-txt-link-freetext" href="https://www.phoronix.com/scan.php?page=news_item&px=KPTI-Retpoline-Combined-Ubuntu">https://www.phoronix.com/scan.php?page=news_item&px=KPTI-Retpoline-Combined-Ubuntu</a><br>
<br>
The Apache server numbers are especially notable.<br>
<br>
<br>
<div class="moz-cite-prefix">On 01/09/2018 07:18 PM, doug moen
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAGV6i+MLP+ZDAKY_6O2A8AqUm=XX6EtFf8SYoxPAgJLhxUqKEQ@mail.gmail.com">According
to what I read, the performance impact occurs if you are hammering
the kernel with a lot of system calls. Eg, a server that is
performing a lot of I/o.<br>
<br>
On Tuesday, 9 January 2018, Khalid Baheyeldin <<a
href="mailto:kb@2bits.com" moz-do-not-send="true">kb@2bits.com</a>>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">
<div>
<div>I just received the email for the meltdown patch for
Ubuntu Linux.<br>
<br>
CVE-2017-5754<br>
<br>
There are two concerns:<br>
<br>
</div>
1. Performance impact.<br>
<br>
</div>
2. This comment in the email:<br>
<br>
<div>
<div>"ATTENTION: Due to an unavoidable ABI change the kernel
updates have<br>
been given a new version number, which requires you to
recompile and<br>
reinstall all third party kernel modules you might have
installed.<br>
Unless you manually uninstalled the standard kernel
metapackages<br>
(e.g. linux-generic, linux-generic-lts-RELEASE,
linux-virtual,<br>
linux-powerpc), a standard system upgrade will
automatically perform<br>
this as well."<br>
<br>
</div>
<div>Anyone updated to this fix yet?<br>
</div>
<div>Any noticeable negative impact on performance?<br>
<br>
-- <br>
<div>Khalid M. Baheyeldin<br>
<a href="http://2bits.com" target="_blank"
moz-do-not-send="true">2bits.com</a>, Inc.<br>
Fast Reliable Drupal<br>
Drupal optimization, development, customization and
consulting.<br>
Simplicity is prerequisite for reliability. -- Edsger
W.Dijkstra<br>
Simplicity is the ultimate sophistication. -- Leonardo
da Vinci<br>
For every complex problem, there is an answer that is
clear, simple, and wrong." -- H.L. Mencken<br>
</div>
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</blockquote>
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