<div dir="ltr"><div><div>Wow, the differences are significant ... <br><br>For a dedicated server, the fix for Meltdown is not really needed, since no one else is accessing RAM by exploiting the speculative execution. <br><br>So I am thinking of pinning the kernel to what it is on those machines.<br><br></div>But there are also headers, generic, ...etc.<br><br></div>Anyone tried that?<br><div><div><br><br></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Jan 10, 2018 at 8:31 AM, L.D. Paniak <span dir="ltr"><<a href="mailto:ldpaniak@fourpisolutions.com" target="_blank">ldpaniak@fourpisolutions.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
Looks like you will see substantial performance impact for I/O-heavy
workloads (especially synthetic ones):<br>
<br>
<a class="m_-8028628289292526798moz-txt-link-freetext" href="https://www.phoronix.com/scan.php?page=news_item&px=KPTI-Retpoline-Combined-Ubuntu" target="_blank">https://www.phoronix.com/scan.<wbr>php?page=news_item&px=KPTI-<wbr>Retpoline-Combined-Ubuntu</a><br>
<br>
The Apache server numbers are especially notable.<div><div class="h5"><br>
<br>
<br>
<div class="m_-8028628289292526798moz-cite-prefix">On 01/09/2018 07:18 PM, doug moen
wrote:<br>
</div>
</div></div><blockquote type="cite"><div><div class="h5">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" target="_blank">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">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>
</div>
</div>
</div>
</blockquote>
<br>
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<br></blockquote></div><br><br clear="all"><br>-- <br><div class="gmail_signature" data-smartmail="gmail_signature">Khalid M. Baheyeldin<br><a href="http://2bits.com" target="_blank">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>
</div>