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  <div class="section" id="skiboot-5-1-4">
<h1>skiboot-5.1.4<a class="headerlink" href="#skiboot-5-1-4" title="Permalink to this headline"></a></h1>
<p>skiboot-5.1.4 was released on September 26th, 2015.</p>
<p>skiboot-5.1.4 is the 5th stable release of 5.1, it follows skiboot-5.1.3
(which was released September 15th, 2015).</p>
<p>Skiboot 5.1.4 contains all fixes from skiboot-5.1.3 and is an important bug
fix release and a strongly recommended update from any prior skiboot-5.1.x
release.</p>
<div class="section" id="changes">
<h2>Changes<a class="headerlink" href="#changes" title="Permalink to this headline"></a></h2>
<p>Over skiboot-5.1.3, we have the following changes:</p>
<ul>
<li><p class="first">Rate limit OPAL_MSG_OCC to only one outstanding message to host</p>
<p>In the event of a lot of OCC events (or many CPU cores), we could
send many OCC messages to the host, which if it wasn’t calling
opal_get_msg really often, would cause skiboot to malloc() additional
messages until we ran out of skiboot heap and things didn’t end up
being much fun.</p>
<p>When running certain hardware exercisers, they seem to steal all time
from Linux being able to call opal_get_msg, causing these to queue up
and get “opalmsg: No available node in the free list, allocating” warnings
followed by tonnes of backtraces of failing memory allocations.</p>
</li>
<li><p class="first">Ensure reserved memory ranges are exposed correctly to host
(fix corrupted SLW image)</p>
<p>We seem to have not hit this on ASTBMC based  OpenPower machines, but was
certainly hit on FSP based machines</p>
</li>
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