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<div class="moz-cite-prefix">Btw, the reason technologies like
Intel's Hyperthreading and AMD's “Clustered Multi-Threading”
result in improved performance for typical IO heavy multi-threaded
workloads is entirely because of this effect. Since most of the
threads are stalled most of the time due to cache misses or
waiting on IO, threads that are actually busy can make use of all
available execution units. I suspect if you disabled
HyperThreading for your SEPTUN build you would get similar or
possibly better performance, as Hyperthreading can actually impact
performance if both threads are attempting to make use of all
available execution units. <br>
<br>
-Coop<span style="color: rgb(51, 51, 51); font-family: q_serif,
Georgia, Times, "Times New Roman", "Hiragino Kaku
Gothic Pro", Meiryo, serif; font-size: 16px; font-style:
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float: none;"><span></span></span><br>
<br>
On 3/4/2018 11:31 PM, Michał Purzyński wrote:<br>
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<blockquote type="cite"
cite="mid:CAJ6bFK27etRX_bYKhV5xW-9vc9MK2CJZs0BRE6LoyGFCHmBH=A@mail.gmail.com">
<pre wrap="">That's
nice, but those aren't even close to being saturated, as we're wasting
cycles waiting for cache misses :/
</pre>
</blockquote>
<pre class="moz-signature" cols="72">--
Cooper Nelson
Network Security Analyst
UCSD ITS Security Team
<a class="moz-txt-link-abbreviated" href="mailto:cnelson@ucsd.edu">cnelson@ucsd.edu</a> x41042</pre>
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