<div dir="ltr">The hit is mainly for things that do context switches (which IO is the biggest thing in.<br><div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jan 8, 2018 at 1:23 PM, Arman Khalatyan <span dir="ltr"><<a href="mailto:arm2arm@gmail.com" target="_blank">arm2arm@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Ok, We did some tests with the new lustre clients(no patch on servers)<br>
I can confirm like Marek: maximum downgrade is about 40% by rsync with<br>
small files, lfs find on large folders 45% performance penalty:(<br>
We found terrible performance on the test system with zfs+compression+lustre.<br>
Good news: the compute node flops are about 1% or even none. So only<br>
IO intensive applications are impacted.<br>
<br>
Cheers,<br>
Arman.<br>
<div class="HOEnZb"><div class="h5"><br>
On Mon, Jan 8, 2018 at 11:45 AM, Marek MagryĆ <<a href="mailto:m.magrys@cyfronet.pl">m.magrys@cyfronet.pl</a>> wrote:<br>
> Hi all,<br>
><br>
>> I wonder if any performance impacts on lustre with the new security<br>
>> patches for the Intel?<br>
><br>
> According to our initial tests on 3.10.0-693.11.6.el7.x86_64 kernel<br>
> (Centos 7.4) with Lustre 2.10.2, there is a penalty of ca. 10% in nice<br>
> workloads (1MB IO) up to 40% in 4k IOs. Tested with IOR.<br>
><br>
> It looks bad, however probably we don't need to patch the servers, as<br>
> Lustre lives in kernelspace anyway. Some kind of advisory from Intel<br>
> HPDD would be nice here.<br>
><br>
> Cheers,<br>
> Marek<br>
><br>
> --<br>
> Marek Magrys<br>
> ACC Cyfronet AGH-UST<br>
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