[lustre-discuss] Are there any performance hits with the https://access.redhat.com/security/vulnerabilities/speculativeexecution?

[Arman Khalatyan]

Ok, We did some tests with the new lustre clients(no patch on servers)
I can confirm like Marek: maximum downgrade is about 40% by rsync with
small files, lfs find on large folders 45% performance penalty:(
We found terrible performance on the test system with zfs+compression+lustre.
Good news: the compute node flops are about 1% or even none. So only
IO intensive applications are impacted.

Cheers,
Arman.

On Mon, Jan 8, 2018 at 11:45 AM, Marek Magryś <m.magrys at cyfronet.pl> wrote:
> Hi all,
>
>> I wonder if any performance impacts on lustre with the new security
>> patches for the Intel?
>
> According to our initial tests on 3.10.0-693.11.6.el7.x86_64 kernel
> (Centos 7.4) with Lustre 2.10.2, there is a penalty of ca. 10% in nice
> workloads (1MB IO) up to 40% in 4k IOs. Tested with IOR.
>
> It looks bad, however probably we don't need to patch the servers, as
> Lustre lives in kernelspace anyway. Some kind of advisory from Intel
> HPDD would be nice here.
>
> Cheers,
> Marek
>
> --
> Marek Magrys
> ACC Cyfronet AGH-UST
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