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

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 > _______________________________________________ > lustre-discuss mailing list > lustre-discuss at lists.lustre.org > http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org