FWIW as another data point we've seen the same in the wild across RHEL/CentOS 5.x and 6.x on "large" (32 core) Xeon based servers (E5-2650's), including 6.6 with the 2.6.32-504.16.2.el6.x86_64 kernel. Observed while debugging other things, and haven't had time to follow up.
-----Original Message----- From: Mathew Ian Eis <mathew....@nau.edu> Date: Friday, May 22, 2015 at 11:33 AM To: "bind-users@lists.isc.org" <bind-users@lists.isc.org> Cc: Tony Finch <d...@dotat.at> Subject: Re: random latency in named > >-----Original Message----- >From: Tony Finch <d...@dotat.at> >Date: Friday, May 22, 2015 at 2:32 AM >To: Mathew Eis <mathew....@nau.edu> >Cc: "bind-users@lists.isc.org" <bind-users@lists.isc.org> >Subject: Re: random latency in named > >>Mathew Ian Eis <mathew....@nau.edu> wrote: >>> >>> * The OS is RHEL 6.6; we just updated the kernel to >>> 2.6.32-504.16.2.el6.x86_64, also with no effect. >> >>Is your server using a Haswell CPU? If so it might be the lost futex >>wakeup bug discussed at the links below, in which case the problem might >>go away if you upgrade to RHEL 6.6.z. >> >>https://groups.google.com/forum/#!topic/mechanical-sympathy/QbmpZxp6C64 >>https://news.ycombinator.com/item?id=9542548 > >Nope, AMD here, but that probably wouldn¹t rule it out. I think I have a >comment somewhere on that HN thread... It looks like the futex bug >probably affects all architectures; just some more than others, as the >actual kernel patch references ARM. > >Anyhow, I wish it had been that, but the 2.6.32-504.16.2.el6.x86_64 kernel >didn¹t fix the issue. > >(6.6 2.6.32-504.16.2.el6.x86_64 kernel is the 6.6.z one): >https://rhn.redhat.com/errata/rhel-server-6.6-errata.html > >https://rhn.redhat.com/errata/RHSA-2015-0864.html > > >Thanks, > >Mathew Eis >Northern Arizona University >Information Technology Services > >_______________________________________________ >Please visit https://lists.isc.org/mailman/listinfo/bind-users to >unsubscribe from this list > >bind-users mailing list >bind-users@lists.isc.org >https://lists.isc.org/mailman/listinfo/bind-users _______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
