random latency in named

Mathew Ian Eis Mathew.Eis at nau.edu
Fri May 22 18:33:58 UTC 2015

-----Original Message-----
From: Tony Finch <dot at dotat.at>
Date: Friday, May 22, 2015 at 2:32 AM
To: Mathew Eis <mathew.eis at nau.edu>
Cc: "bind-users at lists.isc.org" <bind-users at lists.isc.org>
Subject: Re: random latency in named

>Mathew Ian Eis <Mathew.Eis at 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.

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):



Mathew Eis
Northern Arizona University
Information Technology Services

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