** Also affects: glibc (Ubuntu)
Importance: Undecided
Status: New
** Changed in: glibc
Status: New => Fix Released
** Also affects: glibc (Ubuntu Xenial)
Importance: Undecided
Status: New
** Changed in: glibc (Ubuntu)
Status: New => Fix Released
** Changed in: glibc (Ubuntu Xenial)
Assignee: (unassigned) => Adam Conrad (adconrad)
** Changed in: glibc (Ubuntu Xenial)
Status: New => In Progress
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You received this bug notification because you are a member of नेपाली
भाषा समायोजकहरुको समूह, which is subscribed to Xenial.
Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1812313
Title:
SKX Gold 6129,Platinum 8168 cpu frequency throttling issue during the
benchmark
Status in GLibC:
Fix Released
Status in intel:
Fix Committed
Status in glibc package in Ubuntu:
Fix Released
Status in glibc source package in Xenial:
In Progress
Bug description:
Description:
This is a known issue. Glibc fix is available:
glibc 2.23 branch more than a year ago:
https://sourceware.org/git/?p=glibc.git;a=shortlog;h=refs/heads/release/2.23/master
The specific commit for glibc 2.23 is
https://sourceware.org/git/?p=glibc.git;a=commit;h=26d289bb92b6d1125536644f607c73617463477d
History:
in Ubuntu 16.04.5 ,If the benchmark tools is dynamic linked, and in the
main loop, there are external function call to the dynamic lib, like dhrystone,
whetstone, sysbench… During the benchmark running, CPU core max frequency is
always 2.2Ghz(Gold 6129 , max turbo should be 3.3Ghz). Even the test is single
thread test, we got the same result. In our lab, we found with our Gold 6129
chipset, cpu is always at 1.5Ghz while benchmarking.
In Ubuntu 18.04.1 (glibc 2.27),everything works fine. No freq limit. Try
to upgrade the glibc on Ubuntu 16.04.5 from 2.23 to 2.27, the Gold 6129 works
fine, can reach 3.3Ghz. There is the same issue on Platinum 8168, on Ubuntu
16.04.5(glibc2.23), cpu max frequency during benchmark is about 3Ghz（Platinum
8168 ,1~2 cores max turbo should be 3.7Ghz). Xeon Gold 6129 and Platinum 8168
are major Skylake platform
Target Release: 16.04.5
To manage notifications about this bug go to:
https://bugs.launchpad.net/glibc/+bug/1812313/+subscriptions
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