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Bug 1772307 - glibc: Measured performance loss in lmbench for bcopy on Haswell processor
Summary: glibc: Measured performance loss in lmbench for bcopy on Haswell processor
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: glibc
Version: 7.7
Hardware: x86_64
OS: Linux
unspecified
low
Target Milestone: rc
: ---
Assignee: DJ Delorie
QA Contact: qe-baseos-tools-bugs
URL:
Whiteboard:
Depends On:
Blocks: 1782203
TreeView+ depends on / blocked
 
Reported: 2019-11-14 05:06 UTC by Takayuki Nagata
Modified: 2023-12-15 16:56 UTC (History)
8 users (show)

Fixed In Version: glibc-2.17-311.el7
Doc Type: No Doc Update
Doc Text:
Clone Of:
Environment:
Last Closed: 2020-09-29 19:20:26 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Knowledge Base (Solution) 4585071 0 None None None 2019-11-14 05:39:33 UTC
Red Hat Product Errata RHSA-2020:3861 0 None None None 2020-09-29 19:21:09 UTC

Comment 26 errata-xmlrpc 2020-09-29 19:20:26 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Low: glibc security, bug fix, and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2020:3861
Comment 27 xuchunmei 2020-10-21 06:43:54 UTC 
with the patch "https://sourceware.org/git/?p=glibc.git;h=27d3ce1467990f89126e228559dec8f84b96c60e", the ebizzy benchmark has a regression.
test with glibc-2.17-317, which has include the commit, the data of ebizzy is:
# ./ebizzy -t 1 -S 10
4561 records/s 4561
real 10.00 s
user 10.00 s
sys   0.00 s

then revert the commit from glibc-2.17-317, rebuild glibc, the data of ebizzy is:
# ./ebizzy -t 1 -S 10
7188 records/s 7188
real 10.00 s
user 10.00 s
sys   0.00 s

cpuinfo:
lscpu
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                8
On-line CPU(s) list:   0-7
Thread(s) per core:    2
Core(s) per socket:    2
Socket(s):             2
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 45
Model name:            Intel(R) Xeon(R) CPU E5-2430 0 @ 2.20GHz
Stepping:              7
CPU MHz:               2194.710
BogoMIPS:              4389.42
Hypervisor vendor:     KVM
Virtualization type:   full
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              15360K
NUMA node0 CPU(s):     0-7
Flags:                 fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc rep_good nopl cpuid tsc_known_freq pni pclmulqdq ssse3 cx16 pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx hypervisor lahf_lm pti ibrs ibpb tsc_adjust xsaveopt
Comment 28 Florian Weimer 2020-10-21 06:46:33 UTC 
(In reply to xuchunmei from comment #27)
> with the patch
> "https://sourceware.org/git/?p=glibc.git;
> h=27d3ce1467990f89126e228559dec8f84b96c60e", the ebizzy benchmark has a
> regression.

Would you please file a new bug for this? Thanks.
Comment 29 xuchunmei 2020-10-21 06:53:46 UTC 
(In reply to Florian Weimer from comment #28)
> (In reply to xuchunmei from comment #27)
> > with the patch
> > "https://sourceware.org/git/?p=glibc.git;
> > h=27d3ce1467990f89126e228559dec8f84b96c60e", the ebizzy benchmark has a
> > regression.
> 
> Would you please file a new bug for this? Thanks.


https://bugzilla.redhat.com/show_bug.cgi?id=1889977
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