| 2018-10-11 09:09:00 |
Paul Stephen Borile |
bug |
|
|
added bug |
| 2018-10-11 09:09:00 |
Paul Stephen Borile |
attachment added |
|
strstr.c https://bugs.launchpad.net/bugs/1797335/+attachment/5199882/+files/strstr.c |
|
| 2018-10-11 09:09:29 |
Paul Stephen Borile |
description |
strstr() from glibc is up to 8 times slower than it was on ubuntu16. Looks like the sse2 optimized code is not used. To reproduce compile attached file (strstr.c) :
$ gcc -o strstr strstr.c
and then run on the 2 platforms :
$ vagrant init ubuntu/bionic64
$ vagrant up
$ vagrant ssh
Welcome to Ubuntu 18.04.1 LTS (GNU/Linux 4.15.0-36-generic x86_64)
* Documentation: https://help.ubuntu.com
* Management: https://landscape.canonical.com
* Support: https://ubuntu.com/advantage
System information as of Thu Oct 11 09:02:46 UTC 2018
System load: 0.0 Processes: 97
Usage of /: 9.8% of 9.63GB Users logged in: 0
Memory usage: 12% IP address for enp0s3: 10.0.2.15
Swap usage: 0%
* Security certifications for Ubuntu!
We now have FIPS, STIG, CC and a CIS Benchmark.
- http://bit.ly/Security_Certification
* Want to make a highly secure kiosk, smart display or touchscreen?
Here's a step-by-step tutorial for a rainy weekend, or a startup.
- https://bit.ly/secure-kiosk
Get cloud support with Ubuntu Advantage Cloud Guest:
http://www.ubuntu.com/business/services/cloud
0 packages can be updated.
0 updates are security updates.
Last login: Thu Oct 11 09:02:17 2018 from 10.0.2.2
vagrant@ubuntu-bionic:~$ cd /vagrant
vagrant@ubuntu-bionic:/vagrant$ time ./strstr aa
matches = 3000000
real 0m4.877s
user 0m4.852s
sys 0m0.012s
vagrant@ubuntu-bionic:/vagrant$
Same machine :
$ vagrant init ubuntu/xenial64
$ vagrant up
$ vagrant ssh
Welcome to Ubuntu 16.04.5 LTS (GNU/Linux 4.4.0-135-generic x86_64)
* Documentation: https://help.ubuntu.com
* Management: https://landscape.canonical.com
* Support: https://ubuntu.com/advantage
Get cloud support with Ubuntu Advantage Cloud Guest:
http://www.ubuntu.com/business/services/cloud
0 packages can be updated.
0 updates are security updates.
New release '18.04.1 LTS' available.
Run 'do-release-upgrade' to upgrade to it.
Last login: Thu Oct 11 08:22:26 2018 from 10.0.2.2
vagrant@ubuntu-xenial:~$ cd /vagrant
vagrant@ubuntu-xenial:/vagrant$ time ./strstr aa
matches = 3000000
real 0m0.525s
user 0m0.508s
sys 0m0.000s
vagrant@ubuntu-xenial:/vagrant$
vagrant@ubuntu-xenial:/vagrant$ time ./strstr aa
matches = 3000000
real 0m0.525s
user 0m0.508s
sys 0m0.000s
vagrant@ubuntu-xenial:/vagrant$ |
strstr() from glibc is up to 8 times slower than it was on ubuntu16. Looks like the sse2 optimized code is not used. To reproduce compile attached file (strstr.c) :
$ gcc -o strstr strstr.c
and then run on the 2 platforms :
$ vagrant init ubuntu/bionic64
$ vagrant up
$ vagrant ssh
Welcome to Ubuntu 18.04.1 LTS (GNU/Linux 4.15.0-36-generic x86_64)
* Documentation: https://help.ubuntu.com
* Management: https://landscape.canonical.com
* Support: https://ubuntu.com/advantage
System information as of Thu Oct 11 09:02:46 UTC 2018
System load: 0.0 Processes: 97
Usage of /: 9.8% of 9.63GB Users logged in: 0
Memory usage: 12% IP address for enp0s3: 10.0.2.15
Swap usage: 0%
* Security certifications for Ubuntu!
We now have FIPS, STIG, CC and a CIS Benchmark.
- http://bit.ly/Security_Certification
* Want to make a highly secure kiosk, smart display or touchscreen?
Here's a step-by-step tutorial for a rainy weekend, or a startup.
- https://bit.ly/secure-kiosk
Get cloud support with Ubuntu Advantage Cloud Guest:
http://www.ubuntu.com/business/services/cloud
0 packages can be updated.
0 updates are security updates.
Last login: Thu Oct 11 09:02:17 2018 from 10.0.2.2
vagrant@ubuntu-bionic:~$ cd /vagrant
vagrant@ubuntu-bionic:/vagrant$ time ./strstr aa
matches = 3000000
real 0m4.877s
user 0m4.852s
sys 0m0.012s
vagrant@ubuntu-bionic:/vagrant$
Same machine :
$ vagrant init ubuntu/xenial64
$ vagrant up
$ vagrant ssh
Welcome to Ubuntu 16.04.5 LTS (GNU/Linux 4.4.0-135-generic x86_64)
* Documentation: https://help.ubuntu.com
* Management: https://landscape.canonical.com
* Support: https://ubuntu.com/advantage
Get cloud support with Ubuntu Advantage Cloud Guest:
http://www.ubuntu.com/business/services/cloud
0 packages can be updated.
0 updates are security updates.
New release '18.04.1 LTS' available.
Run 'do-release-upgrade' to upgrade to it.
Last login: Thu Oct 11 08:22:26 2018 from 10.0.2.2
vagrant@ubuntu-xenial:~$ cd /vagrant
vagrant@ubuntu-xenial:/vagrant$ time ./strstr aa
matches = 3000000
real 0m0.525s
user 0m0.508s
sys 0m0.000s
vagrant@ubuntu-xenial:/vagrant$
vagrant@ubuntu-xenial:/vagrant$ time ./strstr aa
matches = 3000000
real 0m0.525s
user 0m0.508s
sys 0m0.000s
vagrant@ubuntu-xenial:/vagrant$ |
|
| 2018-11-29 22:50:45 |
Steve Langasek |
glibc (Ubuntu): status |
New |
Incomplete |
|
| 2018-11-30 00:34:12 |
Paul Stephen Borile |
bug watch added |
|
https://sourceware.org/bugzilla/show_bug.cgi?id=23709 |
|
| 2018-11-30 19:38:31 |
Adam Conrad |
bug task added |
|
glibc |
|
| 2018-11-30 19:58:04 |
Adam Conrad |
glibc (Ubuntu): status |
Incomplete |
Confirmed |
|
| 2018-11-30 19:58:07 |
Adam Conrad |
glibc (Ubuntu): assignee |
|
Adam Conrad (adconrad) |
|
| 2018-12-07 13:33:52 |
Francis Ginther |
tags |
bionic64 sse2 strstr |
bionic64 id-5c094c3baba7ce7cee465e9c sse2 strstr |
|
| 2018-12-07 20:55:07 |
Adam Conrad |
nominated for series |
|
Ubuntu Cosmic |
|
| 2018-12-07 20:55:07 |
Adam Conrad |
bug task added |
|
glibc (Ubuntu Cosmic) |
|
| 2018-12-07 20:55:07 |
Adam Conrad |
nominated for series |
|
Ubuntu Bionic |
|
| 2018-12-07 20:55:07 |
Adam Conrad |
bug task added |
|
glibc (Ubuntu Bionic) |
|
| 2020-05-04 19:01:50 |
Brian Murray |
glibc (Ubuntu Cosmic): status |
New |
Won't Fix |
|
| 2020-05-22 22:53:48 |
Balint Reczey |
glibc (Ubuntu): status |
Confirmed |
Fix Released |
|
| 2020-09-09 21:10:36 |
Balint Reczey |
description |
strstr() from glibc is up to 8 times slower than it was on ubuntu16. Looks like the sse2 optimized code is not used. To reproduce compile attached file (strstr.c) :
$ gcc -o strstr strstr.c
and then run on the 2 platforms :
$ vagrant init ubuntu/bionic64
$ vagrant up
$ vagrant ssh
Welcome to Ubuntu 18.04.1 LTS (GNU/Linux 4.15.0-36-generic x86_64)
* Documentation: https://help.ubuntu.com
* Management: https://landscape.canonical.com
* Support: https://ubuntu.com/advantage
System information as of Thu Oct 11 09:02:46 UTC 2018
System load: 0.0 Processes: 97
Usage of /: 9.8% of 9.63GB Users logged in: 0
Memory usage: 12% IP address for enp0s3: 10.0.2.15
Swap usage: 0%
* Security certifications for Ubuntu!
We now have FIPS, STIG, CC and a CIS Benchmark.
- http://bit.ly/Security_Certification
* Want to make a highly secure kiosk, smart display or touchscreen?
Here's a step-by-step tutorial for a rainy weekend, or a startup.
- https://bit.ly/secure-kiosk
Get cloud support with Ubuntu Advantage Cloud Guest:
http://www.ubuntu.com/business/services/cloud
0 packages can be updated.
0 updates are security updates.
Last login: Thu Oct 11 09:02:17 2018 from 10.0.2.2
vagrant@ubuntu-bionic:~$ cd /vagrant
vagrant@ubuntu-bionic:/vagrant$ time ./strstr aa
matches = 3000000
real 0m4.877s
user 0m4.852s
sys 0m0.012s
vagrant@ubuntu-bionic:/vagrant$
Same machine :
$ vagrant init ubuntu/xenial64
$ vagrant up
$ vagrant ssh
Welcome to Ubuntu 16.04.5 LTS (GNU/Linux 4.4.0-135-generic x86_64)
* Documentation: https://help.ubuntu.com
* Management: https://landscape.canonical.com
* Support: https://ubuntu.com/advantage
Get cloud support with Ubuntu Advantage Cloud Guest:
http://www.ubuntu.com/business/services/cloud
0 packages can be updated.
0 updates are security updates.
New release '18.04.1 LTS' available.
Run 'do-release-upgrade' to upgrade to it.
Last login: Thu Oct 11 08:22:26 2018 from 10.0.2.2
vagrant@ubuntu-xenial:~$ cd /vagrant
vagrant@ubuntu-xenial:/vagrant$ time ./strstr aa
matches = 3000000
real 0m0.525s
user 0m0.508s
sys 0m0.000s
vagrant@ubuntu-xenial:/vagrant$
vagrant@ubuntu-xenial:/vagrant$ time ./strstr aa
matches = 3000000
real 0m0.525s
user 0m0.508s
sys 0m0.000s
vagrant@ubuntu-xenial:/vagrant$ |
[Impact]
* Strstr() from glibc is up to 8 times slower than it was on ubuntu16.
[Test Case]
* Compile and run the attached strstr.c test on an affected Haswell CPU. For the exact Haswell model see the upstream bug report, Qemu can be used to emulate the right model.
* Observe much faster execution times with the fixed glibc package.
[Regression Potential]
* The fix changes the per-model CPU feautures handling in a very specific way fixing a previous change in the same area. Regressions here are unlikely, but could in theory cause slowdowns, crashes and miscalculations if the wrong CPU features are becoming used.
[Original Bug Text]
strstr() from glibc is up to 8 times slower than it was on ubuntu16. Looks like the sse2 optimized code is not used. To reproduce compile attached file (strstr.c) :
$ gcc -o strstr strstr.c
and then run on the 2 platforms :
$ vagrant init ubuntu/bionic64
$ vagrant up
$ vagrant ssh
Welcome to Ubuntu 18.04.1 LTS (GNU/Linux 4.15.0-36-generic x86_64)
* Documentation: https://help.ubuntu.com
* Management: https://landscape.canonical.com
* Support: https://ubuntu.com/advantage
System information as of Thu Oct 11 09:02:46 UTC 2018
System load: 0.0 Processes: 97
Usage of /: 9.8% of 9.63GB Users logged in: 0
Memory usage: 12% IP address for enp0s3: 10.0.2.15
Swap usage: 0%
* Security certifications for Ubuntu!
We now have FIPS, STIG, CC and a CIS Benchmark.
- http://bit.ly/Security_Certification
* Want to make a highly secure kiosk, smart display or touchscreen?
Here's a step-by-step tutorial for a rainy weekend, or a startup.
- https://bit.ly/secure-kiosk
Get cloud support with Ubuntu Advantage Cloud Guest:
http://www.ubuntu.com/business/services/cloud
0 packages can be updated.
0 updates are security updates.
Last login: Thu Oct 11 09:02:17 2018 from 10.0.2.2
vagrant@ubuntu-bionic:~$ cd /vagrant
vagrant@ubuntu-bionic:/vagrant$ time ./strstr aa
matches = 3000000
real 0m4.877s
user 0m4.852s
sys 0m0.012s
vagrant@ubuntu-bionic:/vagrant$
Same machine :
$ vagrant init ubuntu/xenial64
$ vagrant up
$ vagrant ssh
Welcome to Ubuntu 16.04.5 LTS (GNU/Linux 4.4.0-135-generic x86_64)
* Documentation: https://help.ubuntu.com
* Management: https://landscape.canonical.com
* Support: https://ubuntu.com/advantage
Get cloud support with Ubuntu Advantage Cloud Guest:
http://www.ubuntu.com/business/services/cloud
0 packages can be updated.
0 updates are security updates.
New release '18.04.1 LTS' available.
Run 'do-release-upgrade' to upgrade to it.
Last login: Thu Oct 11 08:22:26 2018 from 10.0.2.2
vagrant@ubuntu-xenial:~$ cd /vagrant
vagrant@ubuntu-xenial:/vagrant$ time ./strstr aa
matches = 3000000
real 0m0.525s
user 0m0.508s
sys 0m0.000s
vagrant@ubuntu-xenial:/vagrant$
vagrant@ubuntu-xenial:/vagrant$ time ./strstr aa
matches = 3000000
real 0m0.525s
user 0m0.508s
sys 0m0.000s
vagrant@ubuntu-xenial:/vagrant$ |
|
| 2020-09-10 23:04:01 |
Steve Langasek |
glibc (Ubuntu Bionic): status |
New |
Fix Committed |
|
| 2020-09-10 23:04:03 |
Steve Langasek |
bug |
|
|
added subscriber Ubuntu Stable Release Updates Team |
| 2020-09-10 23:04:06 |
Steve Langasek |
bug |
|
|
added subscriber SRU Verification |
| 2020-09-10 23:04:09 |
Steve Langasek |
tags |
bionic64 id-5c094c3baba7ce7cee465e9c sse2 strstr |
bionic64 id-5c094c3baba7ce7cee465e9c sse2 strstr verification-needed verification-needed-bionic |
|
| 2020-10-09 18:10:51 |
Balint Reczey |
tags |
bionic64 id-5c094c3baba7ce7cee465e9c sse2 strstr verification-needed verification-needed-bionic |
bionic64 id-5c094c3baba7ce7cee465e9c sse2 strstr verification-done verification-done-bionic |
|
| 2020-10-14 15:47:58 |
Matthieu Clemenceau |
tags |
bionic64 id-5c094c3baba7ce7cee465e9c sse2 strstr verification-done verification-done-bionic |
bionic64 fr-211 id-5c094c3baba7ce7cee465e9c sse2 strstr verification-done verification-done-bionic |
|
| 2020-11-02 18:30:36 |
Łukasz Zemczak |
removed subscriber Ubuntu Stable Release Updates Team |
|
|
|
| 2020-11-02 18:40:35 |
Launchpad Janitor |
glibc (Ubuntu Bionic): status |
Fix Committed |
Fix Released |
|
| 2020-11-02 18:40:35 |
Launchpad Janitor |
cve linked |
|
2017-18269 |
|
