Created attachment 1104269 [details] smartctl info and tests run Description of problem: Under F23, my notebook's hard disk has very poor performance most of the times: - when the machine is started, i can write one 40 MB file on it with ~ 140 MBps - after a little while, the write speed decreases to around 4 MBps. I've seen it once recovering before reboot for a short time, but i was not able to reproduce this recovery. The device it's a Seagate hybrid (SSD+HDD). See the attached file for the smartctl info and some exaqmple test run. This problem was detected while updating the system. This can take more than one day, at ~ 4 MBps. I do not see this in Centos 7, after more than 24 hours of uptime. But of course i may see it later. The Centos 7 kernel is 3.10 (x64). In Fedora 23 i have: # uname -a Linux otp-cpanceac-l1.corp.ad.wrs.com 4.2.5-201.fc22.i686+PAE #1 SMP Wed Oct 28 20:18:23 UTC 2015 i686 i686 i386 GNU/Linux Also i did not see it in Windows 7 x64 after a few tests (around one hour of uptime.) Some pointers on how to investigate this further would be appreciated. Version-Release number of selected component (if applicable): How reproducible: most of the times. Steps to Reproduce: 1.run the test in the attached file (or just run time dd if=... of=...) 2. 3. Actual results: Expected results: Additional info:
*********** MASS BUG UPDATE ************** We apologize for the inconvenience. There is a large number of bugs to go through and several of them have gone stale. Due to this, we are doing a mass bug update across all of the Fedora 23 kernel bugs. Fedora 23 has now been rebased to 4.7.4-100.fc23. Please test this kernel update (or newer) and let us know if you issue has been resolved or if it is still present with the newer kernel. If you have moved on to Fedora 24 or 25, and are still experiencing this issue, please change the version to Fedora 24 or 25. If you experience different issues, please open a new bug report for those.
Still happening in Fedora 24
Still happening on F24 with kernel 4.8.6-201.fc24.i686+PAE .
Maybe it's specific to x86 architecture. After replacing x86 F24 with x86_64 F25, the problem seems to be gone: # uname -a Linux otp-cpanceac-l1.corp.ad.wrs.com 4.8.6-300.fc25.x86_64 #1 SMP Tue Nov 1 12:36:38 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux # rm -f /testfile1; time dd if=/dev/zero of=/testfile1 bs=4M count=10 10+0 records in 10+0 records out 41943040 bytes (42 MB, 40 MiB) copied, 0.0336276 s, 1.2 GB/s real 0m0.035s user 0m0.000s sys 0m0.034s # rm -f /testfile1; time dd if=/dev/zero of=/testfile1 bs=4M count=1024 1024+0 records in 1024+0 records out 4294967296 bytes (4.3 GB, 4.0 GiB) copied, 42.0159 s, 102 MB/s real 0m42.018s user 0m0.005s sys 0m2.624s However, Firefox seems to crawl still, but this may be another bug.
*********** MASS BUG UPDATE ************** We apologize for the inconvenience. There are a large number of bugs to go through and several of them have gone stale. Due to this, we are doing a mass bug update across all of the Fedora 24 kernel bugs. Fedora 25 has now been rebased to 4.10.9-100.fc24. Please test this kernel update (or newer) and let us know if you issue has been resolved or if it is still present with the newer kernel. If you have moved on to Fedora 26, and are still experiencing this issue, please change the version to Fedora 26. If you experience different issues, please open a new bug report for those.
as said before: i've switched to 64 bits and now the problem is gone.
Closing this as insufficient data then. Feel free to reopen if needed.