This bug affects me too. $ uname -a Linux aammscott 4.8.0-54-generic #57~16.04.1-Ubuntu SMP Wed May 24 16:20:44 UTC 2017 i686 i686 i686 GNU/Linux
-Version- Kernel : Linux 4.8.0-54-generic (i686) Distribution : Ubuntu 16.04.2 LTS -Board- Name : P8H77-V LE Vendor : ASUSTeK COMPUTER INC. (SEAGATE, www.seagate.com) -Computer- Processor : 4x Intel(R) Core(TM) i5-3450 CPU @ 3.10GHz Memory : 16552MB (1441MB used) -SCSI Disks- ATA Crucial_CT2050MX Optiarc DVD RW AD-7280S Originally reported https://ubuntuforums.org/showthread.php?t=2363087&highlight= I used the same tests as above, with the following modifications: - Not run as root (NEVER RUN rm -rf AS ROOT!) - cwd set to ~/tmp (mkdir /tmp if you need to) My results on my 16 GB RAM 32 bit install of 16.04.02 (updated) are: Copying /lib to 1: 8.95 Copying 1 to 2: 18.01 Copying 2 to 3: 10.79 Copying 3 to 4: 10.23 Copying 4 to 5: 8.94 Copying 5 to 6: 8.70 Copying 6 to 7: 8.50 Copying 7 to 8: 8.00 Copying 8 to 9: 9.25 Copying 9 to 0: 9.55 Copying 0 to 1: 9.69 Copying 1 to 2: 12.30 Copying 2 to 3: 16.05 Copying 3 to 4: 36.38 Copying 4 to 5: 212.44 Copying 5 to 6: 323.97 To me that is a clear reproduction. I then booted into the live cd of 64 bit 16.04.02, and mounted all my file systems, just as though I was going to reinstall grub, and also mounted my separate /home partition, all under /mnt. I chrooted into /mnt, ran sudo -su <username> to limit myself to normal user privileges, then ran the same test. Results are: Copying /lib to 1: 8.07 Copying 1 to 2: 1.00 Copying 2 to 3: 1.63 Copying 3 to 4: 1.63 Copying 4 to 5: 1.89 Copying 5 to 6: 2.77 Copying 6 to 7: 2.08 Copying 7 to 8: 1.81 Copying 8 to 9: 1.79 Copying 9 to 0: 1.95 Copying 0 to 1: 1.68 Copying 1 to 2: 1.45 Copying 2 to 3: 1.55 Copying 3 to 4: 1.75 Copying 4 to 5: 1.38 Copying 5 to 6: 1.55 Copying 6 to 7: 1.60 Copying 7 to 8: 1.78 Copying 8 to 9: 1.24 Copying 9 to 0: 1.44 Copying 0 to 1: 1.58 Copying 1 to 2: 1.76 Copying 2 to 3: 1.49 Copying 3 to 4: 1.47 Copying 4 to 5: 1.50 Copying 5 to 6: 1.55 Copying 6 to 7: 1.25 Copying 7 to 8: 1.51 Copying 8 to 9: 1.54 Copying 9 to 0: 1.84 Copying 0 to 1: 2.20 Copying 1 to 2: 2.54 Copying 2 to 3: 2.74 Copying 3 to 4: 2.78 Copying 4 to 5: 2.78 Copying 5 to 6: 2.52 Copying 6 to 7: 2.47 Copying 7 to 8: 2.77 Copying 8 to 9: 1.90 Copying 9 to 0: 2.68 Copying 0 to 1: 2.44 Copying 1 to 2: 2.66 Copying 2 to 3: 2.38 Copying 3 to 4: 2.70 Copying 4 to 5: 2.68 Copying 5 to 6: 2.67 Copying 6 to 7: 2.21 Copying 7 to 8: 2.55 Copying 8 to 9: 2.73 Copying 9 to 0: 2.70 Copying 0 to 1: 2.17 Copying 1 to 2: 2.49 Copying 2 to 3: 2.66 Copying 3 to 4: 2.83 Copying 4 to 5: 2.43 Copying 5 to 6: 2.63 Copying 6 to 7: 2.47 Copying 7 to 8: 2.81 Copying 8 to 9: 2.58 Conclusions: - Bug only affects 32 bit installs with 16 GB RAM (or more?) - IO performance under 64 bit on my hardware is 4-5 times better in any case. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1698118 Title: Slow disk writes after some uptime, only on certain hw and 4.4+ kernels To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-hwe/+bug/1698118/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
