Please don't brush this aside as "poor performance". This is an issue in long disk activities. I notice this bug in both disk copies and dd. I use dd quite frequently to clone disk images onto identical computers and very regularly have to copy these 75.4GB disk images. While i have not done a forensic investigation this is what i have noticed after facing this issue MANY times:
1. It definitely affects Ububtu 9.10, Ububtu 9.04, Ububtu 8.10, Ububtu 9.10UNR, Ububtu 9.10UNR. (It seems to be a bigger problem UNR distros) 2. In Ubuntu 9.04 i get this slowdown in approximately 25% of the dd clones i do (2 out of 7 computers this weekend). Canceling and restarting the computer don't fix this issue. Note: For dd clones i boot off a USB stick and invoke dd in a terminal window. The drive images copy from a file on a NTFS drive to /dev/sda or vice-versa. 3. Using the computer makes this bug less likely to happen. (I truly believe this has something to do with efficient power consumption or reducing disk writes.) 4. The read/write rate decreases over time in a predictable manner. A dd clone which works normally copies the 75.4GB file in 3054s give or take 10. If the bug occurs it takes approx. 23200s. This is a real problem. I will do some proper testing and analysis based on suggestion. -- file transfers on USB flash key (pendrive) or USB HDD are slowing down with time https://bugs.launchpad.net/bugs/197762 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
