Bug 34132
Summary: | System is unresponsive while using dd to copy DVD ISO to USB stick/key | ||
---|---|---|---|
Product: | IO/Storage | Reporter: | Jure Repinc (jlp.bugs) |
Component: | Other | Assignee: | io_other |
Status: | RESOLVED OBSOLETE | ||
Severity: | high | CC: | alan, Simon.Ruggier |
Priority: | P1 | ||
Hardware: | All | ||
OS: | Linux | ||
Kernel Version: | 2.6.38.2 | Subsystem: | |
Regression: | No | Bisected commit-id: | |
Attachments: |
dmesg2
lspci2 config2 |
Description
Jure Repinc
2011-04-30 16:12:13 UTC
Created attachment 55962 [details]
dmesg2
Created attachment 55972 [details]
lspci2
Created attachment 55982 [details]
config2
This has been somewhat addressed in later kernels Alas, I'm seeing this behaviour on a 3.16 kernel (although, it's a distribution kernel from Debian testing). $ uname -a Linux SPR-T500 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt2-1 (2014-12-08) x86_64 GNU/Linux Running `echo never > /sys/kernel/mm/transparent_hugepage/defrag`, seems to make the general responsiveness problem go away, while running `sysctl vm.dirty_background_ratio=1 vm.dirty_ratio=2` seems to help reduce the slowdown for individual processes that try to fsync. I confirmed that reverting these changes causes the problem to come back. Should I open a new bug, or should this one be reopened? |