The Precise Pangolin has reached end of life, so this bug will not be
fixed for that release
** Changed in: linux (Ubuntu Precise)
Status: Triaged => Won't Fix
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** Changed in: linux (Ubuntu Quantal)
Status: Triaged => Won't Fix
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https://bugs.launchpad.net/bugs/1064521
Title:
Kernel I/O scheduling writes starving reads, local DoS
To mana
And now what happens with Ubuntu 14.04?
(yeah, too lazy myself to test, sorry)
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Title:
Kernel I/O scheduling writes starving reads, local DoS
To
** Tags added: bios-outdated-2.6.1 needs-upstream-testing regression-
release
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Title:
Kernel I/O scheduling writes starving reads, local DoS
To
Disabling AIO and changing allocator to SLOB relaxed the problem. With
other allocators like SLAB and SLUB I see no improvement.
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Title:
Kernel I
Thread on LKML:
https://lkml.org/lkml/2012/10/11/177
** Tags added: kernel-bug-exists-upstream kernel-da-key quantal
** Also affects: linux (Ubuntu Precise)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Quantal)
Importance: Medium
Status: Confirmed
** Cha
11:55 log file
** Attachment added: "11:55 log file"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1064521/+attachment/3396240/+files/logfile_11_55_12_10_2012.log
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11:35 log file
** Attachment added: "11:35 log file"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1064521/+attachment/3396239/+files/logfile_11_35_12_10_2012.log
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11:17 log file
** Attachment added: "11:17 log file"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1064521/+attachment/3396238/+files/logfile_11_17_12_10_2012.log
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I have upgraded our Kernel to 3.6.1
(cat /proc/version output)
Linux version 3.6.1-030601-generic (apw@gomeisa) (gcc version 4.6.3
(Ubuntu/Linaro 4.6.3-1ubuntu5) ) #201210071322 SMP Sun Oct 7 17:23:28 UTC 2012
And ran the DD test with the sql-test2.py script also running, the quantal
kernel app
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
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Title:
Kernel I/O scheduling writes starving reads, local DoS
To manage notifi
Output of ( while /bin/true ; do date ; cat /proc/meminfo ; vmstat 1 2 ; echo "
"; sleep 1 ; done ) > mylog
files edited to show only data which matches previously attached log files
File for run starting at 10:11
** Attachment added: "10:11+ log file"
https://bugs.launchpad.net/ubuntu/+sour
sql-test2.py log file output from run started 10:11 this morning
** Attachment added: "10:11 sql-test2.py log file"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1064521/+attachment/3394572/+files/logfile_10_11_11_10_2012.log
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Output of ( while /bin/true ; do date ; cat /proc/meminfo ; vmstat 1 2 ; echo "
"; sleep 1 ; done ) > mylog
files edited to show only data which matches previously attached log files
File for run starting at 10:46
** Attachment added: "10:26+ log file"
https://bugs.launchpad.net/ubuntu/+sou
Output of ( while /bin/true ; do date ; cat /proc/meminfo ; vmstat 1 2 ; echo "
"; sleep 1 ; done ) > mylog
files edited to show only data which matches previously attached log files
File for run starting at 10:21
** Attachment added: "10:21+ log file"
https://bugs.launchpad.net/ubuntu/+sou
log file 2
** Attachment added: "log2"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1064521/+attachment/3394541/+files/logfile_10_21_11_10_2012.log
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Please find attached log files generated by the sql-test2.py script
attached above.
These were generated while running "dd if=/dev/zero of=- bs=1M
count=5 | dd if=- of=myfile bs=1M count=5"
On the hardware described at the start of the bug with the deadline
scheduler active.
You can see
file attached here
** Attachment added: "updated sql-test2.py script"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1064521/+attachment/3394456/+files/sql-test2.py
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Please find attached the updated sql-test2.py script
It should be run in the same way as the previous one, however the output
has been reformatted to show sql query execution time
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Easier way of replicating:
dd if=/dev/zero of=- bs=1M count=5 | dd if=- of=myfile bs=1M
count=5
(two dd's to prevent dd optimisation of /dev/zero writes), whilst
running Ric's script (he's just about to upload a better version.
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Please find attached sql-test.py.
This script requires mysql to be installed on the test platform and to
be run with sudo if the user is not root.
It will create a database called test_db and a table called test in the
local mySQL instance.
It will then update and select from the test table ever
This is related to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1008400
The outcome of bug 1008400 is (I think) 'this is fixed on Quantal by changing
the default IO scheduler to Deadline'. Two problems with that:
1. We see the same problem (but to a lesser extent) on the deadline sched
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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Title:
Kernel I/O scheduling writes starving reads, local DoS
To manage no
apport information
** Tags added: apport-collected
** Description changed:
On the Precise default kernel, it is possible by executing zcat on a
large file for an unprivileged user to disrupt I/O sufficiently that it
causes serious disruption.
Serious disruption means (e.g.) a single M
** Visibility changed to: Public
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Title:
Kernel I/O scheduling writes starving reads, local DoS
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