Last response from OR 2009. Upstream code fix 2012. -> Invalid
** No longer affects: linux (Ubuntu)
** Project changed: linux => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Importance: High => Undecided
** Changed in: linux (Ubuntu)
Status: Fix Released => New
** Changed in: linux (
** Bug watch added: trac.filezilla-project.org/ #11710
http://trac.filezilla-project.org/ticket/11710
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https://bugs.launchpad.net/bugs/336652
Title:
Poor system performance under I/O
Scott James Remnant, this bug was reported a while ago and there hasn't
been any activity in it recently. We were wondering if this is still an
issue? If so, could you please test for this with the latest development
release of Ubuntu? ISO images are available from
http://cdimage.ubuntu.com/daily-l
*** This bug is a duplicate of bug 131094 ***
https://bugs.launchpad.net/bugs/131094
Posted a comment concerning my D430 here:
https://bugs.launchpad.net/bugs/131094
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https://bugs.lau
*** This bug is a duplicate of bug 131094 ***
https://bugs.launchpad.net/bugs/131094
It seems to me that I have the same issue: high I/O but low cpu utilization as
well as high disk utilization but low throughput. My bootup times are very slow
(up to 5min for the desktop to fully load).
I h
*** This bug is a duplicate of bug 131094 ***
https://bugs.launchpad.net/bugs/131094
** This bug has been marked a duplicate of bug 131094
Heavy Disk I/O harms desktop responsiveness
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Poor system performance under I/O load
https://bugs.launchpad.net/bugs/336652
You received this bug not
This bug report was marked as Triaged a while ago but has not had any
updated comments for quite some time. Please let us know if this issue
remains in the current Ubuntu release,
http://www.ubuntu.com/getubuntu/download . If the issue remains, click
on the current status under the Status column
** Changed in: linux
Status: Confirmed => Invalid
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Poor system performance under I/O load
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this is a serious issue but only affects limited hardware therefore
marking Medium importance
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
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Poor system performance under I/O load
https://bugs.launchpad.net/bugs/336652
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** Changed in: linux (Ubuntu)
Status: New => Triaged
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Poor system performance under I/O load
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This is all occuring on:
Linux wing-commander 2.6.28-8-generic #26-Ubuntu SMP Wed Feb 25 04:28:54
UTC 2009 i686 GNU/Linux
(as you can see from the bootcharts :p)
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Poor system performance under I/O load
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I added an initramfs script to let me vary the nr_requests value from
the kernel command-line, but it doesn't seem to make a difference
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Poor system performance under I/O load
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** Attachment added: "Bootchart when booted with nr_requests=128"
http://launchpadlibrarian.net/23295436/jaunty-20090302-10.png
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Poor system performance under I/O load
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** Attachment added: "Bootchart when booted with nr_requests=64"
http://launchpadlibrarian.net/23295433/jaunty-20090302-9.png
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Poor system performance under I/O load
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** Attachment added: "Bootchart when booted with nr_requests=32"
http://launchpadlibrarian.net/23295429/jaunty-20090302-8.png
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Poor system performance under I/O load
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** Attachment added: "Bootchart when booted with nr_requests=16"
http://launchpadlibrarian.net/23295418/jaunty-20090302-7.png
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Poor system performance under I/O load
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wing-commander scott% dmesg | grep io\ scheduler
[2.099335] io scheduler noop registered
[2.099339] io scheduler anticipatory registered
[2.099343] io scheduler deadline registered
[2.099366] io scheduler cfq registered (default)
wing-commander scott% cat /sys/block/sda/queue/sche
Default clock source is HPET
wing-commander scott% cat /sys/devices/system/clocksource/clocksource0/*
hpet acpi_pm jiffies tsc
hpet
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** Attachment added: "Bootchart when booted with clocksource=acpi_pm"
http://launchpadlibrarian.net/23294304/jaunty-20090302-1.png
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Poor system performance under I/O load
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** Attachment added: "Bootchart when booted with clocksource=hpet (ie. default)"
http://launchpadlibrarian.net/23294289/jaunty-20090302-2.png
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Poor system performance under I/O load
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No different when changing clocksource between hpet and acpi_pm
Either X or compiz FAIL when using jiffies or tsc, or I'm impatient ;)
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Poor system performance under I/O load
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** Changed in: linux
Status: Unknown => Confirmed
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** Attachment added: "Bootchart showing high I/O wait"
http://launchpadlibrarian.net/23293547/jaunty-20090212-11.png
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