Hi all,
After compiling kernels for a while I found out why the Fedora's kernel works
for me: it is built without PAE support.
I've bisected Ubuntu' and Fedora's .config files and it turnes out that
CONFIG_HIGHMEM4G=y fixes my issue ;) .
After that I rebooted my machine with default Ubuntu
After investigating UPower sources I've triaged the problem to this:
/usr/sbin/pm-powersave false = /usr/lib/pm-utils/power.d/laptop-mode
false = echo 10 /proc/sys/vm/dirty_ratio
If I change /proc/sys/vm/dirty_ratio to any different value (more or
less than previous value!) then I got my issue.
So all you have to do is change /proc/sys/vm/dirty_ratio, even only
slightly, up, or down, and it triggers this behavior? This just keeps
getting weirder and weirder. If you put it back to 20, does it go away?
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Phillip,
Yes, exactly.
No, it doesn't go away; I don't know a way to get back normal IO speed without
a reboot. :(
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https://bugs.launchpad.net/bugs/1264707
Title:
IO
That is one strange problem.
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https://bugs.launchpad.net/bugs/1264707
Title:
IO limit 1.2 MB/s for 32bit ubuntu (ACPI issues)
Status in “linux” package in Ubuntu:
** Summary changed:
- IO limit 1.2 MB/s for 32bit ubuntu (after running lightdm service)
+ IO limit 1.2 MB/s for 32bit ubuntu (ACPI issues)
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I've investigated a lot and found out that it is an ACPI issue, IMHO.
After more installing and purging packages I found out that two packages
breaks the system: acpi-support and upower.
If I uninstall them then I have no IO issues.
The new workaround without uninstalling packages:
- disable
One more (maybe political) question: is amd64 support better than i386 for
Ubuntu?
Because:
- I see some littel issues when using 64bit Linux'es for the desktop (the sound
hissing in Skype etc)
- Skype, Steam and other commercial products are shipped for i386 only; so I
still need to use i386
I also tested with the following kernel parameters:
- acpi=off gives me 18Mb/s; it is better than 1 Mb/s but still bad
- pci=noacpi has no effect, 1 Mb/s.
** Description changed:
I recently installed a new motherboard Asus M5A99FX PRO R2.0 and found out
that IO speed is very low; i.e. the dd
Similar bug:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/119730
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You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1264707
Title:
IO limit 1.2 MB/s for 32bit ubuntu (ACPI issues)
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