Kernel EOL, closing this bug, please feel free to open a new one.
** Changed in: linux (Ubuntu)
Status: Confirmed => Invalid
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Title:
@Todd
are you sure they are not swappable?
according to lwn they are:
http://lwn.net/Articles/423584/
This scheme will increase the use of huge pages transparently, but it does not
yet solve the whole problem. Huge pages must be swappable, lest the system run
out of memory in a hurry. Rather
@Julian,
That isn't what the article is saying. Huge pages are not swappable at
the moment. However Andrea's work splits huge pages into base pages for
a number of reasons, one of those is memory pressure that would force
part of the page to be swapped out.
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I know non-anonymous huge pages, like those from hugetblfs, are currently not
swappable.
But if I understand the article correctly _anonymous_ huge pages can be swapped.
You lose the benefits of huge pages in this case (as they are split) but the
system does not regress in functionality.
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Based on what we've been seeing maintaining Oracle Linux, there are many
workloads for which THP results in a ~9-10% performance hit overall on
the system, and this includes kernels up through 3.8.13 (which we're
using as the baseline for a new kernel in that distro). It has to do
with the fact
BTW, by we're probably going to remove it for the time being, I'm
referring to the kernels in the distro at my day job (OL). I use Ubuntu
at home. ;)
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According to Documentation/vm/transhuge.txt you can also set it as the
boot parameter transparent_hugepage=always. The problem with setting
it via sysfs is that none of the processes started before you made the
change will use huge pages.
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I spent a day compiling a custom kernel with transparent huge pages
enabled and set to always use mode (not madvise). I have been using
the kernel for the last 24 hours without any trouble.
I find my laptop more responsive now. An informal test is that
Stellarium's CPU utilisation was 45% in the
HRJ:
per https://lists.ubuntu.com/archives/ubuntu-devel/2011-September/034060.html,
Oneiric will ship with
CONFIG_TRANSPARENT_HUGEPAGE=y
# CONFIG_TRANSPARENT_HUGEPAGE_ALWAYS is not set
CONFIG_TRANSPARENT_HUGEPAGE_MADVISE=y
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Thanks Julian.
Too bad they made it madvise and not always.
There is sysfs entry at /sys/kernel/mm/transparent_hugepage/ which
allows changing the policy at run time, but I am not sure if it can be
turned on if the kernel config has madvise.
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$ grep TRANSPARENT /boot/config-2.6.38-11-generic
# CONFIG_TRANSPARENT_HUGEPAGE is not set
Is there any hope of this being enabled on 11.10?
** Changed in: linux (Ubuntu)
Status: Incomplete = Confirmed
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Bugs, which
so maybe i'm not understanding this correctly, but in regards to
* [Config] disable CONFIG_TRANSPARENT_HUGEPAGE to fix i386 boot crashes
... why isn't it only disabled for the i386 ??? ... it appears to be
disabled for everything
i just installed linux-image-server-lts-backport-natty on Ubuntu
Come on, this is automated triage gone insane. Why does anyone have to
collect any logs for a report where it takes anyone interested a second
or two to confirm that yes, the kernel config is missing the option
reported as missing??
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THP is disabled before rebasing to 2.6.38 release. Is this bug still remaining?
If so, how about enabling THP on amd64 only?
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Title:
Transparent
Transparent huge pages are enabled in the Fedora Core 15 and work well.
I think THP helps common workloads (browser, office suite). If they are
not enabled in natty, I may have to switch to Fedora - or at least run
some benchmarks, because a 10-15% performance gain is material for me.
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You
Just noticed this myself. In the changelog for linux-image-2.6.38, I
see:
linux (2.6.38-1.27) natty; urgency=low
...
* [Config] disable CONFIG_TRANSPARENT_HUGEPAGE to fix i386 boot
crashes
Pretty disappointing that this is just turned off instead of debugging
the crash, since it is a
** Package changed: ubuntu = linux (Ubuntu)
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Title:
Transparent HugePages not enabled in 11.04 kernel
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