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Bug#628718: marked as done (linux-2.6: Swap on encrypted volume slows system to a crawl (not explicable by encryption overhead))

Your message dated Sun, 07 Feb 2016 22:43:08 +0000
with message-id <E1aSY2u-0006G6-E0@deadeye>
and subject line Closing bugs assigned to linux-2.6 package
has caused the Debian Bug report #628718,
regarding linux-2.6: Swap on encrypted volume slows system to a crawl (not explicable by encryption overhead)
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner@bugs.debian.org
immediately.)


-- 
628718: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=628718
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: linux-2.6
Version: 2.6.38-2
Severity: important


I'm using swap space on an LVM volume on a LUKS-encrypted partition.
Swapping is ridiculously slow (< 1MB/s) whenever I swap to either the encrypted
swap partition, or some file inside an encrypted partition.
It is reasonably fast when swapping to a file on an unencrypted partition.

Normal writes (file copying, dd if=/dev/zero, etc) to the encrypted partition are
reasonably fast (~30MB/s), so the CPU overhead caused by encryption
cannot account for this.

[I posted a similar bug for 2.6.32 to the linux-image-*-686 package in squeeze, which
was probably a bad idea, so I'm posting this to the linux-2.6 source package,
where all the other bugs are posted.]

The real-world impact is that, for example, when I open a huge image in iceweasel
with other stuff already open in the background, the system virtually freezes
up for 15 minutes or more.



-- System Information:
Debian Release: wheezy/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: i386 (i686)

Kernel: Linux 2.6.38-2-686 (SMP w/1 CPU core)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

--- End Message ---
--- Begin Message --- 
Version: 3.4.1-1~experimental.1+rm

Debian 6.0 Long Term Support has now ended, and the 'linux-2.6' source
package will no longer be updated.  This bug is being closed on the
assumption that it does not affect the kernel versions in newer Debian
releases.

If you can still reproduce this bug in a newer release, please reopen
the bug report and reassign it to 'src:linux' and the affected version
of the package.  You can find the package version for the running
kernel by running:

    uname -v

or the versions of all installed kernel packages by running:

    dpkg -l 'linux-image-[34]*' | grep ^.i

and looking at the third column.

I apologise that we weren't able to provide a specific resolution for
this bug.

Ben.

-- 
Ben Hutchings - Debian developer, member of Linux kernel and LTS teams

--- End Message ---
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