apport information
** Tags added: apport-collected
** Description changed:
I would expect the cached read speeds to be the same as the cache is above
the encryption device mapper layer.
Using dm-crypt read speeds are inconsistent averaging 380 MB/s, not using
dm-crypt read speeds are consistently 1200 MB/s.
I used dd to test at least 12 times:
dd if=./test.file of=/dev/null bs=1M count=1024
lsb_release -rd:
Description: Ubuntu 10.04.3 LTS
Release: 10.04
apt-cache policy cryptsetup:
cryptsetup:
Installed: 2:1.1.0~rc2-1ubuntu13
Candidate: 2:1.1.0~rc2-1ubuntu13
Version table:
*** 2:1.1.0~rc2-1ubuntu13 0
500 http://us.archive.ubuntu.com/ubuntu/ lucid/main Packages
100 /var/lib/dpkg/status
+ ---
+ AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
+ AplayDevices: Error: [Errno 2] No such file or directory
+ Architecture: i386
+ ArecordDevices: Error: [Errno 2] No such file or directory
+ AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path',
'/dev/snd/controlC0', '/dev/snd/hwC0D2', '/dev/snd/pcmC0D0c',
'/dev/snd/pcmC0D0p', '/dev/snd/timer'] failed with exit code 1:
+ CRDA: Error: [Errno 2] No such file or directory
+ Card0.Amixer.info: Error: [Errno 2] No such file or directory
+ Card0.Amixer.values: Error: [Errno 2] No such file or directory
+ DistroRelease: Ubuntu 10.04
+ HibernationDevice: RESUME=UUID=bedd48c0-3471-4c24-931d-ce224b3f746c
+ MachineType: Dell Inc. Dell DV051
+ Package: linux (not installed)
+ ProcCmdLine: root=UUID=bae54c1d-5f65-4a70-bff5-e9200e4ab461 ro quiet splash
+ ProcEnviron:
+ LANG=en_US.UTF-8
+ SHELL=/bin/bash
+ ProcVersionSignature: Ubuntu 2.6.32-33.72-generic-pae 2.6.32.41+drm33.18
+ Regression: No
+ RelatedPackageVersions: linux-firmware 1.34.7
+ Reproducible: Yes
+ RfKill:
+
+ Tags: lucid filesystem needs-upstream-testing
+ Uname: Linux 2.6.32-33-generic-pae i686
+ UserGroups:
+
+ WifiSyslog:
+
+ dmi.bios.date: 10/08/2005
+ dmi.bios.vendor: Dell Inc.
+ dmi.bios.version: A03
+ dmi.board.name: 0JC474
+ dmi.board.vendor: Dell Inc.
+ dmi.chassis.type: 6
+ dmi.chassis.vendor: Dell Inc.
+ dmi.modalias:
dmi:bvnDellInc.:bvrA03:bd10/08/2005:svnDellInc.:pnDellDV051:pvr:rvnDellInc.:rn0JC474:rvr:cvnDellInc.:ct6:cvr:
+ dmi.product.name: Dell DV051
+ dmi.sys.vendor: Dell Inc.
** Attachment added: "AlsaDevices.txt"
https://bugs.edge.launchpad.net/bugs/875733/+attachment/2553604/+files/AlsaDevices.txt
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https://bugs.launchpad.net/bugs/875733
Title:
disk cache is slow on average with dm-crypt
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