[Bug 660976] [NEW] swapon generates high disk-write (on ssd)

[inneas]

Public bug reported:

/dev/sdb is a corsair F40 SSD (with sandforce controller)
/dev/sdb2 is 2GiB swap 

On swapon i've high cpu load and 2GiB written data to sdb.

*** iostat -m -d /dev/sdb
Linux 2.6.35-22-generic (InspiLin) 	15.10.2010 	_i686_	(2 CPU)

Device:            tps    MB_read/s    MB_wrtn/s    MB_read    MB_wrtn
sdb                49,99           2,21           0,04          149            2

***  swapon /dev/sdb2

*** iostat -m -d /dev/sdb
Linux 2.6.35-22-generic (InspiLin) 	15.10.2010 	_i686_	(2 CPU)

Device:            tps    MB_read/s    MB_wrtn/s    MB_read    MB_wrtn
sdb                28,21           1,16          13,45          177         2051


I've logged vmstat and iotop while swapon. See attached files (i cant find anything interesting in there).

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: linux-image-2.6.35-22-generic 2.6.35-22.34
Regression: No
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.35-22.34-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  innerand   1763 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfebfc000 irq 46'
   Mixer name	: 'SigmaTel STAC9205'
   Components	: 'HDA:838476a0,102801f2,00100204 HDA:14f12c06,14f1000f,00100000'
   Controls      : 18
   Simple ctrls  : 11
Date: Fri Oct 15 09:14:53 2010
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=5d72d0e7-d5e1-4fce-b329-f1e9a74bddda
MachineType: Dell Inc. Inspiron 1720
ProcCmdLine: BOOT_IMAGE=/vmlinuz-2.6.35-22-generic root=UUID=aa86ba8f-39d3-49a7-ae88-f60dff7c7d2b ro quiet splash
ProcEnviron:
 LANG=de_DE.utf8
 SHELL=/bin/bash
RelatedPackageVersions: linux-firmware 1.38
SourcePackage: linux
dmi.bios.date: 02/03/2008
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A07
dmi.board.name: 0UK437
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA07:bd02/03/2008:svnDellInc.:pnInspiron1720:pvr:rvnDellInc.:rn0UK437:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: Inspiron 1720
dmi.sys.vendor: Dell Inc.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 kernel-fs maverick needs-upstream-testing ssd swap

-- 
swapon generates high disk-write (on ssd)
https://bugs.launchpad.net/bugs/660976
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