Re: Reiser4 on dmcrypt

[Anders Aagaard <aagaande@gmail.com>]

Edward Shishkin wrote:
> Anders Aagaard wrote:
>> Hi
>>
>> Been trying to move my home directory over to reiser4, and I ran into
>> some issues, this is what I did:
>>
>> PASSCODE="temptest"
>> echo $PASSCODE | cryptsetup luksFormat /dev/sdf6 -c
>> twofish-cbc-essiv:sha256 -s 256
>> echo $PASSCODE | cryptsetup luksOpen /dev/sdf6 tempHome
>> mkfs.reiser4 -o create=ccreg40,compress=lzo1 /dev/mapper/tempHome
>>
>> mount -t reiser4 -o noatime /dev/mapper/tempHome /mnt/x
>>
>> rsync -vax --progress /home/neuron/ /mnt/x/
>>
>> During rsync I noticed this in top while moving over a virtualbox image:
>>   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
>>  2427 root      20   0     0    0    0 R  100  0.0  14:32.01 pdflush
>>  9497 root      20   0     0    0    0 R  100  0.0  11:38.48 rsync
>>
>> It did continue, but I figured something was wrong, so I interrupted
>> the rsync and unmounted.  The rsync reported my copy speed was down to
>> 3-4mb/sec.  This is on a fairly new quad core, so I should be able to
>> encrypt and compress the data without difficulty.
>>
> 
> Yeah, something goes wrong..
> Would you please try default (reg40) plugin in the same configuration?


That does work, although the performance reported by rsync seems very 
unstable (although that could be a lot of issues), varying between 10 
and 25mb/sec.  Note that I do not have the patch to enable write 
barriers on single dm devices, so it's running in "synchronous write", I 
will try with that patch aswell though.

> 
> Thanks,
> Edward.
> 
>> I remounted and started again, it starts by coping at 14-15mb/sec, and
>> then just slows down as pdflush hits 100% cpu usage.  Iowait also goes
>> down to around 5%.  When I interrupt it pdflush disapears instantly,
>> and rsync sticks around for 10-15 seconds (making it unmountable for
>> that period) until it dies.
>>
>> The file it's having problems with is a 6.8gb virtualbox image I use
>> as a gentoo test enviroment.
>>
>> Anders Aagaard
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> 
>