gbde Performance - 35Mb/s vs 5.2 MB/s

[Christophe Zwecker]

Hi,

I  get 35MB/s write without gbde and 5 MB on a gbde crypted device.

Hardware:
700 GB ATA Raid5 3ware, P4 2.6ghz , 512mb ram

I set sector size to 2048, performance increased to 5mb/sec. cmd to
creat fs was:

newfs -b 16384 -f 2048 -U -m 0.0005% -i 262144 /dev/twed0s1h.bde

size of the fs is bout 700GB, inodes should be enough for 45.000 files
(there will be big files mostly).

tried newfs without -m and without -b -f. No change in performance.
do you have any other idea or does 5mb sound about right. Seems awfull
slow for a 35mb/s raid.

here how I tested:

Crypted device:
dd if=/dev/zero of=/mnt/test0.trash bs=1024k count=100
104857600 bytes transferred in 19.927204 secs (5262033 bytes/sec)

Noncrypted:
dd if=/dev/zero of=/test0.trash bs=1024k count=100
104857600 bytes transferred in 2.993742 secs (35025597 bytes/sec)

Could anyone tell me if this is supposed to be slow like that ? Or is
there anything I missed ?

thx alot for you help!


Christophe

-- 
Christophe Zwecker                     mail: doc at zwecker.de
Hamburg, Germany                        fon: +49 179 3994867
http://www.zwecker.de

"Who is General Failure ?  And why is he reading my disk ??"