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

Poul-Henning Kamp phk at phk.freebsd.dk
Mon May 26 05:21:24 PDT 2003


In message <3ED203E6.1000202 at zwecker.de>, Christophe Zwecker writes:
>Hi,
>
>I  get 35MB/s write without gbde and 5 MB on a gbde crypted device.

>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 ?

This sounds pretty likely for write performance.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.


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