GELI speed

[Clayton Milos]

>> On 29.03.2011 00:57, Clayton Milos wrote:
>>> Hi Pawel
>>>
>>> I'm running GELI encryption on a hardware RAID5 (8x1TB), formatted to 
>>> 6.3T
>>> usable space using i386 FreeBSD 7.3-PRERELEASE. Write speeds to the 
>>> drive
>>> are just over 40MB/s which is not too bad but I would like to improve it 
>>> as
>>> the drive gets 270MB/s without encryption.
>>>
>>> I've run the following tests:
>>> dd if=/dev/gzero.eli of=/dev/null bs=1m count=4096
>>> 4294967296 bytes transferred in 99.763266 secs (43051591 bytes/sec)
>>> and then
>>> dd if=/dev/zero of=test.file bs=1m count=1024
>>> 1073741824 bytes transferred in 26.118988 secs (41109626 bytes/sec)
>>>
>>> There is not much speed lost due to the filesystem throughput or the 
>>> RAID
>>> card.
>>
>> You can also try increase reading performance by using geom_cache
>> with sufficiently large cache. It won't impact on linear reads
>> but for general operations like directory lookups, many short reads etc.
>> it can decrease number of decrypt requests.
>>
>> Eugene Grosbein
>>
>
> Thanks Eugene. unfortunately I have some large directories with ~2000 
> files in them so if that slowed down it would be painful.
>
> Clay

I've upgraded to i386 8.2-RELEASE as the amd64 version was still crashing. 
It could be a hardware incompatability with the HADMA motherboard.

Now on 8.2-RELEASE when I run "geli onetime -s 4096 gzero" it crashes the 
box with a kernel fault.

Clay