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