On 3/30/2010 5:44 PM, William Taylor wrote:
> Before enabling encryption we were getting 118 - 120 MBs throughput to our 
> LTO-4 tape drive.
> With encryption turned on we get 38-39MBs throughput. bacula process is at 98 
> - 100 % cpu while running.
> I tried cutting the key size down to 472bits from 2048bits but it didn't make 
> a difference.
> The machine is a 2.3 Ghz quad core xeon w/ 12GB of ram.
> Everything is ran on one machine. (dir,fd,etc..)
>
> Any ideas whats up or how I can improve speed of backups w/ encryption 
> enabled?
>
> Thanks,
>    William
>
>    

Without encryption hardware, it likely is a high CPU load. I don't 
believe the encryption itself is multi-threaded. By 98-100% cpu, do you 
mean for one core or all 4?

Are you using spooling? Because the delay caused by encryption could 
cause the tape drive to be outrunning the data stream. If it has to 
start and stop repeatedly it would drastically affect throughput, and 
spooling could be a huge improvement.


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