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. ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users