Hi, Tom.
Tom Duerbusch wrote:
On a side tangent.
At WAVV, one of the speakers said you never want to do software
encryption. The performance impact will eat you up.
Of course, I disagree.
As do I.......
In my book, it all depends on how much you want to encrypt. I'll do
it with spare cycles now, and pay for a hardware solution when there
is a payback. Your mileage and experiences may differ.
So, when you do software encryption (such as for DDR), how much more
processor time do you see? (over a standard DDR disk to tape)
Double? Tripple? 10X?
It depends (tm, B. Bitner....) on the encryption algorithm you choose to
use (DES, TDES, AES, etc.), whither chaining is used or not, how well
the algorithm was coded (in assembler?, a HLL?), and whither or not the
the actual hardware support the new cipher instructions (KM, KMC) IBM
makes available for the new zSeries boxes, and the encryption software
takes advanced of them.
The variations I have sen to date are in the range of 3x to 5x more
processing needed for software over hardware....your mileage will vary,
of course.
Tom Duerbusch THD Consulting
--
DJ
V/Soft
