Re: AMD Geode LX Security Block (was Re: NetBSD on the Soekris net5501 status report)

[Andrew Doran <ad%netbsd.org@localhost>]

On Mon, Jun 18, 2007 at 09:22:24AM -0400, Jack Lloyd wrote:
> On Mon, Jun 18, 2007 at 08:56:01AM -0400, Jared D. McNeill wrote:
> 
> >     Doing aes-128-cbc for 3s on 8192 size blocks: 9972 aes-128-cbc's in  
> > 0.01s
> 
> In that case your timing results may be off by a significant
> amount. OpenSSL is probably using times(2) to measure process CPU
> time, however since all the real work is being offloaded to a card
> there is very little to report. So when OpenSSL calculates the
> performance using work_done / time_used, the numbers come out too
> large. It would be better here to use wallclock time (clock_gettime or
> gettimeofday), which will more accurately measure the true throughput.

openssl speed -elapsed

Andrew