On Fri, 7 Sep 2012, Stephen Dubovsky wrote: > Date: Fri, 7 Sep 2012 14:05:06 -0400 > From: Stephen Dubovsky <smdubov...@gmail.com> > Reply-To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] [OT] measuring real-world latency, > was Re: worsk: sim parport component > > Any scope (esp PC based ones) have a blanking period while they are moving > data, processing, then looking for the next trigger. They will do jitter > analysis just fine on one screen of data but will miss outliers. Even > megabuck agilent/tek/lecroy scopes don't get 100%. > > So... Why not just write some code for a mesa fpga board? Cheap, fast, > 100% data coverage.
I dont think you need much, just set a stepgen to velocity mode at say 5 MHz and sample the stepgen.feedback pin every thread invocation and feed to hal-sampler, then process the file. (extract deltas --> run statistics) This is liable to be much more realistic than reading the CPU clock cycle counter as the CPU clock is always readable but ISA/LPC/PCI/PCIE/Memory access may be blocked by other processes > > On Fri, Sep 7, 2012 at 1:52 PM, Joachim Franek <joachim.fra...@pibf.de>wrote: > >> >> What about: >> > ... > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. Discussions > will include endpoint security, mobile security and the latest in malware > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
