On 1/12/2014 2:29 PM, Gilles Chanteperdrix wrote: > On 01/11/2014 09:58 PM, Charles Steinkuehler wrote: >> Recommended but not selected (causes linking errors apparently due to >> the kernel size being too large for some of the limited reach thumb2 >> jump/branch instructions): > > You mean thumb2? Did you enable the workaround for buggy gas?
Yes, thumb2, and yes, the buggy gas workaround was enabled (by default when selecting a thumb2 build). Googling the resulting errors brought up some threads about iMX6 kernel builds failing the same way, which is where I got "too big for some jump/branch instructions" which I also translate as "beyond my currently capability to fix with any expectation that I'm not introducing other issues". :) >> OVERALL RESULTS: >> Adding the recommended options dramatically helped with latency when >> iPipe trace was enabled, but not so much for the normal kernel. I did >> see typical and best case latency drop significantly (by about 25%) with >> the recommended options, but worst-case latency for both kernels >> remained around 50 uS. > > I also get 50us at 1kHz, I only get 40us at 10kHz. Good, it sounds like we're seeing basically the same numbers. I can live with the 50 uS latency, which is already significantly better than I was expecting since I hadn't done testing for a while. -- Charles Steinkuehler [email protected] -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 261 bytes Desc: OpenPGP digital signature URL: <http://www.xenomai.org/pipermail/xenomai/attachments/20140112/3bf13f7c/attachment.sig> _______________________________________________ Xenomai mailing list [email protected] http://www.xenomai.org/mailman/listinfo/xenomai
