Hi, On 23/05/18 23:30, Daniel Wagner wrote: > Hi, > > On 23.05.2018 06:19, Seokhee Han wrote: >>> The results of portwell seems more than just bad - they same >>> unbelievable, the error is VERY high (2msec). >>> >>> I've tried to find a benchmark which can support my results, but found >>> no benchmark with ATOM. >> I am now developing RT Linux system on minnowboard Turbot Quad Core board, >> which adopts ATOM E3845 series SoC, and it shows above about 2ms worst-case >> latency during cyclictest. So I try to detect SMI-related, kernel unaware, >> hw latency using Linux kernel's hwlat tracer and it tells me that there are >> couples of latency spikes (above 1000us) on the board. > FWIW, I played a while with a MinnowBoard too. As it turns out the > firmware provided from Intel is just no good for -rt. I ended up > building a firmware with coreboot. With coreboot all the 2-3ms spikes > were gone. Unfortunately, building your own firmware for the MinnowBoard > is far from easy though possible: > > https://3mdeb.com/firmware/building-coreboot-on-minnowboard/ > > Thanks, > Daniel > -- > To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > I agree with your comment. It is not so easy to build firmware and find any information about it, because it's my first time to handle intel SoC board. Unfortunately, I cannot access your link. I can see just "500 Internal error" in any pages on https://3mdeb.com/, including your link. Anyway, Thanks a lot and welcome further information. Seokhee -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
