AMD ships microcode update to disable some branch prediction

Re:AMD ships microcode update to disable some branch prediction by mitchty on Friday January 05, 2018 @05:59PM (#16082539)

Correct, FPGA simulation of a 3.0Ghz processor means you'd be waiting on the order of weeks to boot into linux.

I work for a company that works with Intel on new things. Lets just say the FPGA's they use are... really expensive, and despite being capable of simulating a design fast, are still very slow.

By expensive I found out $20 million per FPGA simulator was on the low end. And I think that would simulate at the rate of about 10mhz for the amount of transistors/internal setup present.

Fpgas are cool, but a poor choice for fixing this issue.

You could probably do it for up to an 80386 with some $400ish dollar FPGA's.

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Re:AMD ships microcode update to disable some branch prediction by BuildTheRobots on Saturday January 06, 2018 @06:57PM (#16088203)

Weeks! - Thank you, I knewit was slower, but that's such an order of magnitude slower I don't even know how to calculate it :)

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Re:AMD ships microcode update to disable some branch prediction by mitchty on Tuesday January 09, 2018 @11:07AM (#16107129)

Processor bring up is fun to learn about, then you learn you don't want to know how that sausage is made any longer. >.<

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