Note that the crossbar is about the size of a core, and that all of the caches lie between it and the the cache's core.
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ToBeContinued
Oracle reports the bandwidth of the crossbar tops to 180GB/s, while Core-i7's QPI is around 10-20 GB/s. It seems full crossbar does offer a incredible performance boost.
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tpassaro
Still, even with great performance gains, you loose a whole lot of the dye to just the interconnect.
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kayvonf
@ToBeContinued. You're comparing inter-chip communication via QPI to inter-core communication on the same chip via the T2 crossbar. That's not a fair comparison. A more fair comparison would be to compare the crossbar's bandwidth to the ring bus bandwidth on a modern Intel CPU.
Note that the crossbar is about the size of a core, and that all of the caches lie between it and the the cache's core.
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Oracle reports the bandwidth of the crossbar tops to 180GB/s, while Core-i7's QPI is around 10-20 GB/s. It seems full crossbar does offer a incredible performance boost.
This comment was marked helpful 0 times.
Still, even with great performance gains, you loose a whole lot of the dye to just the interconnect.
This comment was marked helpful 0 times.
@ToBeContinued. You're comparing inter-chip communication via QPI to inter-core communication on the same chip via the T2 crossbar. That's not a fair comparison. A more fair comparison would be to compare the crossbar's bandwidth to the ring bus bandwidth on a modern Intel CPU.
This comment was marked helpful 0 times.