Compare the SiFive Essential 6-Series and 7-Series cores. Specifically, identify which core offers higher DMIPS/MHz performance, which has a dual-issue superscalar architecture, confirm if both are Linux-capable, and state whether the 6-Series supports coherent multicore with a shared L2 cache.
Navigate to the SiFive Essential Family page. Locate and extract the DMIPS/MHz performance, architecture (single/dual-issue), and Linux capability for the 6-Series from the family page or its dedicated page. Confirm if the 6-Series supports coherent multicore with a shared L2 cache from its dedicated page. Navigate to the SiFive Essential 7-Series product page by clicking its 'View' link. Locate and extract the DMIPS/MHz performance, confirm the dual-issue superscalar architecture, and Linux capability for the 7-Series from its dedicated page. Synthesize the gathered information to provide a comparative answer addressing all aspects of the task.
State that the 7-Series offers higher DMIPS/MHz performance (Up to 3.3 DMIPS/MHz for 7-Series vs. Up to 2.1 DMIPS/MHz for 6-Series). Confirm that the 7-Series features a dual-issue superscalar architecture, while the 6-Series is single-issue. Confirm that both the 6-Series (U6 only) and 7-Series (U7 only) are Linux-capable. Confirm that the 6-Series is coherent multicore capable with shared Level 2 cache.