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Isochronous operation negatively impacts memory performance, as per Intel MLC (Memory Latency Checker) benchmark results. Thus, disable isochronous operation, like analogous UEFI firmware does. The MLC results after disabling isoch: "--max_bandwidth" ALL Reads : 106948.17 3:1 Reads-Writes : 101580.46 2:1 Reads-Writes : 100523.26 1:1 Reads-Writes : 99059.44 Stream-triad like : 97762.47 "--peak_injection_bandwidth" ALL Reads : 105724.3 3:1 Reads-Writes : 100655.8 2:1 Reads-Writes : 99463 1:1 Reads-Writes : 98708 Stream-triad like : 91515 The MLC results before disabling isoch: "--max_bandwidth" ALL Reads : 88824.96 3:1 Reads-Writes : 94820.81 2:1 Reads-Writes : 94867.53 1:1 Reads-Writes : 92567.36 Stream-triad like : 91900.43 "--peak_injection_bandwidth" ALL Reads : 88859.6 3:1 Reads-Writes : 94064 2:1 Reads-Writes : 94186.2 1:1 Reads-Writes : 92516.1 Stream-triad like : 85147.4 TEST=On OCP Delta Lake, verify that MLC benchmark results have improved. Change-Id: I08c22ee001b601e607452b3f23fad969ecb484b4 Signed-off-by: Johnny Lin <johnny_lin@wiwynn.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/48738 Reviewed-by: Marc Jones <marc@marcjonesconsulting.com> Reviewed-by: Jonathan Zhang <jonzhang@fb.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org> |
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