On 4/10/2021 5:03 PM, David Coe wrote:
Results for AMD Ryzen 4700U running Ubuntu 21.04β kernel 5.11.0-13
$ sudo dmesg | grep IOMMU
[ 0.490352] pci 0000:00:00.2: AMD-Vi: IOMMU performance counters supported
[ 0.491985] pci 0000:00:00.2: AMD-Vi: Found IOMMU cap 0x40
[ 0.493732] perf/amd_iommu: Detected AMD IOMMU #0 (2 banks, 4 counters/bank).
[ 0.793259] AMD-Vi: AMD IOMMUv2 driver by Joerg Roedel <jroe...@suse.de>
....
$ sudo perf stat -e 'amd_iommu_0/cmd_processed/, amd_iommu_0/cmd_processed_inv/, amd_iommu_0/ign_rd_wr_mmio_1ff8h/, amd_iommu_0/int_dte_hit/, amd_iommu_0/int_dte_mis/, amd_iommu_0/mem_dte_hit/, amd_iommu_0/mem_dte_mis/, amd_iommu_0/mem_iommu_tlb_pde_hit/, amd_iommu_0/mem_iommu_tlb_pde_mis/, amd_iommu_0/mem_iommu_tlb_pte_hit/, amd_iommu_0/mem_iommu_tlb_pte_mis/, amd_iommu_0/mem_pass_excl/, amd_iommu_0/mem_pass_pretrans/, amd_iommu_0/mem_pass_untrans/, amd_iommu_0/mem_target_abort/,
amd_iommu_0/mem_trans_total/, amd_iommu_0/page_tbl_read_gst/, amd_iommu_0/page_tbl_read_nst/, amd_iommu_0/page_tbl_read_tot/, amd_iommu_0/smi_blk/, amd_iommu_0/smi_recv/, amd_iommu_0/tlb_inv/, amd_iommu_0/vapic_int_guest/, amd_iommu_0/vapic_int_non_guest/' sleep 10
Performance counter stats for 'system wide':
12 amd_iommu_0/cmd_processed/ (33.28%)
6 amd_iommu_0/cmd_processed_inv/ (33.32%)
0 amd_iommu_0/ign_rd_wr_mmio_1ff8h/ (33.36%)
290 amd_iommu_0/int_dte_hit/ (33.40%)
20 amd_iommu_0/int_dte_mis/ (33.46%)
391 amd_iommu_0/mem_dte_hit/ (33.49%)
3,720 amd_iommu_0/mem_dte_mis/ (33.49%)
44 amd_iommu_0/mem_iommu_tlb_pde_hit/ (33.46%)
810 amd_iommu_0/mem_iommu_tlb_pde_mis/ (33.45%)
35 amd_iommu_0/mem_iommu_tlb_pte_hit/ (33.41%)
746 amd_iommu_0/mem_iommu_tlb_pte_mis/ (33.37%)
0 amd_iommu_0/mem_pass_excl/ (33.32%)
0 amd_iommu_0/mem_pass_pretrans/ (33.28%)
0 amd_iommu_0/mem_pass_untrans/ (33.28%)
0 amd_iommu_0/mem_target_abort/ (33.27%)
715 amd_iommu_0/mem_trans_total/ (33.27%)
0 amd_iommu_0/page_tbl_read_gst/ (33.28%)
36 amd_iommu_0/page_tbl_read_nst/ (33.27%)
36 amd_iommu_0/page_tbl_read_tot/ (33.27%)
0 amd_iommu_0/smi_blk/ (33.28%)
0 amd_iommu_0/smi_recv/ (33.26%)
0 amd_iommu_0/tlb_inv/ (33.23%)
0 amd_iommu_0/vapic_int_guest/ (33.24%)
366 amd_iommu_0/vapic_int_non_guest/ (33.27%)
The immediately obvious difference is the with the enormous count seen on
mem_dte_mis on the older Ryzen 2400G. Will do some RTFM but anyone with
comments and insight?
841,689,151,202,939 amd_iommu_0/mem_dte_mis/ (33.44%)
Otherwise, all seems to running smoothly (especially for a distribution still
in β). Bravo and many thanks all!
That doesn't look correct. Lemme do some more investigation also.
Thanks,
Suravee
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