Hi Suravee!
Results for Ryzen 2400G on Ubuntu 20.10, kernel 5.8.0-50 with patch 2/2
alone. Events batched 3 x 8 to avoid counter-multiplexing (?) artefacts.
On 15/04/2021 10:28, Suthikulpanit, Suravee wrote:
David,
For the Ryzen 2400G, could you please try with:
- 1 event at a time
- Not more than 8 events (On your system, it has 2 banks x 4 counters/bank.
I am trying to see if this issue might be related to the counters
multiplexing).
$ sudo dmesg | grep IOMMU
[sudo] password for info:
[ 0.543768] pci 0000:00:00.2: AMD-Vi: IOMMU performance counters
supported
[ 0.547696] pci 0000:00:00.2: AMD-Vi: Found IOMMU cap 0x40
[ 0.549196] perf/amd_iommu: Detected AMD IOMMU #0 (2 banks, 4
counters/bank).
[ 0.811538] AMD-Vi: AMD IOMMUv2 driver by Joerg Roedel <jroe...@suse.de>
$ declare -a EventList=("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/")
$ for event in "${EventList[@]}"; do sudo perf stat -e "$event" sleep 10
; done
Performance counter stats for 'system wide':
18 amd_iommu_0/cmd_processed/
9 amd_iommu_0/cmd_processed_inv/
0 amd_iommu_0/ign_rd_wr_mmio_1ff8h/
399 amd_iommu_0/int_dte_hit/
19 amd_iommu_0/int_dte_mis/
1,177 amd_iommu_0/mem_dte_hit/
5,521 amd_iommu_0/mem_dte_mis/
70 amd_iommu_0/mem_iommu_tlb_pde_hit/
10.001490092 seconds time elapsed
Performance counter stats for 'system wide':
394 amd_iommu_0/mem_iommu_tlb_pde_mis/
602 amd_iommu_0/mem_iommu_tlb_pte_hit/
6,612 amd_iommu_0/mem_iommu_tlb_pte_mis/
0 amd_iommu_0/mem_pass_excl/
0 amd_iommu_0/mem_pass_pretrans/
6,590 amd_iommu_0/mem_pass_untrans/
0 amd_iommu_0/mem_target_abort/
616 amd_iommu_0/mem_trans_total/
10.001237585 seconds time elapsed
Performance counter stats for 'system wide':
0 amd_iommu_0/page_tbl_read_gst/
78 amd_iommu_0/page_tbl_read_nst/
78 amd_iommu_0/page_tbl_read_tot/
0 amd_iommu_0/smi_blk/
0 amd_iommu_0/smi_recv/
0 amd_iommu_0/tlb_inv/
0 amd_iommu_0/vapic_int_guest/
637 amd_iommu_0/vapic_int_non_guest/
10.001186031 seconds time elapsed
Best regards,
--
David
