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Xiaomi Mi Pad (Tegra K1)
Siarhei Siamashka edited this page Mar 31, 2016
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processor : 0 model name : ARMv7 Processor rev 3 (v7l) Features : swp half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt CPU implementer : 0x41 CPU architecture: 7 CPU variant : 0x3 CPU part : 0xc0f CPU revision : 3 processor : 1 model name : ARMv7 Processor rev 3 (v7l) Features : swp half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt CPU implementer : 0x41 CPU architecture: 7 CPU variant : 0x3 CPU part : 0xc0f CPU revision : 3 processor : 2 model name : ARMv7 Processor rev 3 (v7l) Features : swp half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt CPU implementer : 0x41 CPU architecture: 7 CPU variant : 0x3 CPU part : 0xc0f CPU revision : 3 processor : 3 model name : ARMv7 Processor rev 3 (v7l) Features : swp half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt CPU implementer : 0x41 CPU architecture: 7 CPU variant : 0x3 CPU part : 0xc0f CPU revision : 3 Hardware : mocha Revision : 0000 Serial : 0000000000000000 Processor : ARMv7 Processor rev 3 (v7l)
tinymembench v0.3.9 (simple benchmark for memory throughput and latency)
==========================================================================
== Memory bandwidth tests ==
== ==
== Note 1: 1MB = 1000000 bytes ==
== Note 2: Results for 'copy' tests show how many bytes can be ==
== copied per second (adding together read and writen ==
== bytes would have provided twice higher numbers) ==
== Note 3: 2-pass copy means that we are using a small temporary buffer ==
== to first fetch data into it, and only then write it to the ==
== destination (source -> L1 cache, L1 cache -> destination) ==
== Note 4: If sample standard deviation exceeds 0.1%, it is shown in ==
== brackets ==
==========================================================================
C copy backwards : 1119.3 MB/s (1.4%)
C copy : 1145.1 MB/s (0.3%)
C copy prefetched (32 bytes step) : 1334.5 MB/s
C copy prefetched (64 bytes step) : 1335.2 MB/s (1.1%)
C 2-pass copy : 1207.4 MB/s
C 2-pass copy prefetched (32 bytes step) : 1342.9 MB/s
C 2-pass copy prefetched (64 bytes step) : 1343.5 MB/s (0.7%)
C fill : 12536.4 MB/s (1.7%)
---
standard memcpy : 2198.2 MB/s (7.1%)
standard memset : 11778.3 MB/s (1.1%)
---
NEON read : 3167.5 MB/s (8.4%)
NEON read prefetched (32 bytes step) : 3356.1 MB/s (1.8%)
NEON read prefetched (64 bytes step) : 3355.9 MB/s (0.6%)
NEON read 2 data streams : 2456.3 MB/s (0.3%)
NEON read 2 data streams prefetched (32 bytes step) : 3358.2 MB/s (1.8%)
NEON read 2 data streams prefetched (64 bytes step) : 3358.3 MB/s
NEON copy : 2218.5 MB/s (0.8%)
NEON copy prefetched (32 bytes step) : 2551.2 MB/s (0.8%)
NEON copy prefetched (64 bytes step) : 2552.0 MB/s
NEON unrolled copy : 1923.2 MB/s (0.3%)
NEON unrolled copy prefetched (32 bytes step) : 2603.5 MB/s
NEON unrolled copy prefetched (64 bytes step) : 2618.8 MB/s
NEON copy backwards : 1139.5 MB/s
NEON copy backwards prefetched (32 bytes step) : 1330.1 MB/s
NEON copy backwards prefetched (64 bytes step) : 1330.8 MB/s (1.5%)
NEON 2-pass copy : 1922.0 MB/s
NEON 2-pass copy prefetched (32 bytes step) : 2206.5 MB/s
NEON 2-pass copy prefetched (64 bytes step) : 2208.2 MB/s
NEON unrolled 2-pass copy : 1477.2 MB/s (1.5%)
NEON unrolled 2-pass copy prefetched (32 bytes step) : 1828.7 MB/s (0.5%)
NEON unrolled 2-pass copy prefetched (64 bytes step) : 1695.4 MB/s (0.9%)
NEON fill : 12535.3 MB/s (1.2%)
NEON fill backwards : 3001.9 MB/s (8.1%)
VFP copy : 1924.5 MB/s
VFP 2-pass copy : 1448.9 MB/s
ARM fill (STRD) : 12559.2 MB/s (1.3%)
ARM fill (STM with 8 registers) : 12556.4 MB/s
ARM fill (STM with 4 registers) : 12565.2 MB/s
ARM copy prefetched (incr pld) : 3390.3 MB/s (9.7%)
ARM copy prefetched (wrap pld) : 2475.6 MB/s
ARM 2-pass copy prefetched (incr pld) : 1680.5 MB/s
ARM 2-pass copy prefetched (wrap pld) : 1660.1 MB/s
==========================================================================
== Memory latency test ==
== ==
== Average time is measured for random memory accesses in the buffers ==
== of different sizes. The larger is the buffer, the more significant ==
== are relative contributions of TLB, L1/L2 cache misses and SDRAM ==
== accesses. For extremely large buffer sizes we are expecting to see ==
== page table walk with several requests to SDRAM for almost every ==
== memory access (though 64MiB is not nearly large enough to experience ==
== this effect to its fullest). ==
== ==
== Note 1: All the numbers are representing extra time, which needs to ==
== be added to L1 cache latency. The cycle timings for L1 cache ==
== latency can be usually found in the processor documentation. ==
== Note 2: Dual random read means that we are simultaneously performing ==
== two independent memory accesses at a time. In the case if ==
== the memory subsystem can't handle multiple outstanding ==
== requests, dual random read has the same timings as two ==
== single reads performed one after another. ==
==========================================================================
block size : single random read / dual random read
1024 : 0.0 ns / 0.0 ns
2048 : 0.0 ns / 0.0 ns
4096 : 0.0 ns / 0.0 ns
8192 : 0.0 ns / 0.0 ns
16384 : 0.0 ns / 0.0 ns
32768 : 0.0 ns / 0.0 ns
65536 : 4.2 ns / 6.4 ns
131072 : 6.5 ns / 8.5 ns
262144 : 9.1 ns / 11.1 ns
524288 : 10.4 ns / 12.6 ns
1048576 : 11.3 ns / 13.5 ns
2097152 : 17.8 ns / 22.5 ns
4194304 : 97.9 ns / 148.2 ns
8388608 : 139.3 ns / 189.7 ns
16777216 : 161.1 ns / 207.2 ns
33554432 : 173.3 ns / 218.6 ns
67108864 : 187.7 ns / 240.9 ns
Kernel 4.9.140-tegra #1 SMP PREEMPT Wed Mar 13 00:32:22 PDT 2019 aarch64 GNU/Linux Under xorg, no compositor active, no browser or other cpu hogs.
tinymembench v0.4.9 (simple benchmark for memory thr
==========================================================================
== Memory bandwidth tests ==
== ==
== Note 1: 1MB = 1000000 bytes ==
== Note 2: Results for 'copy' tests show how many bytes can be ==
== copied per second (adding together read and writen ==
== bytes would have provided twice higher numbers) ==
== Note 3: 2-pass copy means that we are using a small temporary buffer ==
== to first fetch data into it, and only then write it to the ==
== destination (source -> L1 cache, L1 cache -> destination) ==
== Note 4: If sample standard deviation exceeds 0.1%, it is shown in ==
== brackets ==
==========================================================================
C copy backwards : 2949.7 MB/s (3.8%)
C copy backwards (32 byte blocks) : 3011.8 MB/s
C copy backwards (64 byte blocks) : 3029.2 MB/s
C copy : 3642.2 MB/s (4.1%)
C copy prefetched (32 bytes step) : 3824.4 MB/s (0.3%)
C copy prefetched (64 bytes step) : 3825.3 MB/s (0.4%)
C 2-pass copy : 2726.2 MB/s
C 2-pass copy prefetched (32 bytes step) : 2902.6 MB/s (2.5%)
C 2-pass copy prefetched (64 bytes step) : 2928.3 MB/s (0.3%)
C fill : 8541.0 MB/s (0.2%)
C fill (shuffle within 16 byte blocks) : 8518.5 MB/s (2.1%)
C fill (shuffle within 32 byte blocks) : 8537.1 MB/s (0.1%)
C fill (shuffle within 64 byte blocks) : 8528.7 MB/s (0.2%)
---
standard memcpy : 3558.8 MB/s
standard memset : 8520.2 MB/s
---
NEON LDP/STP copy : 3633.9 MB/s (4.2%)
NEON LDP/STP copy pldl2strm (32 bytes step) : 1451.0 MB/s (0.3%)
NEON LDP/STP copy pldl2strm (64 bytes step) : 1450.9 MB/s (0.5%)
NEON LDP/STP copy pldl1keep (32 bytes step) : 3882.5 MB/s (3.9%)
NEON LDP/STP copy pldl1keep (64 bytes step) : 3884.0 MB/s (0.4%)
NEON LD1/ST1 copy : 3630.8 MB/s (0.3%)
NEON STP fill : 8537.8 MB/s
NEON STNP fill : 8544.9 MB/s (1.7%)
ARM LDP/STP copy : 3635.8 MB/s (0.3%)
ARM STP fill : 8544.8 MB/s (0.1%)
ARM STNP fill : 8549.2 MB/s (1.0%)
==========================================================================
== Framebuffer read tests. ==
== ==
== Many ARM devices use a part of the system memory as the framebuffer, ==
== typically mapped as uncached but with write-combining enabled. ==
== Writes to such framebuffers are quite fast, but reads are much ==
== slower and very sensitive to the alignment and the selection of ==
== CPU instructions which are used for accessing memory. ==
== ==
== Many x86 systems allocate the framebuffer in the GPU memory, ==
== accessible for the CPU via a relatively slow PCI-E bus. Moreover, ==
== PCI-E is asymmetric and handles reads a lot worse than writes. ==
== ==
== If uncached framebuffer reads are reasonably fast (at least 100 MB/s ==
== or preferably >300 MB/s), then using the shadow framebuffer layer ==
== is not necessary in Xorg DDX drivers, resulting in a nice overall ==
== performance improvement. For example, the xf86-video-fbturbo DDX ==
== uses this trick. ==
==========================================================================
NEON LDP/STP copy (from framebuffer) : 766.0 MB/s
NEON LDP/STP 2-pass copy (from framebuffer) : 688.8 MB/s
NEON LD1/ST1 copy (from framebuffer) : 770.6 MB/s (0.1%)
NEON LD1/ST1 2-pass copy (from framebuffer) : 681.3 MB/s (0.3%)
ARM LDP/STP copy (from framebuffer) : 766.1 MB/s
ARM LDP/STP 2-pass copy (from framebuffer) : 689.1 MB/s
==========================================================================
== Memory latency test ==
== ==
== Average time is measured for random memory accesses in the buffers ==
== of different sizes. The larger is the buffer, the more significant ==
== are relative contributions of TLB, L1/L2 cache misses and SDRAM ==
== accesses. For extremely large buffer sizes we are expecting to see ==
== page table walk with several requests to SDRAM for almost every ==
== memory access (though 64MiB is not nearly large enough to experience ==
== this effect to its fullest). ==
== ==
== Note 1: All the numbers are representing extra time, which needs to ==
== be added to L1 cache latency. The cycle timings for L1 cache ==
== latency can be usually found in the processor documentation. ==
== Note 2: Dual random read means that we are simultaneously performing ==
== two independent memory accesses at a time. In the case if ==
== the memory subsystem can't handle multiple outstanding ==
== requests, dual random read has the same timings as two ==
== single reads performed one after another. ==
==========================================================================
block size : single random read / dual random read, [MADV_NOHUGEPAGE]
1024 : 0.0 ns / 0.1 ns
2048 : 0.0 ns / 0.1 ns
4096 : 0.0 ns / 0.1 ns
8192 : 0.0 ns / 0.1 ns
16384 : 0.1 ns / 0.1 ns
32768 : 1.7 ns / 2.9 ns
65536 : 6.4 ns / 9.5 ns
131072 : 9.6 ns / 12.3 ns
262144 : 13.7 ns / 17.0 ns
524288 : 15.8 ns / 19.7 ns
1048576 : 17.3 ns / 22.1 ns
2097152 : 42.1 ns / 64.2 ns
4194304 : 98.5 ns / 138.1 ns
8388608 : 143.9 ns / 186.3 ns
16777216 : 167.2 ns / 211.2 ns
33554432 : 180.1 ns / 227.1 ns
67108864 : 200.0 ns / 260.2 ns
block size : single random read / dual random read, [MADV_HUGEPAGE]
1024 : 0.0 ns / 0.0 ns
2048 : 0.0 ns / 0.0 ns
4096 : 0.0 ns / 0.0 ns
8192 : 0.0 ns / 0.0 ns
16384 : 0.0 ns / 0.0 ns
32768 : 0.0 ns / 0.0 ns
65536 : 6.4 ns / 9.4 ns
131072 : 9.5 ns / 12.2 ns
262144 : 11.2 ns / 13.1 ns
524288 : 12.1 ns / 13.5 ns
1048576 : 12.8 ns / 13.6 ns
2097152 : 27.0 ns / 33.0 ns
4194304 : 90.6 ns / 127.8 ns
8388608 : 123.9 ns / 153.8 ns
16777216 : 139.5 ns / 161.2 ns
33554432 : 147.2 ns / 163.6 ns
67108864 : 154.0 ns / 167.6 ns