☰

Raspberry Pi 4 使用 USB-3 SSD 的写入速度（以 kb/s 为单位）是多少？

tag-icon • tag-icon usb ssd performance raspberry-pi
Raspberry Pi 4 使用 USB-3 SSD 的写入速度（以 kb/s 为单位）是多少？

TLDR；Raspberry Pi 4 上的 USB-3 SSD 的读取速度为 322KiB/s，写入速度为 108KiB/s，预计至少为 MB/s……

我已经浏览过关于这个的每个论坛，使用这个测试：
sudo fio --randrepeat=1 --ioengine=libaio --direct=1 --gtod_reduce=1 --name=test --filename=test --bs=4k --iodepth=64 --size=4G --readwrite=randrw --rwmixread=75
我得到了以下结果：

test: (groupid=0, jobs=1): err= 0: pid=29327: Mon Oct 17 01:54:05 2022
  read: IOPS=80, BW=322KiB/s (330kB/s)(3070MiB/9752067msec)
   bw (  KiB/s): min=   32, max=  640, per=100.00%, avg=322.30, stdev=56.10, samples=19503
   iops        : min=    8, max=  160, avg=80.53, stdev=14.03, samples=19503
  write: IOPS=26, BW=108KiB/s (110kB/s)(1026MiB/9752067msec); 0 zone resets
   bw (  KiB/s): min=    7, max=  240, per=100.00%, avg=107.68, stdev=30.44, samples=19502
   iops        : min=    1, max=   60, avg=26.87, stdev= 7.61, samples=19502
  cpu          : usr=0.19%, sys=1.23%, ctx=1066066, majf=0, minf=18
  IO depths    : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=0.1%, >=64=100.0%
     submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.1%, >=64=0.0%
     issued rwts: total=785920,262656,0,0 short=0,0,0,0 dropped=0,0,0,0
     latency   : target=0, window=0, percentile=100.00%, depth=64

Run status group 0 (all jobs):
   READ: bw=322KiB/s (330kB/s), 322KiB/s-322KiB/s (330kB/s-330kB/s), io=3070MiB (3219MB), run=9752067-9752067msec
  WRITE: bw=108KiB/s (110kB/s), 108KiB/s-108KiB/s (110kB/s-110kB/s), io=1026MiB (1076MB), run=9752067-9752067msec

Disk stats (read/write):
  sdc: ios=785603/312743, merge=310/2356, ticks=16335446/3116502, in_queue=17370112, util=100.00%

系统设置是 raspberry pi 4 硬件上的 64 位 Ubuntu（内核5.4.0-1071-raspi），已确认我正在从 dmesg“使用 xhci_hcd”驱动程序，也没有错误。

尝试在 cmdline.txt 中为设备添加“usb-storage.quirks”，但没有任何变化。

SSD 是

[436294.004115] usb 2-2: Product: Elements 2621
[436294.004126] usb 2-2: Manufacturer: Western Digital

还有谁在 Pi 4 设置中看到了这个问题，可以提供帮助吗？

答案1

您正在执行的randrw操作当然比顺序 rw 操作慢得多，尤其是在旋转 HDD 上，甚至通过 USB 执行得更慢。

来自fio文档：

 readwrite=str, rw=str

    Type of I/O pattern. Accepted values are:

        read
            Sequential reads.
        write
            Sequential writes.
        trim
            Sequential trims (Linux block devices and SCSI character devices only).
        randread
            Random reads.
        randwrite
            Random writes.
        randtrim
            Random trims (Linux block devices and SCSI character devices only).
        rw,readwrite
            Sequential mixed reads and writes.
        randrw
            Random mixed reads and writes.
        trimwrite
            Sequential trim+write sequences. Blocks will be trimmed first, then the same blocks will be written to. So if io_size=64K is specified, Fio will trim a total of 64K bytes and also write 64K bytes on the same trimmed blocks. This behaviour will be consistent with number_ios or other Fio options limiting the total bytes or number of I/O’s.
        randtrimwrite
            Like trimwrite, but uses random offsets rather than sequential writes.

相关内容