[Bug 247964] Low read throughput on Sandisk Extreme external SSD

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247964

            Bug ID: 247964
           Summary: Low read throughput on Sandisk Extreme external SSD
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: usb
          Assignee: usb at FreeBSD.org
          Reporter: thj at FreeBSD.org

With a 250GB Sandisk Extreme external SSD read performance with FreeBSD is
lower than Linux and macOS. I have tested this on FreeBSD on a Thinkpad x270
and 10th Generation Intel NUC. On Linux on the Intel NUC and from MacOS on a
2018 Macbook pro.

I evaluated read and write performance by using dd (with only path adaptations
for Linux and macOS) on the device:

dd if=/dev/zero of=/dev/da0 bs=1m count=50000
dd if=/dev/da0 of=/dev/null bs=1m count=50000

On all platforms write speed is approximately 200MB/s
On Linux and macOS read speed is approximately 500MB/s, while on FreeBSD it is
approx 200MB/s

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