[Bug 253274] When using sftp to transfer files, there are severe performance loss and high CPU usage.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253274

            Bug ID: 253274
           Summary: When using sftp to transfer files, there are severe
                    performance loss and high CPU usage.
           Product: Base System
           Version: 12.2-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: number201724 at me.com

Created attachment 222187
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=222187&action=edit
screenshot

When I use sftp to transfer a close to 30GB to freebsd, sftp, sshd and kernel
seem to occupy a very high CPU, and the transfer speed is slow. And the speed
is only about 50MByte/s.

At the same time, I transfer files to Linux under the same network environment,
and it has a speed of more than 100MByte/s. And the cpu usage is low.


Attached is a screenshot

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