[Bug 247964] Low read throughput on Sandisk Extreme external SSD
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Date: Sun, 13 Oct 2024 15:39:45 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247964
Oliver Fromme <olli@FreeBSD.org> changed:
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--- Comment #5 from Oliver Fromme <olli@FreeBSD.org> ---
(In reply to Mark Linimon from comment #3)
(Note, I'm not the submitter, but I'm affected, too.)
It certainly is relevant, but it's probably not easy to fix. As far as I know,
FreeBSD only supports BOT (bulk-only transfer) for USB mass storage devices,
which is too slow for modern external SSD and similar devices. For better
speed, UASP support (USB-attached SCSI protocol) is required, which FreeBSD is
lacking, as far as I know.
I see very similar behavior with my various Samsung T5 and T7 devices (these
are external SSDs). In Windows, the T5 delivers 500 MByte/s, and the T7 even
more if the port supports USB3 gen 2. In FreeBSD, I get only 100 to 150
MByte/s. Same machine, same port, same device. This is with copying large files
such as DVD images, so the IOPS and per-file overhead are negligible.
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