Date: Sun, 13 Oct 2024 15:39:45 +0000 From: bugzilla-noreply@freebsd.org To: usb@FreeBSD.org Subject: [Bug 247964] Low read throughput on Sandisk Extreme external SSD Message-ID: <bug-247964-19105-jEIgzeVlSJ@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-247964-19105@https.bugs.freebsd.org/bugzilla/> References: <bug-247964-19105@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D247964 Oliver Fromme <olli@FreeBSD.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |olli@FreeBSD.org --- 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 kn= ow, 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 f= iles such as DVD images, so the IOPS and per-file overhead are negligible. --=20 You are receiving this mail because: You are the assignee for the bug.=
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