From nobody Mon Sep 20 08:14:59 2021 X-Original-To: usb@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id D5BBE17CAB90 for ; Mon, 20 Sep 2021 08:14:59 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4HCcmg5gP8z3PVK for ; Mon, 20 Sep 2021 08:14:59 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2610:1c1:1:606c::50:1d]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 9F4495424 for ; Mon, 20 Sep 2021 08:14:59 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id 18K8Exkw008624 for ; Mon, 20 Sep 2021 08:14:59 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 18K8Ex5x008623 for usb@FreeBSD.org; Mon, 20 Sep 2021 08:14:59 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: usb@FreeBSD.org Subject: [Bug 247964] Low read throughput on Sandisk Extreme external SSD Date: Mon, 20 Sep 2021 08:14:59 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: usb X-Bugzilla-Version: CURRENT X-Bugzilla-Keywords: needs-qa, performance X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: gljennjohn@gmail.com X-Bugzilla-Status: Open X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: usb@FreeBSD.org X-Bugzilla-Flags: mfc-stable12? mfc-stable11? X-Bugzilla-Changed-Fields: cc Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated List-Id: FreeBSD List-Archive: https://lists.freebsd.org/archives/freebsd-usb List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-usb@freebsd.org X-BeenThere: freebsd-usb@freebsd.org MIME-Version: 1.0 X-ThisMailContainsUnwantedMimeParts: N https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D247964 Gary Jennejohn changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |gljennjohn@gmail.com --- Comment #2 from Gary Jennejohn --- (In reply to Tom Jones from comment #0) You don't state which USB version you're using, but based on the transfer speeds it must be USB3. Not all USB3 ports/external enclosures are created equal. Is it USB3.0, US= B3.1 or USB3.2? You don't state which USB3 versions your various computers supp= ort. For example, my FreeBSD box supports USB3.1 Gen 1 and, using the dd values = you provide, I get a transfer rate of 378MB/s from a 1TB Samsung SSD 870 EVO (w= hen I plug it in the USB stack reports 400MB/s transfers). When I plug this SSD into a Linux server, which only has USB3.0 support, I get only a 205MB/s transfer rate, while using the equivalent Linux dd command. So, don't blame FreeBSD alone. The USB3 hardware plays a big role in trans= fer rates. Note that the Linux server has a AMD 6-core 3.2GHz CPU and the FreeBSD box = has a Ryzen 7 3700X. But the CPU shouldn't a bottleneck for USB transfers. --=20 You are receiving this mail because: You are the assignee for the bug.=