Date: Mon, 18 May 2020 13:39:22 +0000 From: bugzilla-noreply@freebsd.org To: usb@FreeBSD.org Subject: [Bug 244356] Writing to a USB 3.0 stick is very slow Message-ID: <bug-244356-19105-D0TVoRjHle@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-244356-19105@https.bugs.freebsd.org/bugzilla/> References: <bug-244356-19105@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D244356 --- Comment #49 from Olivier Certner <olivier.freebsd@free.fr> --- (In reply to Hans Petter Selasky from comment #46) Going to check the code of `usbtest` for what <Random> does exactly. > You'll get best performance with USB 2.0 using 64Kbyte transactions, and = for USB 3.0, 1 Mbyte and above. Thanks for the advice. It seems however that I cannot trigger transactions greater than 128KiB whatever method I use (`dd` to disk device, `dd` to sin= gle file, `cp`), and apparently some utilities lead to very small unoptimal transaction sizes (e.g., 4KiB when using `hd`). Do you know something simple that that could be changed to raise the transaction size? I fear this is related to the old MAXPHYS debate, in which case it won't be simple... --=20 You are receiving this mail because: You are the assignee for the bug.=
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