Date: Sat, 6 Jan 2018 21:25:06 -0700 From: Warner Losh <imp@bsdimp.com> To: blubee blubeeme <gurenchan@gmail.com> Cc: "O'Connor, Daniel" <darius@dons.net.au>, gljennjohn@gmail.com, FreeBSD current <freebsd-current@freebsd.org> Subject: Re: USB stack Message-ID: <CANCZdfomep_7MxOttAUXxN8a73sFsyKXvvc_TJ6jXad77ZBSbw@mail.gmail.com> In-Reply-To: <CALM2mEmmPeawLbKgkRf=bMo2W3d4OzmNY3cjmVAReE3C60nmLQ@mail.gmail.com> References: <CALM2mEmZFP9dGOivJknrCaaa-K1cSxNTTEV%2B8XCMpoZp-xcbqQ@mail.gmail.com> <1FD1FE97-D25C-4BAC-A3E0-F22509FB0C2B@dons.net.au> <CALM2mE=7cKcPzJ=-bVvmHez2inrAqJsuMaW%2BUZZtXesB3pzDtQ@mail.gmail.com> <6A4FF1B9-D98B-4E73-9E3E-E951749E0C21@dons.net.au> <20180104092349.2821f9f9@ernst.home> <18F01F2F-8907-4CF8-A80A-B6B5C16593B7@dons.net.au> <CALM2mE=uFK0BVqxFcrU_K%2BN%2BwYnu9VTewACeNqPTGYFEv93g4g@mail.gmail.com> <CALM2mEmX_3F1ivmT2gRKjenFQwf3mEbGzb%2BFx4KbuVzZsQ=LWA@mail.gmail.com> <CANCZdfobwBwEDwcX=sz17rVh8DugTbJPjG0q6HWcgkoT0sQ=CQ@mail.gmail.com> <CALM2mEmmPeawLbKgkRf=bMo2W3d4OzmNY3cjmVAReE3C60nmLQ@mail.gmail.com>
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On Sat, Jan 6, 2018 at 9:20 PM, blubee blubeeme <gurenchan@gmail.com> wrote= : > > > On Sun, Jan 7, 2018 at 12:17 PM, Warner Losh <imp@bsdimp.com> wrote: > >> >> >> On Sat, Jan 6, 2018 at 9:08 PM, blubee blubeeme <gurenchan@gmail.com> >> wrote: >> >>> On Sun, Jan 7, 2018 at 11:56 AM, blubee blubeeme <gurenchan@gmail.com> >>> wrote: >>> >>> > I ask does FreeBSD usb stack actually implements USB spec 2.0 or >>> greater >>> > and the topic gets derailed...? >>> > >>> > Are you guys saying that 7-8MB/s is USB speeds? >>> > >>> > On Thu, Jan 4, 2018 at 6:44 PM, O'Connor, Daniel <darius@dons.net.au> >>> > wrote: >>> > >>> >> >>> >> >>> >> > On 4 Jan 2018, at 09:23, Gary Jennejohn <gljennjohn@gmail.com> >>> wrote: >>> >> >> What is an "LG v30"? >>> >> >> >>> >> > It's a smartphone from LG and only supports USB2 speed. The >>> reported >>> >> > transfer rate is no big surprise. >>> >> >>> >> OK thanks. >>> >> >>> >> -- >>> >> Daniel O'Connor >>> >> "The nice thing about standards is that there >>> >> are so many of them to choose from." >>> >> -- Andrew Tanenbaum >>> >> GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C >>> >> >>> >> >>> > Actually, this post: https://forums.freebsd.org/threads/41041/ >>> >>> on the forum from 2013 pretty well describes what I am experiencing whe= n >>> moving data over USB. >>> >>> I have no problems hitting very high read/ write speeds using dd or >>> downloading something but copying by USB is excruciatingly slow. >>> >>> Why is that? >> >> >> If you are copying a boatload of tiny files to USB there's two issues. >> Both our UFS and MSDOS don't do well in this case. Second, for flash bas= ed >> USB thumbdrives, most of them have horrible write performance unless you >> buy quality drives... >> >> Warner >> > I would consider this=EF=BC=9A https://www.samsung.com/ > us/computing/memory-storage/memory-cards/micro-sd-evo- > 256gb-memory-card-w-adapter-mb-mc256da-am/ > 256GB Samsung microsd card quality. > At most, you can get 90MB/s read/write on this card. What are you seeing? And how are you copying? Warner
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