Date: Mon, 2 Jan 2017 12:59:49 +0300 From: "Marat N.Afanasyev" <amarat@li.ru> To: Ian Smith <smithi@nimnet.asn.au> Cc: FreeBSD stable <freebsd-stable@freebsd.org> Subject: Re: usb 3.0 thumb drive speed limit Message-ID: <586A2495.5030301@li.ru> In-Reply-To: <20170102202711.G26979@sola.nimnet.asn.au> References: <586A0F05.6050504@li.ru> <20170102202711.G26979@sola.nimnet.asn.au>
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[-- Attachment #1 --] Ian Smith wrote: > On Mon, 2 Jan 2017 11:27:49 +0300, Marat N.Afanasyev wrote: > > I wonder is there a speed limit on usb 3.0? I've bought > > > > ugen0.4: <SanDisk> at usbus0 > > umass2 on uhub7 > > umass2: <SanDisk Extreme, class 0/0, rev 2.10/0.10, addr 4> on usbus0 > > da2 at umass-sim2 bus 2 scbus9 target 0 lun 0 > > da2: <SanDisk Extreme 0001> Removable Direct Access SPC-4 SCSI device > > da2: Serial Number AA010808161609220143 > > da2: 40.000MB/s transfers > > da2: 59840MB (122552320 512 byte sectors) > > da2: quirks=0x2<NO_6_BYTE> > > > > that claims 'Up to 245 MBytes/sec read speed' > > > > and dd shows: > > > > % dd if=/dev/da2 of=/dev/null bs=1m count=1000 > > 1000+0 records in > > 1000+0 records out > > 1048576000 bytes transferred in 25.688997 secs (40818098 bytes/sec) > > > > why we have such a limit? > > Seems you've plugged it into a USB 2 port, not USB 3 > > At least you're getting full USB 2 performance (40MB/s) > > Check if you have one or more USB 3 ports with 'dmesg | grep xhci' > > cheers, Ian > _______________________________________________ > freebsd-stable@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" > afair, single usb 2.0 device can be as fast as 240 Mbits/sec, not 320 Mbits/sec: % dd if=/dev/da2 of=/dev/null bs=1m count=1000 1000+0 records in 1000+0 records out 1048576000 bytes transferred in 34.026227 secs (30816699 bytes/sec) it's the same drive in usb 2.0 port And I do have usb 3.0: % grep xhci /var/run/dmesg.boot xhci0: <XHCI (generic) USB 3.0 controller> mem 0xfeaf8000-0xfeafffff irq 17 at device 0.0 on pci5 xhci0: 64 bytes context size, 64-bit DMA usbus0 on xhci0 xhci0: <XHCI (generic) USB 3.0 controller> mem 0xfeaf8000-0xfeafffff irq 17 at device 0.0 on pci5 xhci0: 64 bytes context size, 64-bit DMA usbus0 on xhci0 and I tried this thumb drive is in usb 3.0 port first, of course. -- SY, Marat [-- Attachment #2 --] 0 *H 010 `He 0 *H 00͠U]?Bg0 *H 0u1 0 UIL10U StartCom Ltd.1)0'U StartCom Certification Authority1#0!UStartCom Class 1 Client CA0 160828143630Z 191128143630Z0410U amarat@li.ru10 *H amarat@li.ru0"0 *H 0 2 "ypw (j& K`֛Q]JW r ucf \? 2:,quԌ,gO3')Kߛfg _}#μt hY`<of'~hGT 0e^('Lg}~ukIY`َkǂ I^<*cNDktmB0^W ]A | 0O,gp 00U 0 U %0++0 U 0 0 U l0QltYk0 U #0$l9aIF+('Hmh0o+c0a0$+0http://ocsp.startssl.com09+0-http://aia.startssl.com/certs/sca.client1.crt08U 10/0-+)'http://crl.startssl.com/sca-client1.crl0U 0 amarat@li.ru0#U 0http://www.startssl.com/0GU @0>0< +70-0++ https://www.startssl.com/policy0 *H .FUB@:(e@eۋHԩgx<,ޢs4XOި;sE 1Y"@jhCtuf]Z`@x*O,F@ Kk= 00nC9 y >Rx_!V3_ 9e ӯ)-,gRmP~FQx%#EjUEᶔK'LoMO꽕 <bw PT"ӎR00ʠk} Q Y0 *H 0}1 0 UIL10U StartCom Ltd.1+0)U "Secure Digital Certificate Signing1)0'U StartCom Certification Authority0 151216010005Z 301216010005Z0u1 0 UIL10U StartCom Ltd.1)0'U StartCom Certification Authority1#0!UStartCom Class 1 Client CA0"0 *H 0 }â}[[_ u$Wy5 |̔ vnqY)\aL$dYG|B"QǤĩVD#'F k9O_]*ςz_kU.u3r #:C<ogT )K Xah8v[\KqdlO)3+u7J5";[vfL/"2ϩJ# 4ד[U TB,a˖a 7H< =q d0`0U 0 U %0++0U 0 02U +0)0'%#!http://crl.startssl.com/sfsca.crl0f+Z0X0$+0http://ocsp.startssl.com00+0$http://aia.startssl.com/certs/ca.crt0 U $l9aIF+('Hmh0 U #0N @[i04hCA0?U 80604U 0,0*+ http://www.startssl.com/policy0 *H [#'#4pnR ۡЗN⛭`]K"#H*߷Թψ;UA8 Ҟeg{ozmYE60A )wXRK6c^-Al^ k[':G=;oLv{$B5;8b,ZP4{o[-j m)[땭[4 s.c|ҴvYLJ<|ӯgu0jD2 @hl+:j\ze_ևa@HyMHINxpK?% 㤺RC:=?^&7m´) A2;E~V B1$EvcKj؝(OoپU`"$a;ҡj0$&<$ۊ+/xjzb,7}W*1ܺ tDv#8K %^P>/i?)yRuQg^z`~sP91000u1 0 UIL10U StartCom Ltd.1)0'U StartCom Certification Authority1#0!UStartCom Class 1 Client CAU]?Bg0 `He 0 *H 1 *H 0 *H 1 170102095949Z0/ *H 1" !~Ze) {m? T0l *H 1_0]0 `He*0 `He0 *H 0*H 0 *H @0+0 *H (0 +7100u1 0 UIL10U StartCom Ltd.1)0'U StartCom Certification Authority1#0!UStartCom Class 1 Client CAU]?Bg0 *H 10u1 0 UIL10U StartCom Ltd.1)0'U StartCom Certification Authority1#0!UStartCom Class 1 Client CAU]?Bg0 *H cB`F 2 j*4͒SOwG6<B}ǎ wf? D$qIg^%̩ }4(p a$0 .hOxdTLN8ehULA eZr˿ F n$%T0S3gü? C#t2i})JAug(d|.H$rNQo_-gw5R:;p &<home | help
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