usb 3.0 thumb drive speed limit

[Marat N.Afanasyev]

Florian Ermisch wrote:
>
>
> Am 2. Januar 2017 10:59:49 MEZ, schrieb "Marat N.Afanasyev" <amarat at li.ru>:
>> 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
>>>
>>>
>> 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.
>
> Are you running 10.x or 11.0?
>
> When was running 10.1 I only got
> ~27 MB/s out of each of my two
> external HDDs connected to the
> same USB3 port (two disk enclosure,
> speed according to `zpool iostat -v`
> AFAIR).
> They also attached as high-speed
> devices.
> Some time after upgrading to the
> than current 11-CURRENT I've
> noticed kernel messages mentioning
> 400 MB/s instead of 40 MB/s and
> quite an improvement in throughput.
>
> May be a quirk in the driver for your
> paricular XHCI chip.
>
> Regards, Florian
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11.0

I think that i have somehow buggy addon card :(

-- 
SY, Marat

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