[ubuntu-za] File transfer speed

[Jan Greeff]

Thanks for the feedback Xandor.

Simply put, 50 GB files (photos) that take one hour to transfer from 
Ubuntu, take 30 hours from Windoze. The latter had an internet 
connection so if updates were necessary the door was open.

Is there a way that I can help Windows by finding out if it needs drivers?

Kind regards,

Jan

On 08/09/2016 09:31, Xandor Schiefer wrote:
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> More than likely, Ubuntu is showing you a transfer speed that counts
> "moving files into the disk cache *to be written when there's a nice gap
> for disk i/o*" in to the calculation of overall speed.
>
> It's likely not the speed that things are actually being written to
> disk. So that disk i/o doesn't unduly interrupt other computing tasks,
> the kernel usually fills up a disk cache and waits for an opportune
> moment to actually write what's in the cache to disk.
>
> This is why there's an "eject/safely remove/unmount" step we *should*
> take before removing removable media that has been written to recently.
> It's why if you eject very quickly after a transfer "finishes", you'll
> have to wait a bit, but if you did a transfer 10 minutes ago, ejecting
> will be nearly instant. There's the CLI command `sync` that will flush
> the disk cache to disk.
>
> It's also why, if you're doing a particularly large transfer, the speed
> seems really fast at first, and then slows down to a more stable rate.
> At first it's filling up the disk cache, and when that's full you're
> seeing a more realistic transfer rate.
>
> If you knew about all of that already, and you're confident that's not
> it, it could also be that your windows drivers aren't updated/the right
> kind for the connection/hardware and it is in a legacy or fallback mode.
>
> Kind regards,
>
>
> Xandor Schiefer
> +27 79 706 5620
>
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> On 08/09/2016 06:15, Jan Greeff wrote:
>> Good morning all,
>>
>> An interesting question to which I hope to receive even more interesting
>> replies.
>>
>> When I transfer files and folders to my external hard drive from my
>> Ubuntu system, the transfer rate runs at between 26 to 28 MBps.
>> When I transfer from the Windoze 7 installation on the same machine to
>> the same drive, the transfer rate is less than 1 MBps.
>>
>> Why the massive difference in transfer rates?
>>
>> Best wishes,
>>
>> Jan
>>
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