[Bug 197762] Re: file transfers on USB flash key (pendrive) or USB HDD are slowing down with time

[Theodore Ts'o]

>i had similar issues but also when i was trying to copy a file(around 50-700mb or larger) from my 
>local hdd to another folder of the same hdd!!!
>so what i found out was that this was happening only in files that i had downloaded with "transmission"!

What file system were you using on your hdd, and what version of Ubuntu
are you using?

This isn't surprising, because bittorrent downloads tend to write the
file in random order (depending on what is made available from the bt
seeders and the bt peers) and in multiple threads.   Using ext4 and a
relatively modern kernel, it won't be too bad, because ext4 has better
allocation algorithms than ext3.   It's best though, if the bt client
uses fallocate(), which is I'll bet what qbittorrent is doing.

So this is a useful bit of information, but I suspect some users have
different causes for their problems, which is one of the reasons why
most kernel developers have refused to use Launchpad.   Too many ubuntu
users are glomming onto a bug report, and they post different
performance problems all in a single bug report, without bothering to
give full information about their hardware, software versions, what file
system they are using, etc.   And then on top of that Launchpad is slow
as a dog when there it gets too long.

Which is why this bug is marked invalid and why I beg people, if they
have performance problems, to open new bugs and to give full details
about their hardware configuration, what version of Ubuntu they are
running, the exact specifics of the USB device, etc.   Otherwise this
can be a great place for people to vent, but most people who aren't paid
to pay attention to dysfunctional bug forums will simply say, "Beam me
up Scotty, there's no intelligent life here".

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file transfers on USB flash key (pendrive) or USB HDD are slowing down with time
https://bugs.launchpad.net/bugs/197762
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