Behaviour of system tray bandwidth indicator

[Reindl Harald]

Am 20.03.2014 12:29, schrieb Patrick O'Callaghan:
> On Thu, 2014-03-20 at 11:54 +0100, Kevin Kofler wrote:
>> Patrick O'Callaghan wrote:
>>> I'm using Dolphin to copy large files (several GB) to an NFS-mounted
>>> NAS. This works fine except that the informational system tray pop-up is
>>> showing absurd values for the copy bandwidth. e.g. a 2GB file is
>>> declared to be finished when it's only just started. It looks like
>>> what's being measured is the rate of handoff to network buffers. This
>>> machine has a quad-core i7 CPU with 16GB of RAM and isn't doing much
>>> else, so the entire file could be copied to system buffers very quickly.
>>> However the actual LAN is 100Mbps so the real copy takes several
>>> minutes, and it's only then that I get the pop-up saying it's finished.
>>
>> The UI can only indicate what is visible to user space, it has no way to, 
>> nor is it expected to, know what the kernel does behind the scenes. If the 
>> kernel reports that it has processed the data, the UI shows it as processed. 
>> That is exactly as designed.
> 
> No doubt, however it's not how it's *read*. The interface could be
> clearer about what it's actually showing when the information is
> misleading.

how should it?

if you write 100 MB to disk and the kernel buffers it
from the application you are done, that's how any
modern operating system works for decades

if you don't want that behavior disable any caches and
buffers but then your machine will be as slow as hardware
years ago

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