[mythtv-users] Preventing a file transfer from saturating the network

[Neil Salstrom]

Wow.... Thanks for all the suggestions.  I guess I did leave out that
this was using a NFS share and simply copying the file from one to the
other (not using cp in a terminal).  I don't believe it's an issue
with hard drive read / write speed as I can watch a recorded (on disk)
program if a file transfer is occurring without problems.  It's only
if the HDHomerun is in use during the transfer.

If theoretical speed on a gigablit lan is 125 MB/s what is real world?
 According to the reported transfer rate across my network I'm hitting
up to ~110 MB/s then I add ~2 MB/s for the ATSC stream am I bumping up
against real world performance of my network?

Perhaps the easiest solution would be to pay attention to when I need
to transfer files!

Neil

On Tue, Dec 23, 2014 at 11:33 AM, Joseph Fry <joe at thefrys.com> wrote:
>
>
> On Tue, Dec 23, 2014 at 11:55 AM, Simon Hobson <linux at thehobsons.co.uk>
> wrote:
>>
>> Joseph Fry <joe at thefrys.com> wrote:
>>
>> > Both devices should get a Link Local address (169.254.x.x)
>> > automatically, so communication to the HDHR shouldn't be an issue (assuming
>> > your using the HDHR device name and not an IP in your mythtv device
>> > configuration, which it does by default)
>>
>> Or better still, configure an IP subnet on the link - I'm something of a
>> fan of deterministic setup !
>> Also it'll allow the roouting to be configured so that your PC/whatever on
>> the main lan can still access the HDHR. It just requires the Myth server to
>> have packet forwarding turned on, and to add a route for the subnet via the
>> Myth server's main LAN address.
>
>
> This would require running a DHCP server on the new subnet, or assigning the
> HDHR a static address.  I find Link Local to be far simpler if your just
> connecting two devices directly to one another.  Deterministic is great,
> except you will never actually use the HDHR's IP for anything, so why
> bother.
>
> The only issue I ever had with this was that sometimes linux can be slow to
> assign a link local address... but you can actually force link local in the
> network interface configuration and it's instant.
>
> Another thing to look at is the network connection itself.  An HDHR doesn't
> use that much bandwidth typically... not so much that you should see
> problems on a gigabit network, or even an 100Mbit.  You might have an issue
> with your computer connecting to the switch synchronously instead of async.
> This would effectively cut your bandwidth in half since it can only send or
> receive, not both.
>
> Finally... you may have cabling/interference issues (check for dropped
> frames).  Or maybe this would justifying an upgrade to a Gigabit switch (can
> get them dirt cheap these days).
>
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