[mythtv] Ticket #10414: HDHomeRun: Bad Recordings (was: Bad Recordings - Choppy Playback)

Gary Buhrmaster gary.buhrmaster at gmail.com
Sun Mar 11 01:41:39 UTC 2012

On Sun, Mar 11, 2012 at 00:44, Marc Randolph <mrand at pobox.com> wrote:
> Wow.  http://fasterdata.es.net/fasterdata/host-tuning/linux/ seems to
> suggest that values 10x smaller would be about good enough for a 10
> Gbps network, and that going overboard actually hurts performance.
> Wonder which site is right.

The ESNet site recommendations are targeted for a specific
type of application (TCP based bulk data transfers over longer
distances, with (recommended for best results) dedicated
high performance hosts) that are correct for that application.
If the buffers are "too big" or "too small" you can end up
creating some interesting issues in that targeted space.

For a local area network (on which most people are running
their MythTV systems) running UDP based applications,
some of the recommendations are going to be different.
Except for very memory limited systems, increasing the
rmem_max values modestly will not be a negative.  Note
that linux since an early 2.6 kernel has had TCP autotuning,
making many of the past adjustments unnecessary
(and sometimes harmful).

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