[mythtv-users] Optimizing rec./livetv tuner orders
warpme at o2.pl
Sat Jul 21 16:53:09 UTC 2012
On 7/21/12 5:08 PM, Michael T. Dean wrote:
> On 07/21/2012 11:03 AM, Michael T. Dean wrote:
>> On 07/20/2012 07:35 AM, warpme wrote:
>>> Hi *
>>> I have quick question regarding rec/livetv tuner orders optimization.
>>> Let assume we have 2 phy tuners (a,b) with 4 vritual each (1...4).
>>> I want to achieve: minimal rec-livetv collisions, best livetv
>>> availability, in case of resource races rec. should have priority
>>> over livetv.
>>> What setup will give meet above conditions with lowest scheduler load:
>>> tun_a1: 1,8
>>> tun_a2: 2,6
>>> tun_a3: 3,4
>>> tun_a4: 4,2
>>> tun_b1: 5,7
>>> tun_b2: 6,5
>>> tun_b3: 7,3
>>> tun_b4: 8,1
>>> tun_a1: 1,2
>>> tun_a2: 1,2
>>> tun_a3: 1,2
>>> tun_a4: 1,2
>>> tun_b1: 2,1
>>> tun_b2: 2,1
>>> tun_b3: 2,1
>>> tun_b4: 2,1
>>> Assuming, that for the same order value algorithm use tun_nr value
>>> for selection, it seems that for rec. order, case1 will result with
>>> the same scheduling order like case2. For livetv not.
>>> But functionally, I think, both cases will offer exactly the same
>>> user experience.
>>> Has case2 any sched. performance gains over case1 ?
>> Never, ever, do case 1. It will completely break multirec (meaning
>> you'll record things from the same multiplex using different physical
>> tuners). This is why the UI only allows you to set the schedule
>> order or Live TV order on the capture card--not the individual
>> virtual tuners.
>> Case 2 is what you want--or something along that line, but with more
>> physical tuners (as with only 2, the likelihood of recordings
>> preventing you from being able to "own" a tuner for Live TV is very
> Actually, now that I look at it, again, case 1 is identical to case 2
> for recordings--I had misread it, thinking it was the broken
> configuration where people were alternating virtual tuner order.
> That said, you want case 2, still. It will result in a
> far-more-efficient allocation of tuners for Live TV, resulting in
> fewer interruptions to Live TV usage (which is good, since the popup
> that says that the tuner is required for Live TV is broken and
> generally causes problems to both Live TV and recordings). And, use
> the UI to set it up, don't hack the DB.
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> mythtv-users at mythtv.org
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