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PostPosted: Sat May 14, 2005 10:34 pm 
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Joined: Tue Dec 07, 2004 12:04 pm
Posts: 369
Under R5A15.1 upgraded with a PVR-350, a PVR-500 and ivtv 0.3.4q using analog cable (no external cable/sat box, no IR emitters). CPU is Athlon64 3400+, hard drive has DMA on.

I'm getting about 6-9 seconds between tuner changes, as evidenced here (from syslog):

Code:
May 14 23:05:18 mythtv-backend-1 kernel: saa7115: decoder set picture bright=127 contrast=63 saturation=63 hue=0
May 14 23:05:18 mythtv-backend-1 last message repeated 3 times
May 14 23:05:18 mythtv-backend-1 kernel: saa7115: decoder set size
May 14 23:05:18 mythtv-backend-1 kernel: ivtv: Allocate DMA stream 0 using 128 16384 byte buffers  2097152 kbytes total
May 14 23:05:19 mythtv-backend-1 kernel: saa7115: decoder disable output
May 14 23:05:19 mythtv-backend-1 kernel: saa7115: decoder enable output
May 14 23:05:27 mythtv-backend-1 kernel: saa7115: decoder set picture bright=130 contrast=63 saturation=63 hue=0
May 14 23:05:27 mythtv-backend-1 kernel: saa7115: decoder set picture bright=127 contrast=63 saturation=63 hue=0


and here:

Code:
...
May 14 23:01:14 mythtv-backend-1 kernel: cx25840: decoder disable output
May 14 23:01:14 mythtv-backend-1 kernel: cx25840: decoder enable output
May 14 23:01:20 mythtv-backend-1 kernel: cx25840: decoder set picture bright=127 contrast=63 saturation=63 hue=0
May 14 23:01:21 mythtv-backend-1 last message repeated 3 times



And about 5 seconds or so between channels using the up and down keys on the keyboard:

Code:
May 15 00:08:20 mythtv-backend-1 kernel: cx25840: decoder disable output
May 15 00:08:20 mythtv-backend-1 kernel: cx25840: decoder enable output
May 15 00:08:21 mythtv-backend-1 kernel: ivtv: Allocate DMA stream 0 using 128 16384 byte buffers  2097152 kbytes total
May 15 00:08:21 mythtv-backend-1 kernel: cx25840: decoder disable output
May 15 00:08:21 mythtv-backend-1 kernel: cx25840: decoder enable output
May 15 00:08:26 mythtv-backend-1 kernel: cx25840: decoder set picture bright=127 contrast=63 saturation=63 hue=0
May 15 00:08:26 mythtv-backend-1 last message repeated 3 times
May 15 00:08:26 mythtv-backend-1 kernel: cx25840: decoder disable output
May 15 00:08:26 mythtv-backend-1 kernel: cx25840: decoder enable output


This has been the case with the previous R5A12 as well.

Are these times as expected? If not, any ideas where I could begin to look (e.g. mythtv, ivtv, etc.) at fixing these?

-brendan


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PostPosted: Sat May 14, 2005 11:25 pm 
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Joined: Mon Oct 06, 2003 10:38 am
Posts: 4978
Location: Nashville, TN
between 3-5 seconds is normal some say that moving to a filesystem like XFS improves this as it can delete large files quicker. I don't really bother with tuner switches much, but I would imagine they add a bit of time on top of the normal channel change. I imagine if you search the mythtv mailing lists you'll find many discussions about this.

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