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#apertus IRC Channel Logs

2020/08/07

Timezone: UTC


01:00
mumptai
left the channel
03:41
Bertl
off to bed now ... have a good one everyone!
03:41
Bertl
changed nick to: Bertl_zZ
05:16
BAndiT1983|away
changed nick to: BAndiT1983
06:58
fredy__
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06:59
fredy
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07:41
mumptai
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08:33
schmoggie1
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10:16
Dest123
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10:55
anuejn
some more experiments resulted in this plot: https://files.niemo.de/fifo_interface_idle.svg
10:56
anuejn
interestingly the "bursts" the ft601 accepts are always 2k in size
11:08
mumptai
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11:09
mumptai
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11:10
mumptai
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11:10
anuejn
when we force the burst size to 1k we get pretty exactly half the bandwidth
11:10
anuejn
(180Mbyte /s)
11:28
se6ast1an
anuejn: so this all seems to hint at 360MB/s being some kind of hard limit I assume?
11:36
vup
we think it has to do with the mode we are using, there are two modes: 245 and 600
11:37
vup
currently we are using the 245 mode, and this indeed looks like it might be kind of a hard limit in this mode
11:39
vup
however we think using the 600 mode it might be possible to get better performance, and one can then have multiple parallel channels, which means that even if the ft601 is busy sending the packets for one of the channels, it might accept new data on one of the other channels and thus decreasing the number of cycles we are not sending anything
11:41
anuejn
but we are not shure if it is worth the labour to put into that performance optimization
11:41
anuejn
even if we would get like 380 Mb/s that is not much more and probably quite some additional work
11:42
se6ast1an
I see
11:42
se6ast1an
sustainable 360MB/s is indeed a very good value for one plugin module
11:43
se6ast1an
which we could double by using 2
11:45
anuejn
ok so it would be sufficient for doing 16:9 4k 12bit 24fps (which is 339.7386 megabyte/s)
11:45
anuejn
so i think it is not worth the additional time investment
12:00
se6ast1an
agreed
12:01
se6ast1an
what steps are required to actually get video data to/from the usb3 plugin module?
12:01
se6ast1an
I assume it require zynq gateware changes as well
12:02
mumptai
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12:41
anuejn
probably
12:41
anuejn
and a working usb3 plugin
12:41
anuejn
and some gataware on the machxo
13:06
Dest123
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13:35
danieeel
changed nick to: danieel
13:38
anuejn
ft60x-rs should be usable now :)
13:38
anuejn
https://github.com/apertus-open-source-cinema/ft60x-rs
13:39
se6ast1an
great!
13:45
Bertl_zZ
changed nick to: Bertl
13:45
Bertl
morning folks!
13:48
se6ast1an
good day!
13:52
anuejn
morning :)
14:02
Dest123
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14:36
Dest123
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16:23
BAndiT1983
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18:54
Bertl
off for now ... bbl
18:54
Bertl
changed nick to: Bertl_oO
19:29
BAndiT1983|away
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19:57
illwieckz
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illwieckz
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21:32
Dest123
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21:49
BAndiT1983
changed nick to: BAndiT1983|away
22:32
Dest123
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23:29
mumptai
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