[mythtv-commits] Ticket #11252: Reduce DeviceReadBuffer thread wakeup

[MythTV]

#11252: Reduce DeviceReadBuffer thread wakeup
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 Reporter:  Rune Petersen <rune@…>  |          Owner:  danielk
     Type:  Patch - Feature         |         Status:  accepted
 Priority:  minor                   |      Milestone:  unknown
Component:  MythTV - General        |        Version:  0.26-fixes
 Severity:  medium                  |     Resolution:
 Keywords:                          |  Ticket locked:  0
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Comment (by danielk):

 Rune, I've made a modification similar to what you had for the Read call
 which reduces the number of times that call is made. However the change in
 the size of min_read goes against what we want to with those read, we want
 to get that data out of the very small OS buffers as quickly as possible
 hence the "// Limit read size for faster return from read" comment and the
 code following it. Also the min_read you set was larger than the
 dev_read_size when not using poll which doesn't make much sense to me.

 The streamhandler changes seemed harmless, but I didn't really see the
 point of them. Can you explain what you were doing there?

 PS How much overall CPU usage are you seeing with the Cortex-A9?
 Improvements are always welcome, but my backend CPU usage during tests was
 too low to be measurable here on my old Intel E8400.

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Ticket URL: <http://code.mythtv.org/trac/ticket/11252#comment:3>
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