[mythtv-commits] Ticket #11756: Slow reads and writes

MythTV noreply at mythtv.org
Sun Aug 18 22:40:19 UTC 2013


#11756: Slow reads and writes
--------------------------------------------+------------------------------
 Reporter:  Craig Treleaven <ctreleaven@…>  |          Owner:
     Type:  Bug Report - General            |         Status:
 Priority:  minor                           |  infoneeded_new
Component:  Ports - OSX                     |      Milestone:  unknown
 Severity:  medium                          |        Version:  0.26-fixes
 Keywords:                                  |     Resolution:
                                            |  Ticket locked:  0
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Comment (by tahoward@…):

 I'm seeing the same thing on a machine I just upgraded from 0.22-svn to
 0.26-fixes.  This happens with recordings from a PVR-500 and from an HD
 Homerun.  I also see artifacts (rectangles) in the video around the times
 when it happens, and recordings exported with nuvexport get progressively
 out of sync, with audio about 30 seconds behind video after an hour.  I'm
 using a sata drive, and these are a few stats from hdparm and dd:

 [root at motion mythtv]# hdparm -tT /dev/mapper/VolGroup00-MediaRoot

 /dev/mapper/VolGroup00-MediaRoot:
  Timing cached reads:   6968 MB in  2.00 seconds = 3487.73 MB/sec
  Timing buffered disk reads:  134 MB in  3.06 seconds =  43.83 MB/sec
 [root at motion mythtv]# dd if=/dev/random of=/var/lib/mythvideo/t/test.img
 bs=8k count=256k

 [root at motion mythtv]# dd if=/dev/zero of=/var/lib/mythvideo/t/test.img
 bs=8k count=256k
 262144+0 records in
 262144+0 records out
 2147483648 bytes (2.1 GB) copied, 54.3988 s, 39.5 MB/s

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Ticket URL: <http://code.mythtv.org/trac/ticket/11756#comment:7>
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