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DM8148 Encoder Memory Utilization Question

Shaun
Intellectual 330 points

I'm developing on the DM8148 using the TI_EZSDK_5_05_02_00. There is 512 MB's of memory available and I've followed the directions here to make all needed changes:

http://processors.wiki.ti.com/index.php/EZSDK_Memory_Map#Changing_Memory_Map_For_512MB_DM814x_Board

The board boots and I can load the provided FW(dm814x_hdvicp.xem3 and dm814x_hdvpss.xem3) and can successfully run the sample code (encode_a8host_debug and decode_a8host_debug).

Before I run the sample code, I see I have ~91MB of RAM left.

root@dm814x-evm:~# free
              total         used         free       shared      buffers
  Mem:       167948        76500        91448            0          852
 Swap:            0            0            0
Total:       167948        76500        91448
root@dm814x-evm:~#

 

However, after I run the sample code, I see I only have ~65 MB of RAM left.

root@dm814x-evm:/mnt/nfs# free
              total         used         free       shared      buffers
  Mem:       167948       102860        65088            0          852
 Swap:            0            0            0
Total:       167948       102860        65088

 

From my understanding, I thought the hardware uses memory that's been mapped elsewhere outside of the Linux kernel, such as IPC_SR_FRAME_BUFFERS. Why is there any memory taken from Linux? The encoded files are valid and play as expected.

Can someone help me figure this out?

Thanks!

  • 0
    TI__Guru* 80190 points

    Hello,

    cat /proc/meminfo

    echo 1 > /proc/sys/vm/drop_caches

    or

    echo 3 > /proc/sys/vm/drop_caches

    Are you playing OMX decode_display demo?

    BR

    Margarita

  • 0 in reply to Margarita Gashova
    Intellectual 330 points

    Hello,

    root@dm814x-evm:/mnt/nfs# cat /proc/meminfo
    MemTotal:         167948 kB
    MemFree:            4380 kB
    Buffers:             512 kB
    Cached:           107784 kB
    SwapCached:            0 kB
    Active:            21176 kB
    Inactive:          88280 kB
    Active(anon):      11372 kB
    Inactive(anon):      136 kB
    Active(file):       9804 kB
    Inactive(file):    88144 kB
    Unevictable:           0 kB
    Mlocked:               0 kB
    HighTotal:             0 kB
    HighFree:              0 kB
    LowTotal:         167948 kB
    LowFree:            4380 kB
    SwapTotal:             0 kB
    SwapFree:              0 kB
    Dirty:                12 kB
    Writeback:             0 kB
    AnonPages:          1188 kB
    Mapped:             1288 kB
    Shmem:             10348 kB
    Slab:               4612 kB
    SReclaimable:       1844 kB
    SUnreclaim:         2768 kB
    KernelStack:         392 kB
    PageTables:          176 kB
    NFS_Unstable:          0 kB
    Bounce:                0 kB
    WritebackTmp:          0 kB
    CommitLimit:       83972 kB
    Committed_AS:      32132 kB
    VmallocTotal:     729088 kB
    VmallocUsed:      239404 kB
    VmallocChunk:     468988 kB
    root@dm814x-evm:/mnt/nfs# echo 1 > /proc/sys/vm/drop_caches
    root@dm814x-evm:/mnt/nfs# cat /proc/meminfo
    MemTotal:         167948 kB
    MemFree:          101120 kB
    Buffers:              36 kB
    Cached:            11860 kB
    SwapCached:            0 kB
    Active:            12624 kB
    Inactive:            424 kB
    Active(anon):      11372 kB
    Inactive(anon):      136 kB
    Active(file):       1252 kB
    Inactive(file):      288 kB
    Unevictable:           0 kB
    Mlocked:               0 kB
    HighTotal:             0 kB
    HighFree:              0 kB
    LowTotal:         167948 kB
    LowFree:          101120 kB
    SwapTotal:             0 kB
    SwapFree:              0 kB
    Dirty:                12 kB
    Writeback:             0 kB
    AnonPages:          1188 kB
    Mapped:             1292 kB
    Shmem:             10348 kB
    Slab:               4304 kB
    SReclaimable:       1536 kB
    SUnreclaim:         2768 kB
    KernelStack:         392 kB
    PageTables:          176 kB
    NFS_Unstable:          0 kB
    Bounce:                0 kB
    WritebackTmp:          0 kB
    CommitLimit:       83972 kB
    Committed_AS:      32132 kB
    VmallocTotal:     729088 kB
    VmallocUsed:      239404 kB
    VmallocChunk:     468988 kB
    root@dm814x-evm:/mnt/nfs# free
                  total         used         free       shared      buffers
      Mem:       167948        67024       100924            0           44
     Swap:            0            0            0
    Total:       167948        67024       100924

    How come the program used so much cached memory?

    I'm using the OMX decode demo, not the decode_display demo.

    Thanks,

    Shaun