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Property:do read pipe (procfs)

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Info
  
Name-Collision - multiple objects in this wiki use the name do_read_pipe!
do_read_pipe (bench) Result: MemBench Linear Read Benchmark.
do_read_pipe (procfs) Test: MemBench Linear Read Benchmark.

Procfs-Object

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Details

do_read_pipe is an open source RAM Benchmark by AVM which performs a Linear Read test (Load-Multiple).
Initially located at /proc/avm it was moved to /proc/avm/benchmark later. See the Path in the Model-Matrix.

This test reads from continous memory locations so it is CPU pipeline friendly.

do_read_pipe is part of the MemBench suite. For an overview of all tests see help (procfs) and the Benchmark article.

Excerpts from the test results (german):

6490 ATOM:
Lineares Lesen aus dem RAM

6490 ARM:
Burstartiges Lesen aus dem RAM unter Nutzung von load multiple.

7240 / 7390 / 7490 MIPS:
Lesen aus dem RAM mit optimaler Unterstuetzung der Pipline.
D.h. der Code ist gewaehlt, dass die Pipeline nicht geleert 
werden muss und so keine Zeit verschwendet wird. 

Excerpt from the source code avm_membench.c (german):

/*------------------------------------------------------------------------------------------*\
 * Pipeline-friendly Read
 *
 *  -16x 4-byte-Werte pro Schleifendurchlauf
 *      -> 16 Lesezugriffe pro Schleifendurchlauf
\*------------------------------------------------------------------------------------------*/

Examples

7530 fw 7.29 example:

root@fritz1:/var/mod/root# cat /proc/avm/benchmark/do_read_pipe

cat: read error: Cannot allocate memory

6490 fw 7.29 example - ATOM side:

root@fritz2:/var/mod/root# cat /proc/avm/benchmark/do_read_pipe

AVM-RAM-Benchmark
=============================================
IRQs: off (alle Tests mit deaktivierten IRQs)
CPU-Clock: 1200042000
RAM-Clock: 100000000 (eff. Datentaktrate)
BUS-Breite (Word=): 32 Bit
Measure-Time: 1 * 1.0s

-- Results --
=============================================================================
 type             ! total read ! loops ! DDR-Ticks ! 32Bit     !
                  !    in kb   !       ! /32Bit    ! Worte/s   ! kB/s
=============================================================================
read              !  554496    ! 1     !     0.704 ! 141950976 ! 554496
                  !            !       !           !           !
Lineares Lesen aus dem RAM
-----------------------------------------------------------------------------

6490 fw 7.29 example - ARM side:

root@fritz2:/var/mod/root# rpc cat /proc/avm/benchmark/do_read_extreme

AVM-RAM-Benchmark
=============================================
IRQs: off (alle Tests mit deaktivierten IRQs)
CPU-Clock: 450000000
RAM-Clock: 250000000 (eff. Datentaktrate)
BUS-Breite (Word=): 32 Bit
Measure-Time: 1 * 1.0s

 -- Results --
=============================================================================
 type             ! total read ! loops ! DDR-Ticks ! 32Bit     !
                  !    in kb   !       ! /32Bit    ! Worte/s   ! kB/s
=============================================================================
read              !  122304    ! 1     !     7.984 !  31309824 ! 122304
                  !            !       !           !           !
Burstartiges Lesen aus dem RAM unter Nutzung von load multiple.
-----------------------------------------------------------------------------

7490 fw 7.29 example:

fritz3:/var/mod/root $ cat /proc/avm/do_read_pipe

AVM-RAM-Benchmark
=============================================
IRQs: off (alle Tests mit deaktivierten IRQs)
CPU-Clock: 500000000
RAM-Clock: 500000000 (eff. Datentaktrate)
BUS-Breite (Word=): 16 Bit
Measure-Time: 1 * 1.0s

-- Results --
========================================================================================
 type             ! total read ! loops ! DDR-Ticks ! 16Bit     !        !  Stalls per  !
                  !    in kb   !       ! /16Bit    ! Worte/s   ! kB/s   !  Instruction !
========================================================================================
read              !  264192    ! 1     !     3.696 ! 135266304 ! 264192 !    7.958     !
Pipeline-friendly !            !       !           !           !        !              !
Lesen aus dem RAM mit optimaler Unterstuetzung der Pipline.    !        !              !
D.h. der Code ist gewaehlt, dass die Pipeline nicht geleert    !        !              !
werden muss und so keine Zeit verschwendet wird.               !        !              !
----------------------------------------------------------------------------------------

7390 fw 6.04 example:

root@7390:/var/mod/root# cat /proc/avm/do_read_pipe

AVM-RAM-Benchmark
=============================================
IRQs: off (alle Tests mit deaktivierten IRQs)
CPU-Clock: 500000000
RAM-Clock: 333333332 (eff. Datentaktrate)
BUS-Breite (Word=): 32 Bit
Measure-Time: 1 * 1.0s

-- Results --
=============================================================================
 type             ! total read ! loops ! DDR-Ticks ! 32Bit   !
                  !    in kb   !       ! /32Bit    ! Worte/s ! kB/s
=============================================================================
read              !  145472    ! 1     !     8.950 ! 37240832 ! 145472
Pipeline-friendly !            !       !           !         !
Lesen aus dem RAM mit optimaler Unterstuetzung der Pipline.  !
D.h. der Code ist gewaehlt, dass die Pipeline nicht geleert  !
werden muss und so keine Zeit verschwendet wird.             !
-----------------------------------------------------------------------------

7240 fw 6.06 example:

root@fritz:/var/mod/root# cat /proc/avm/do_read_pipe

AVM-RAM-Benchmark
=============================================
IRQs: off (alle Tests mit deaktivierten IRQs)
CPU-Clock: 360000000
RAM-Clock: 120000000 (eff. Datentaktrate)
BUS-Breite (Word=): 16 Bit
Measure-Time: 1 * 1.0s

-- Results --
=============================================================================
 type             ! total read ! loops ! DDR-Ticks ! 16Bit   !
                  !    in kb   !       ! /16Bit    ! Worte/s ! kB/s
=============================================================================
read              !  133056    ! 1     !     1.761 ! 68124672 ! 133056
Pipeline-friendly !            !       !           !         !
Lesen aus dem RAM mit optimaler Unterstuetzung der Pipline.  !
D.h. der Code ist gewaehlt, dass die Pipeline nicht geleert  !
werden muss und so keine Zeit verschwendet wird.             !
-----------------------------------------------------------------------------

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