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Linux performance on a 8255 custom board

DISCUSSION Ricardo Scop 1 participant 1 message Dec 13, 2001

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Ricardo Scop

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Hi all,

We've run LmBench in our MPC8255 custom board running a recent linuxppc_2_4 revision (2.4.16). CPU frequency is 132 MHz, bus @ 33 MHz and we don't have L2 cache.

The results are presented bellow, for comparison. We are particularly interesting in knowing how our memory latencies and related figures (context switching, for example) are compared to other board's.

Thanks in advance,

Ricardo Scop mailto:[email protected]
R SCOP Consult.

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"Don't hate, it's too big a burden to bear."
~Martin Luther King Jr.
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L M B E N C H 2 . 0 S U M M A R Y
------------------------------------

Basic system parameters
----------------------------------------------------
Host OS Description Mhz

--------- ------------- ----------------------- ----
nr2g Linux 2.4.16 ppc 132

Processor, Processes - times in microseconds - smaller is better
----------------------------------------------------------------
Host OS Mhz null null open selct sig sig fork exec sh
call I/O stat clos TCP inst hndl proc proc proc
--------- ------------- ---- ---- ---- ---- ---- ----- ---- ---- ---- ---- ----
nr2g Linux 2.4.16 132 1.70 3.51 16.5 23.7 212.8 6.94 23.8 3888 28.K 65.K

Context switching - times in microseconds - smaller is better
-------------------------------------------------------------
Host OS 2p/0K 2p/16K 2p/64K 8p/16K 8p/64K 16p/16K 16p/64K
ctxsw ctxsw ctxsw ctxsw ctxsw ctxsw ctxsw
--------- ------------- ----- ------ ------ ------ ------ ------- -------
nr2g Linux 2.4.16 1.310 259.1 893.1 272.0 902.5 275.9 907.7

*Local* Communication latencies in microseconds - smaller is better
-------------------------------------------------------------------
Host OS 2p/0K Pipe AF UDP RPC/ TCP RPC/ TCP
ctxsw UNIX UDP TCP conn
--------- ------------- ----- ----- ---- ----- ----- ----- ----- ----
nr2g Linux 2.4.16 1.310 45.0 89.3 600.5 873.6 2706

File & VM system latencies in microseconds - smaller is better
--------------------------------------------------------------

Host                 OS   0K File      10K File      Mmap    Prot    Page
                        Create Delete Create Delete  Latency Fault   Fault
--------- ------------- ------ ------ ------ ------  ------- -----   -----

nr2g Linux 2.4.16 3484.3 2325.6 18.2K 3571.4 1.334 1211.0

*Local* Communication bandwidths in MB/s - bigger is better
-----------------------------------------------------------
Host OS Pipe AF TCP File Mmap Bcopy Bcopy Mem Mem
UNIX reread reread (libc) (hand) read write
--------- ------------- ---- ---- ---- ------ ------ ------ ------ ---- -----
nr2g Linux 2.4.16 28.2 16.1 8.72 24.7 65.2 33.4 33.4 65.2 57.7

Memory latencies in nanoseconds - smaller is better
(WARNING - may not be correct, check graphs)
---------------------------------------------------

Host                 OS   Mhz  L1 $   L2 $    Main mem    Guesses
--------- -------------  ---- ----- ------    --------    -------

nr2g Linux 2.4.16 132 15.2 397.1 409.8 No L2 cache?

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