Re: LMbench2.0 results

From: Paolo Ciarrocchi (ciarrocchi@linuxmail.org)
Date: Sat Sep 07 2002 - 13:09:37 EST

From: Andrew Morton <akpm@digeo.com>

> Paolo Ciarrocchi wrote:
> >
> > Hi all,
> > I've just ran lmbench2.0 on my laptop.
> > Here the results (again, 2.5.33 seems to be "slow", I don't know why...)
> >
>
> The fork/exec/mmap slowdown is the rmap overhead. I have some stuff
> which partialy improves it.
>
> The many-small-file-create slowdown is known but its cause is not.
> I need to get oprofile onto it.
Let me know if do something usefull for you.
Now I compiled the 2.5.33 with _NO_ preemption (the x tagged kernel).
Performance are better, but it still "slow".

cd results && make summary percent 2>/dev/null | more
make[1]: Entering directory `/usr/src/LMbench/results'

                 L M B E N C H 2 . 0 S U M M A R Y
                 ------------------------------------

Basic system parameters
----------------------------------------------------
Host OS Description Mhz
                                                    
--------- ------------- ----------------------- ----
frodo Linux 2.4.18 i686-pc-linux-gnu 797
frodo Linux 2.4.19 i686-pc-linux-gnu 797
frodo Linux 2.5.33 i686-pc-linux-gnu 797
frodo Linux 2.5.33x i686-pc-linux-gnu 797

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
--------- ------------- ---- ---- ---- ---- ---- ----- ---- ---- ---- ---- ----
frodo Linux 2.4.18 797 0.40 0.56 3.18 3.97 1.00 3.18 115. 1231 13.K
frodo Linux 2.4.19 797 0.40 0.56 3.07 3.88 1.00 3.19 129. 1113 13.K
frodo Linux 2.5.33 797 0.40 0.61 3.78 4.76 1.02 3.37 201. 1458 13.K
frodo Linux 2.5.33x 797 0.40 0.60 3.51 4.38 1.02 3.27 159. 1430 13.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
--------- ------------- ----- ------ ------ ------ ------ ------- -------
frodo Linux 2.4.18 0.990 4.4200 13.8 6.2700 309.8 58.6 310.5
frodo Linux 2.4.19 0.900 4.2900 15.3 5.9100 309.6 57.7 309.9
frodo Linux 2.5.33 1.620 5.2800 15.3 9.3500 312.7 54.9 312.7
frodo Linux 2.5.33x 1.040 4.3200 17.8 7.6200 312.5 49.9 312.5

*Local* Communication latencies in microseconds - smaller is better
-------------------------------------------------------------------
Host OS 2p/0K Pipe AF UDP RPC/ TCP RPC/ TCP
                        ctxsw UNIX UDP TCP conn
--------- ------------- ----- ----- ---- ----- ----- ----- ----- ----
frodo Linux 2.4.18 0.990 4.437 8.66
frodo Linux 2.4.19 0.900 4.561 7.76
frodo Linux 2.5.33 1.620 6.497 9.11
frodo Linux 2.5.33x 1.040 4.888 8.70

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
--------- ------------- ------ ------ ------ ------ ------- ----- -----
frodo Linux 2.4.18 68.9 16.0 185.8 31.6 425.0 0.789 2.00000
frodo Linux 2.4.19 68.9 14.9 186.5 29.8 416.0 0.798 2.00000
frodo Linux 2.5.33 77.8 19.1 211.6 38.3 774.0 0.832 3.00000
frodo Linux 2.5.33x 77.2 18.8 206.7 37.0 769.0 0.823 3.00000

*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
--------- ------------- ---- ---- ---- ------ ------ ------ ------ ---- -----
frodo Linux 2.4.18 810. 650. 181.7 203.7 101.5 101.4 203. 195.3
frodo Linux 2.4.19 808. 680. 187.2 203.8 101.5 101.4 203. 190.1
frodo Linux 2.5.33 571. 636. 185.6 202.5 100.5 100.4 202. 190.3
frodo Linux 2.5.33x 768. 710. 185.4 202.5 100.5 100.4 202. 189.5

Memory latencies in nanoseconds - smaller is better
    (WARNING - may not be correct, check graphs)
---------------------------------------------------
Host OS Mhz L1 $ L2 $ Main mem Guesses
--------- ------------- ---- ----- ------ -------- -------
frodo Linux 2.4.18 797 3.767 8.7890 158.9
frodo Linux 2.4.19 797 3.767 8.7980 158.9
frodo Linux 2.5.33 797 3.798 8.8660 160.1
frodo Linux 2.5.33x 797 3.796 45.5 160.2
make[1]: Leaving directory `/usr/src/LMbench/results'

Hope it helps.

Ciao,
        Paolo 

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