lmbench results (with and without "kernel preemption") for Linux 2.6.8-rc4 on MPC 8275 (PQ2FADS-VR) ?
From: Povolotsky, Alexander
Date: Sat Oct 02 2004 - 09:04:26 EST
> Hi,
>
> Here are my lmbench results (with and without "kernel preemption") for
> Linux 2.6.8-rc4 on MPC 8275 (PQ2FADS-VR).
> Are results making any sense in your respected opinion ?
Is running lmbench once for each case (with and without "kernel preemption")
enough for making any reasonable
> conclusions (if not - how many times do you recommend to run it ? )
>
> Thanks,
> Alex Povolotsky
PS Configuration details are listed below the test results
> ***************
>
> /* kernel preemption is "off" */
> # ./lat_fs
> 0k 2 352 534
> 1k 2 311 657
> 4k 2 275 645
> 10k 2 192 635
>
> /* kernel preemption is "on" */
> # ./lat_fs
> 0k 33 6171 12039
> 1k 15 2701 4557
> 4k 12 2326 4585
> 10k 9 1534 3693
> *************************************
> /* kernel preemption is "off" */
> # ./lat_pipe
> Pipe latency: 29.3697 microseconds
>
> /* kernel preemption is "on" */
> # ./lat_pipe
> Pipe latency: 35.3225 microseconds
> *************************************
> /* kernel preemption is "off" */
> # ./lat_fifo
> Fifo latency: 29.9354 microseconds
>
> /* kernel preemption is "on" */
> # ./lat_fifo
> Fifo latency: 33.4318 microseconds
> *************************************
> /* kernel preemption is "off" */
> # ./lat_syscall read
> Simple read: 1.9111 microseconds
> # ./lat_syscall write
> Simple write: 2.3664 microseconds
> # ./lat_syscall stat ../../ACKNOWLEDGEMENTS
> Simple stat: 28.1538 microseconds
> # ./lat_syscall fstat ../../ACKNOWLEDGEMENTS
> Simple fstat: 4.0989 microseconds
> # ./lat_syscall open ../../ACKNOWLEDGEMENTS
> Simple open/close: 673.8750 microseconds
>
> /* kernel preemption is "on" */
> # ./lat_syscall read
> Simple read: 2.1007 microseconds
> # ./lat_syscall write
> Simple write: 1.6922 microseconds
> # ./lat_syscall stat ../../ACKNOWLEDGEMENTS
> Simple stat: 24.8492 microseconds
> # ./lat_syscall fstat ../../ACKNOWLEDGEMENTS
> Simple fstat: 5.0310 microseconds
> # ./lat_syscall open ../../ACKNOWLEDGEMENTS
> Simple open/close: 716.4286 microseconds
> *******************************************
> /* kernel preemption is "off" */
> # ./lat_proc fork
> Process fork+exit: 2281.0000 microseconds
> # ./lat_proc exec
> Process fork+execve: 13794.0000 microseconds
> # ./lat_proc shell
> Process fork+/bin/sh -c: 26913.0000 microseconds
>
> /* kernel preemption is "on" */
> # ./lat_proc fork
> Process fork+exit: 2349.3333 microseconds
> # ./lat_proc exec
> Process fork+execve: 2450.3333 microseconds
> # ./lat_proc shell
> Process fork+/bin/sh -c: 27038.0000 microseconds
> *****************************************8
> /* kernel preemption is "off" */
> # ./lat_sig install
> Signal handler installation: 4.0664 microseconds
> # ./lat_sig catch
> Signal handler overhead: 16.5183 microseconds
>
> /* kernel preemption is "on" */
> # ./lat_sig install
> Signal handler installation: 4.1338 microseconds
> # ./lat_sig catch
> Signal handler overhead: 18.3801 microseconds
> *************************************
> /* kernel preemption is "off" */
> ./lat_pagefault ../../ACKNOWLEDGEMENTS
> Pagefaults on ../../ACKNOWLEDGEMENTS: 8.1880 microseconds
>
> /* kernel preemption is "on" */
> ./lat_pagefault ../../ACKNOWLEDGEMENTS
> Pagefaults on ../../ACKNOWLEDGEMENTS: 8.3943 microseconds
> ******************************************
> /* kernel preemption is "off" */
> # ./lat_ops
> integer bit: 30.45 nanoseconds
> integer add: 30.39 nanoseconds
> integer mul: 39.88 nanoseconds
> integer div: 121.70 nanoseconds
> integer mod: 153.55 nanoseconds
> int64 bit: 51.74 nanoseconds
> int64 add: 61.48 nanoseconds
> int64 mul: 118.17 nanoseconds
> int64 div: 912.71 nanoseconds
> int64 mod: 809.03 nanoseconds
> float add: 50.09 nanoseconds
> float mul: 50.17 nanoseconds
> float div: 130.98 nanoseconds
> double add: 50.10 nanoseconds
> double mul: 55.25 nanoseconds
> double div: 202.25 nanoseconds
> float bogomflops: 216.12 nanoseconds
> double bogomflops: 292.37 nanoseconds
>
> /* kernel preemption is "on" */
> # ./lat_ops
> integer bit: 30.53 nanoseconds
> integer add: 30.40 nanoseconds
> integer mul: 39.92 nanoseconds
> integer div: 121.75 nanoseconds
> integer mod: 152.53 nanoseconds
> int64 bit: 52.20 nanoseconds
> int64 add: 61.07 nanoseconds
> int64 mul: 118.21 nanoseconds
> int64 div: 913.45 nanoseconds
> int64 mod: 802.58 nanoseconds
> float add: 50.14 nanoseconds
> float mul: 50.21 nanoseconds
> float div: 130.95 nanoseconds
> double add: 50.15 nanoseconds
> double mul: 55.29 nanoseconds
> double div: 202.18 nanoseconds
> float bogomflops: 216.32 nanoseconds
> double bogomflops: 292.68 nanoseconds
> ************************************
> /* kernel preemption is "off" */
> # ./bw_pipe
> Pipe bandwidth: 42.49 MB/sec
>
> /* kernel preemption is "on" */
> # ./bw_pipe
> Pipe bandwidth: 42.00 MB/sec
***********************************************
Test environment info (I and II) :
I) both kernel (after applying the patch) and lmbench are compiled on
windows under cygwin.
Here is the list of all fixes I used to make it "cygwin compilable" :
1) per http://sources.redhat.com/ml/crossgcc/2004-06/msg00282.html
Install patch from bertrand marquis <bertrand_marquis at yahoo dot fr>
listed there
--- linux-x86-2.6.7/scripts/kconfig/Makefile 2004-06-16 07:20:26.000000000
+0200
+++ linux-x86-2.6.7.cyg/linux-x86-2.6.7/scripts/kconfig/Makefile 2004-06-24
10:39:18.824400000 +0200
@@ -68,8 +68,8 @@
libkconfig-objs := zconf.tab.o
host-progs := conf mconf qconf gconf
-conf-objs := conf.o libkconfig.so
-mconf-objs := mconf.o libkconfig.so
+conf-objs := conf.o libkconfig.o
+mconf-objs := mconf.o zconf.tab.o
ifeq ($(MAKECMDGOALS),xconfig)
qconf-target := 1
@@ -89,11 +89,12 @@
endif
clean-files := libkconfig.so lkc_defs.h qconf.moc .tmp_qtcheck \
- .tmp_gtkcheck zconf.tab.c zconf.tab.h lex.zconf.c
+ .tmp_gtkcheck zconf.tab.c zconf.tab.h lex.zconf.c libkconfig.o
# generated files seem to need this to find local include files
HOSTCFLAGS_lex.zconf.o := -I$(src)
HOSTCFLAGS_zconf.tab.o := -I$(src)
+HOSTCFLAGS_libkconfig.o := -I$(src)
HOSTLOADLIBES_qconf = -L$(QTLIBPATH) -Wl,-rpath,$(QTLIBPATH) -l$(QTLIB) -ldl
HOSTCXXFLAGS_qconf.o = -I$(QTDIR)/include
@@ -101,6 +102,9 @@
HOSTLOADLIBES_gconf = `pkg-config gtk+-2.0 gmodule-2.0 libglade-2.0 --libs`
HOSTCFLAGS_gconf.o = `pkg-config gtk+-2.0 gmodule-2.0 libglade-2.0 --cflags`
+$(obj)/libkconfig.c: $(obj)/zconf.tab.c $(obj)/lex.zconf.c
+ cp $< $@
+
$(obj)/conf.o $(obj)/mconf.o $(obj)/qconf.o $(obj)/gconf.o:
$(obj)/zconf.tab.h
$(obj)/qconf.o: $(obj)/.tmp_qtcheck
2)download and install libelf package from:
http://www.gnu.org/directory/libs/misc/libelf.html
which provide <gelf.h>;
in /cygdrive/c/cygwin/usr/include you can then make an elf.h that just
contains
#include <gelf.h>
3)apply 2 patches from Martin Schaffner
http://mirror.vtx.ch/lfs/patches/downloads/linux/linux-2.6.7-build_on_case_i
nsensitive_fs-1.patch
http://mirror.vtx.ch/lfs/patches/downloads/linux/linux-2.6.7-build_on_osx-1.
patch
II) booting with RAMDISK from
<ftp://ftp.denx.de/pub/LinuxPPC/usr/src/SELF/images/
and then manually NFS mounting on /fadsroot (from Arabella)placed
on Red Hat Linux NFS server PC running
[release 9 (Shrike)Kernel 2.4.20-28.9 on an i686].
Lmbench is placed within fadsroot and is executed from there.
-
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