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Ingo Molnar b47e8608a0 [PATCH] sched: increase SCHED_LOAD_SCALE_FUZZ 
increase SCHED_LOAD_SCALE_FUZZ that adds a small amount of
over-balancing: to help distribute CPU-bound tasks more fairly on SMP
systems.

the problem of unfair balancing was noticed and reported by Tong N Li.

10 CPU-bound tasks running on 8 CPUs, v2.6.23-rc1:

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 2572 mingo     20   0  1576  244  196 R  100  0.0   1:03.61 loop
 2578 mingo     20   0  1576  248  196 R  100  0.0   1:03.59 loop
 2576 mingo     20   0  1576  248  196 R  100  0.0   1:03.52 loop
 2571 mingo     20   0  1576  244  196 R  100  0.0   1:03.46 loop
 2569 mingo     20   0  1576  244  196 R   99  0.0   1:03.36 loop
 2570 mingo     20   0  1576  244  196 R   95  0.0   1:00.55 loop
 2577 mingo     20   0  1576  248  196 R   50  0.0   0:31.88 loop
 2574 mingo     20   0  1576  248  196 R   50  0.0   0:31.87 loop
 2573 mingo     20   0  1576  248  196 R   50  0.0   0:31.86 loop
 2575 mingo     20   0  1576  248  196 R   50  0.0   0:31.86 loop

v2.6.23-rc1 + patch:

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 2681 mingo     20   0  1576  244  196 R   85  0.0   3:51.68 loop
 2688 mingo     20   0  1576  244  196 R   81  0.0   3:46.35 loop
 2682 mingo     20   0  1576  244  196 R   80  0.0   3:43.68 loop
 2685 mingo     20   0  1576  248  196 R   80  0.0   3:45.97 loop
 2683 mingo     20   0  1576  248  196 R   80  0.0   3:40.25 loop
 2679 mingo     20   0  1576  244  196 R   80  0.0   3:33.53 loop
 2680 mingo     20   0  1576  244  196 R   79  0.0   3:43.53 loop
 2686 mingo     20   0  1576  244  196 R   79  0.0   3:39.31 loop
 2687 mingo     20   0  1576  244  196 R   78  0.0   3:33.31 loop
 2684 mingo     20   0  1576  244  196 R   77  0.0   3:27.52 loop

so they now nicely converge to the expected 80% long-term CPU usage.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-07-26 13:40:43 +02:00
..
acpi Pull auto-load-modules into release branch 2007-07-25 01:36:53 -04:00
asm-alpha take declarations of enable_irq() et.al. to linux/interrupt.h 2007-07-22 11:44:00 -07:00
asm-arm [BLOCK] Get rid of request_queue_t typedef 2007-07-24 09:28:11 +02:00
asm-arm26 take declarations of enable_irq() et.al. to linux/interrupt.h 2007-07-22 11:44:00 -07:00
asm-avr32 arch: personality independent stack top 2007-07-19 10:04:45 -07:00
asm-blackfin fbdev: detect primary display device 2007-07-17 10:23:11 -07:00
asm-cris arch: personality independent stack top 2007-07-19 10:04:45 -07:00
asm-frv arch: personality independent stack top 2007-07-19 10:04:45 -07:00
asm-generic i386: Put allocated ELF notes in read-only data segment 2007-07-19 10:04:47 -07:00
asm-h8300 take declarations of enable_irq() et.al. to linux/interrupt.h 2007-07-22 11:44:00 -07:00
asm-i386 [x86 setup] Make struct ist_info cross-architecture, and use in setup code 2007-07-25 12:02:21 -07:00
asm-ia64 Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6 2007-07-25 15:50:20 -07:00
asm-m32r [PATCH] sched: sched_cacheflush is now unused 2007-07-19 21:28:35 +02:00
asm-m68k take declarations of enable_irq() et.al. to linux/interrupt.h 2007-07-22 11:44:00 -07:00
asm-m68knommu m68knommu: fix reset register address casting 2007-07-25 11:05:01 -07:00
asm-mips [MIPS] Whitespace cleanup. 2007-07-24 16:02:47 +01:00
asm-parisc [PATCH] sched: sched_cacheflush is now unused 2007-07-19 21:28:35 +02:00
asm-powerpc [POWERPC] Provide ability to setup P2P bridge registers from struct resource 2007-07-23 22:30:08 -05:00
asm-ppc [POWERPC] Fix ARCH=ppc builds 2007-07-22 21:30:58 +10:00
asm-s390 [PATCH] sched: sched_cacheflush is now unused 2007-07-19 21:28:35 +02:00
asm-sh sh: intc - add support for SH7750 and its variants 2007-07-20 18:44:49 +09:00
asm-sh64 take declarations of enable_irq() et.al. to linux/interrupt.h 2007-07-22 11:44:00 -07:00
asm-sparc take declarations of enable_irq() et.al. to linux/interrupt.h 2007-07-22 11:44:00 -07:00
asm-sparc64 [SPARC64]: Convert parport to of_platform_driver. 2007-07-20 17:15:35 -07:00
asm-um arch: personality independent stack top 2007-07-19 10:04:45 -07:00
asm-v850 take declarations of enable_irq() et.al. to linux/interrupt.h 2007-07-22 11:44:00 -07:00
asm-x86_64 [x86 setup] Make struct ist_info cross-architecture, and use in setup code 2007-07-25 12:02:21 -07:00
asm-xtensa include/asm-xtensa/io.h must #include <asm/page.h> 2007-07-24 12:24:59 -07:00
crypto
keys
linux [PATCH] sched: increase SCHED_LOAD_SCALE_FUZZ 2007-07-26 13:40:43 +02:00
math-emu
media V4L/DVB (5835): saa7146/dvb-ttpci: Fix signedness warnings (gcc 4.1.1, kernel 2.6.22) 2007-07-18 14:24:44 -03:00
mtd UBI: kill homegrown endian macros 2007-07-18 16:53:49 +03:00
net Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/selinux-2.6 2007-07-19 14:42:40 -07:00
pcmcia
rdma
rxrpc
scsi [BLOCK] Get rid of request_queue_t typedef 2007-07-24 09:28:11 +02:00
sound [ALSA] version 1.0.14 2007-07-20 11:13:35 +02:00
video tgafb: actually allocate memory for the pseudo_palette 2007-07-17 10:23:12 -07:00
xen xen: Place vcpu_info structure into per-cpu memory 2007-07-18 08:47:45 -07:00
Kbuild