[BENCHMARK] 2.5.59 IPC effects of nmi_watchdog and noapic

From: Bill Davidsen (davidsen@tmr.com)
Date: Sat Jan 25 2003 - 20:26:25 EST

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After a great deal of disabling things which didn't work I got 2.5.59 up
on another test box, a BP6-based dual Celeron 500. I ran ctxbench to test
IPC speed, and it was much faster than previous kernels. In checking why I
noted that I had added nmi_watchdog=2 to the boot, because I have been
having hangs on some other machines (not 2.5 kernels).

After testing and retesting, I find that I get consistently different
results when I choose nmi_watchdog or noapic options. Results follow, the
benchmark is at http://www.unyuug.org/benchmarks/

This is an smp kernel without preempt, same kernel other than options
every time. "wd" is watchdog, "noapic" means what it says. the watchdog
value was 1 for noapic, 2 for normal. As always there is a lot of noise in
the results, since it is much lower for uni kernels I conclude it's real.
Feel free to disagree.

Someone might care to run pipe throughput or other benchmarks using these
options, I'm going to run some nosmp and then build a uni kernel.

Results follow:

================================================================
Run information
================================================================

Run: 2.5.59noapic-bl smp noapic
  CPU_MHz 497.941
  CPUtype Celeron (Mendocino)
  HostName bilbo.tmr.com
  KernelName 2.5.59
  Ncpu 2
Run: 2.5.59noapic_wd-bl smp noapic nmi_watchdog=1
  CPU_MHz 497.934
  CPUtype Celeron (Mendocino)
  HostName bilbo.tmr.com
  KernelName 2.5.59
  Ncpu 2
Run: 2.5.59smp-bl smp
  CPU_MHz 497.929
  CPUtype Celeron (Mendocino)
  HostName bilbo.tmr.com
  KernelName 2.5.59
  Ncpu 2
Run: 2.5.59smp2-bl smp (rerun)
  CPU_MHz 497.929
  CPUtype Celeron (Mendocino)
  HostName bilbo.tmr.com
  KernelName 2.5.59
  Ncpu 2
Run: 2.5.59smp3-bl smp (rerun)
  CPU_MHz 497.929
  CPUtype Celeron (Mendocino)
  HostName bilbo.tmr.com
  KernelName 2.5.59
  Ncpu 2
Run: 2.5.59smp_wd-bl smp nmi_watchdog=2
  CPU_MHz 497.922
  CPUtype Celeron (Mendocino)
  HostName bilbo.tmr.com
  KernelName 2.5.59
  Ncpu 2

================================================================
Results by IPC type
================================================================

                                   loops/sec
SIGUSR1 low high average avg/MHz
  2.5.59noapic-bl 27068 48728 38082 76.480
  2.5.59noapic_wd-bl 33028 41411 36015 72.330
  2.5.59smp-bl 21736 42077 32709 65.691
  2.5.59smp2-bl 16262 40249 27620 55.471
  2.5.59smp3-bl 26504 42152 32308 64.885
  2.5.59smp_wd-bl 49025 50449 49922 100.261

                                   loops/sec
message queue low high average avg/MHz
  2.5.59noapic-bl 46252 93817 64054 128.639
  2.5.59noapic_wd-bl 40314 93365 70843 142.275
  2.5.59smp-bl 63793 91828 80033 160.732
  2.5.59smp2-bl 61275 80361 69334 139.245
  2.5.59smp3-bl 41539 96881 60969 122.445
  2.5.59smp_wd-bl 44631 97161 64125 128.785

                                   loops/sec
pipes low high average avg/MHz
  2.5.59noapic-bl 34579 56118 43075 86.507
  2.5.59noapic_wd-bl 37042 53474 47074 94.540
  2.5.59smp-bl 38306 53524 44154 88.675
  2.5.59smp2-bl 54433 64747 59003 118.498
  2.5.59smp3-bl 45031 74383 56208 112.884
  2.5.59smp_wd-bl 42909 73304 62129 124.777

                                   loops/sec
semiphore low high average avg/MHz
  2.5.59noapic-bl 45534 73110 57987 116.455
  2.5.59noapic_wd-bl 51628 76640 66925 134.405
  2.5.59smp-bl 54480 77204 63339 127.206
  2.5.59smp2-bl 75281 97321 86829 174.382
  2.5.59smp3-bl 49455 101385 76107 152.849
  2.5.59smp_wd-bl 93467 102784 99541 199.914

                                   loops/sec
spin+yield low high average avg/MHz
  2.5.59noapic-bl 349412 568559 513582 1031.413
  2.5.59noapic_wd-bl 390338 576712 500901 1005.960
  2.5.59smp-bl 391388 555107 458790 921.397
  2.5.59smp2-bl 401141 554715 460878 925.591
  2.5.59smp3-bl 225217 533848 395736 794.764
  2.5.59smp_wd-bl 314654 502494 417260 838.003

                                   loops/sec
spinlock low high average avg/MHz
  2.5.59noapic-bl 1194120 1194518 1194297 2398.472
  2.5.59noapic_wd-bl 1194547 1194689 1194613 2399.139
  2.5.59smp-bl 1196577 1196784 1196698 2403.351
  2.5.59smp2-bl 1195373 1195661 1195560 2401.065
  2.5.59smp3-bl 1193938 1195470 1194803 2399.546
  2.5.59smp_wd-bl 1150615 1192710 1178607 2367.053

-- bill davidsen, CTO TMR Associates, Inc <davidsen@tmr.com> Having the feature freeze for Linux 2.5 on Hallow'een is appropriate, since using 2.5 kernels includes a lot of things jumping out of dark corners to scare you.

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Next message: Tom Sightler: "Re: 2.5.59-mm5 hangs on boot"
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