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Subject[BENCHMARK] 2.5.59 IPC effects of nmi_watchdog and noapic
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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