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SubjectRe: [RFC][PATCH RT 4/4 v2] sched/rt: Use IPI to trigger RT task push migration instead of pulling
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On Thu, 2012-12-13 at 14:53 -0500, Steven Rostedt wrote: 
> I didn't get a chance to test the latest IPI patch series on the 40 core
> box, and only had my 4 way box to test on. But I was able to test it
> last night and found some issues.
>
> The RT_PUSH_IPI doesn't get automatically set because just doing the
> sched_feat_enable() wasn't enough. Below is the corrected patch.
>
> Also, for some reason patch 3 caused the box to hang. Perhaps it

Yeah, I got to experience that, grabbed the wrong patch4, so didn't see
this warning, and got to fix the feature too :)

> required the RT_PUSH_IPI set, because it worked with the original patch
> series. But that series only did the push ipi. I removed it on the 40
> core before noticing that the RT_PUSH_IPI wasn't being automatically
> enabled.
>
> Here's an update of patch 4:
>
> sched/rt: Use IPI to trigger RT task push migration instead of pulling
>
> When debugging the latencies on a 40 core box, where we hit 300 to
> 500 microsecond latencies, I found there was a huge contention on the
> runqueue locks.

Makes a WEE bit of difference on my dainbramaged 64 core DL980, using a
SCHED_RR massive_intr 3 for 5 minutes as the bouncable load. This box
has only sched domains MC and CPU.. thinks it's a rather large laptop.

NO_RT_PUSH_IPI

T: 0 (14147) P:99 I:100 C:3059998 Min: 0 Act: 4 Avg: 3 Max: 368
T: 1 (14148) P:99 I:100 C:3059922 Min: 0 Act: 37 Avg: 3 Max: 372
T: 2 (14149) P:99 I:100 C:3059847 Min: 0 Act: 7 Avg: 3 Max: 361
T: 3 (14150) P:99 I:100 C:3059772 Min: 0 Act: 40 Avg: 2 Max: 346
T: 4 (14151) P:99 I:100 C:3059698 Min: 0 Act: 5 Avg: 2 Max: 307
T: 5 (14152) P:99 I:100 C:3059622 Min: 0 Act: 5 Avg: 2 Max: 379
T: 6 (14153) P:99 I:100 C:3059548 Min: 0 Act: 4 Avg: 3 Max: 341
T: 7 (14154) P:99 I:100 C:3059473 Min: 0 Act: 5 Avg: 4 Max: 379
T: 8 (14155) P:99 I:100 C:3059398 Min: 0 Act: 30 Avg: 5 Max: 552
T: 9 (14156) P:99 I:100 C:3059323 Min: 0 Act: 4 Avg: 3 Max: 760
T:10 (14157) P:99 I:100 C:3059248 Min: 0 Act: 3 Avg: 2 Max: 360
T:11 (14158) P:99 I:100 C:3059172 Min: 0 Act: 21 Avg: 4 Max: 583
T:12 (14159) P:99 I:100 C:3059097 Min: 0 Act: 4 Avg: 2 Max: 467
T:13 (14160) P:99 I:100 C:3059021 Min: 0 Act: 3 Avg: 2 Max: 350
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T:20 (14167) P:99 I:100 C:3058486 Min: 0 Act: 4 Avg: 6 Max: 567
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T:35 (14182) P:99 I:100 C:3057291 Min: 0 Act: 4 Avg: 3 Max: 447
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T:38 (14185) P:99 I:100 C:3057043 Min: 0 Act: 4 Avg: 5 Max: 408
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T:42 (14189) P:99 I:100 C:3056709 Min: 0 Act: 4 Avg: 4 Max: 445
T:43 (14190) P:99 I:100 C:3056625 Min: 0 Act: 4 Avg: 6 Max: 427
T:44 (14191) P:99 I:100 C:3056541 Min: 0 Act: 4 Avg: 4 Max: 501
T:45 (14192) P:99 I:100 C:3056457 Min: 0 Act: 4 Avg: 4 Max: 412
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T:51 (14198) P:99 I:100 C:3055949 Min: 0 Act: 4 Avg: 3 Max: 427
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T:54 (14201) P:99 I:100 C:3055693 Min: 0 Act: 3 Avg: 5 Max: 866
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T:58 (14205) P:99 I:100 C:3055348 Min: 0 Act: 2 Avg: 4 Max: 647
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T:61 (14208) P:99 I:100 C:3055088 Min: 0 Act: 4 Avg: 5 Max: 531
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T:63 (14210) P:99 I:100 C:3054914 Min: 0 Act: 4 Avg: 4 Max: 525

RT_PUSH_IPI

T: 0 (14065) P:99 I:100 C:3089627 Min: 1 Act: 3 Avg: 2 Max: 10
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T: 8 (14073) P:99 I:100 C:3089201 Min: 2 Act: 4 Avg: 3 Max: 11
T: 9 (14074) P:99 I:100 C:3089140 Min: 1 Act: 3 Avg: 4 Max: 43
T:10 (14075) P:99 I:100 C:3089093 Min: 2 Act: 3 Avg: 3 Max: 14
T:11 (14076) P:99 I:100 C:3089038 Min: 2 Act: 4 Avg: 3 Max: 11
T:12 (14077) P:99 I:100 C:3088982 Min: 2 Act: 3 Avg: 3 Max: 8
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