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Date: Sun, 22 Apr 2007 16:22:16 +0200 From: Willy Tarreau <w@....eu> To: Con Kolivas <kernel@...ivas.org> Cc: ck@....kolivas.org, Michael Gerdau <mgd@...hnosis.de>, Nick Piggin <npiggin@...e.de>, Gene Heskett <gene.heskett@...il.com>, Al Boldi <a1426z@...ab.com>, Bill Huey <billh@...ppy.monkey.org>, Mike Galbraith <efault@....de>, linux kernel mailing list <linux-kernel@...r.kernel.org>, William Lee Irwin III <wli@...omorphy.com>, Peter Williams <pwil3058@...pond.net.au>, Matt Mackall <mpm@...enic.com> Subject: Re: [ck] Re: [ANNOUNCE] Staircase Deadline cpu scheduler version 0.45 On Sun, Apr 22, 2007 at 10:18:32PM +1000, Con Kolivas wrote: > On Sunday 22 April 2007 21:42, Con Kolivas wrote: > > Willy I'm still investigating the idle time and fluctuating load as a separate > issue. Is it possible the multiple ocbench processes are naturally > synchronising and desynchronising and choosing to sleep and/or run at the > same time? I can remove the idle time entirely by running ocbench at nice 19 > which means they are all forced to run at basically the same time by the > scheduler. > > Anyway the more important part is... Can you test this patch please? Dump > all the other patches I sent you post 045. Michael, if you could test too > please? OK, it's better now. All tasks equally run. X is still somewhat jerky, even at nice -19. I'm sure it happens when it's waiting in the other array. We should definitely manage to get rid of this if we want to ensure low latency. Just FYI, the idle is often close to zero and the load is often close to 30, even if still fluctuating : procs memory swap io system cpu r b w swpd free buff cache si so bi bo in cs us sy id 22 0 0 0 922876 6472 57848 0 0 0 0 164 3275 34 58 8 14 0 0 0 922648 6472 57864 0 0 0 0 8 383 37 63 0 24 0 0 0 922580 6472 57864 0 0 0 128 32 219 34 66 0 13 0 1 0 922524 6472 57864 0 0 0 0 0 393 35 64 0 31 0 0 0 922524 6472 57864 0 0 0 0 3 338 37 63 0 56 0 0 0 922556 6472 57864 0 0 0 0 0 290 35 65 0 57 0 1 0 922556 6472 57864 0 0 0 0 1 288 33 55 11 45 0 0 0 922556 6472 57864 0 0 0 0 1 255 27 52 21 38 0 0 0 922564 6472 57864 0 0 0 0 0 161 24 49 27 0 0 0 0 922564 6472 57864 0 0 0 0 1 142 23 40 38 0 0 0 0 922564 6472 57864 0 0 0 0 2 182 29 55 16 22 0 0 0 922564 6472 57864 0 0 0 0 1 253 28 48 24 26 0 0 0 922564 6472 57864 0 0 0 0 1 212 31 60 9 27 0 0 0 922564 6472 57864 0 0 0 0 1 314 31 70 0 44 0 0 0 922564 6472 57864 0 0 0 0 2 282 32 62 6 54 0 1 0 922564 6472 57864 0 0 0 0 26 213 32 67 1 42 0 0 0 922564 6472 57864 0 0 0 0 142 278 34 61 4 35 0 0 0 922564 6472 57864 0 0 0 0 58 226 39 61 0 6 0 0 0 922564 6472 57864 0 0 0 0 79 228 35 65 0 5 0 0 0 922564 6472 57864 0 0 0 0 98 225 36 61 3 35 0 1 0 922564 6472 57864 0 0 0 0 71 205 22 41 36 Hoping this helps ! Willy - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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