Subject: Re: 2.6.5 latencytest +aa5 +mm3 as/cfq scheduler
From: Redeeman <redeeman@metanurb.dk>
To: LKML Mailinglist <linux-kernel@vger.kernel.org>
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Date: Sun, 11 Apr 2004 10:27:32 +0200
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any information to bench this?

On Fri, 2004-04-09 at 23:47, Marcus Hartig wrote:
> Hello,
> 
> I've done some benchs with: 
> http://www.alsa-project.org/~iwai/alsa.html#LatencyTest
> 
> Test condition:
>    CPU load = 0.8
>    RTC freq = 1024
>    RTC wakeup count = 2
>    Deadline = 2
>    X-test = yes
>    Proc-test = yes
>    Disk-test = yes
>    Filesize = 1000000000
> 
> With the last stable kernel release 2.6.5 compared with -aa5 and -mm3 to 
> see which scheduler/kernel has a good or low latency.
> XP Barton 2800+, 512MB PC-333, Abit NF-S-V2 nForce2, SATA Maxtor 80GB, 
> ASUS 5700 FX. Fedora Core 1.91 test2, xorg-x11-0.6.6-0.2004_03_30.5, GNOME 
> 2.6, libata, reiserfs. Same .config as possible. All fresh booted in 
> init5, latencytest-0.5.2 running in each case from an xterm.
> 
> ---------- 2.6.5-mm3 CFQ scheduler ----------
> x11.log:
> cpu_hz = 2.08855e+09
> cpu_load=0.800000  loops per run = 645209
> total latency = 1.953125 ms
> cpu latency = 1.562500 ms
> max diff = 3.06087 ms (overrun 0)
> within 1ms = 39555, factor = 99.9798%
> within 2ms = 39563, factor = 100%
> deviation = 0.021617
> 
> proc.log:
> cpu_hz = 2.08855e+09
> cpu_load=0.800000  loops per run = 645240
> total latency = 1.953125 ms
> cpu latency = 1.562500 ms
> max diff = 3.02978 ms (overrun 0)
> within 1ms = 15406, factor = 99.9676%
> within 2ms = 15411, factor = 100%
> deviation = 0.0219986
> 
> diskwrite.log:
> cpu_hz = 2.08855e+09
> cpu_load=0.800000  loops per run = 645217
> total latency = 1.953125 ms
> cpu latency = 1.562500 ms
> max diff = 3.03607 ms (overrun 0)
> within 1ms = 15484, factor = 99.9548%
> within 2ms = 15491, factor = 100%
> deviation = 0.0451227
> 
> diskcopy.log:
> cpu_hz = 2.08855e+09
> cpu_load=0.800000  loops per run = 644828
> total latency = 1.953125 ms
> cpu latency = 1.562500 ms
> max diff = 3.0494 ms (overrun 0)
> within 1ms = 53058, factor = 99.9699%
> within 2ms = 53074, factor = 100%
> deviation = 0.0380116
> 
> diskread.log:
> cpu_hz = 2.08855e+09
> cpu_load=0.800000  loops per run = 645205
> total latency = 1.953125 ms
> cpu latency = 1.562500 ms
> max diff = 3.25948 ms (overrun 0)
> within 1ms = 37351, factor = 99.9304%
> within 2ms = 37377, factor = 100%
> deviation = 0.0339693
> 
> ---------- 2.6.5-mm3 AS scheduler ----------
> x11.log:
> cpu_hz = 2.08832e+09
> cpu_load=0.800000  loops per run = 645104
> total latency = 1.953125 ms
> cpu latency = 1.562500 ms
> max diff = 3.05296 ms (overrun 0)
> within 1ms = 38316, factor = 99.9791%
> within 2ms = 38324, factor = 100%
> deviation = 0.0216183
> 
> proc.log:
> cpu_hz = 2.08832e+09
> cpu_load=0.800000  loops per run = 645163
> total latency = 1.953125 ms
> cpu latency = 1.562500 ms
> max diff = 3.03901 ms (overrun 0)
> within 1ms = 15405, factor = 99.9546%
> within 2ms = 15412, factor = 100%
> deviation = 0.0223874
> 
> diskwrite.log:
> cpu_hz = 2.08832e+09
> cpu_load=0.800000  loops per run = 645114
> total latency = 1.953125 ms
> cpu latency = 1.562500 ms
> max diff = 3.06489 ms (overrun 0)
> within 1ms = 16688, factor = 99.9521%
> within 2ms = 16696, factor = 100%
> deviation = 0.0433707
> 
> diskcopy.log:
> cpu_hz = 2.08832e+09
> cpu_load=0.800000  loops per run = 644503
> total latency = 1.953125 ms
> cpu latency = 1.562500 ms
> max diff = 3.10258 ms (overrun 0)
> within 1ms = 38427, factor = 99.9662%
> within 2ms = 38440, factor = 100%
> deviation = 0.0456989
> 
> diskread.log:
> cpu_hz = 2.08832e+09
> cpu_load=0.800000  loops per run = 645152
> total latency = 1.953125 ms
> cpu latency = 1.562500 ms
> max diff = 3.44847 ms (overrun 0)
> within 1ms = 34704, factor = 99.928%
> within 2ms = 34729, factor = 100%
> deviation = 0.0357967
> 
> ---------- 2.6.5-aa5 AS scheduler ----------
> x11.log:
> cpu_hz = 2.08797e+09
> cpu_load=0.800000  loops per run = 645080
> total latency = 1.953125 ms
> cpu latency = 1.562500 ms
> max diff = 3.05035 ms (overrun 0)
> within 1ms = 39333, factor = 99.9797%
> within 2ms = 39341, factor = 100%
> deviation = 0.0215519
> 
> proc.log:
> cpu_hz = 2.08797e+09
> cpu_load=0.800000  loops per run = 644734
> total latency = 1.953125 ms
> cpu latency = 1.562500 ms
> max diff = 3.04263 ms (overrun 0)
> within 1ms = 15399, factor = 99.9675%
> within 2ms = 15404, factor = 100%
> deviation = 0.0220961
> 
> diskwrite.log:
> cpu_hz = 2.08797e+09
> cpu_load=0.800000  loops per run = 645054
> total latency = 1.953125 ms
> cpu latency = 1.562500 ms
> max diff = 3.08033 ms (overrun 0)
> within 1ms = 14817, factor = 99.9393%
> within 2ms = 14826, factor = 100%
> deviation = 0.0457863
> 
> diskcopy.log:
> cpu_hz = 2.08797e+09
> cpu_load=0.800000  loops per run = 645086
> total latency = 1.953125 ms
> cpu latency = 1.562500 ms
> max diff = 3.1242 ms (overrun 0)
> within 1ms = 38657, factor = 99.9586%
> within 2ms = 38673, factor = 100%
> deviation = 0.0395391
> 
> diskread.log:
> cpu_hz = 2.08797e+09
> cpu_load=0.800000  loops per run = 645088
> total latency = 1.953125 ms
> cpu latency = 1.562500 ms
> max diff = 3.42394 ms (overrun 0)
> within 1ms = 35125, factor = 99.926%
> within 2ms = 35151, factor = 100%
> deviation = 0.0341163
> 
> ---------- 2.6.5 AS scheduler ----------
> x11.log:
> cpu_hz = 2.08801e+09
> cpu_load=0.800000  loops per run = 645059
> total latency = 1.953125 ms
> cpu latency = 1.562500 ms
> max diff = 3.0537 ms (overrun 0)
> within 1ms = 39353, factor = 99.9771%
> within 2ms = 39362, factor = 100%
> deviation = 0.0218243
> 
> proc.log:
> cpu_hz = 2.08801e+09
> cpu_load=0.800000  loops per run = 645044
> total latency = 1.953125 ms
> cpu latency = 1.562500 ms
> max diff = 3.03839 ms (overrun 0)
> within 1ms = 15404, factor = 99.9416%
> within 2ms = 15413, factor = 100%
> deviation = 0.0226547
> 
> diskwrite.log:
> cpu_hz = 2.08801e+09
> cpu_load=0.800000  loops per run = 644705
> total latency = 1.953125 ms
> cpu latency = 1.562500 ms
> max diff = 4.51782 ms (overrun 4)
> within 1ms = 13287, factor = 99.9248%
> within 2ms = 13293, factor = 99.9699%
> deviation = 0.0516117
> 
> diskcopy.log:
> cpu_hz = 2.08801e+09
> cpu_load=0.800000  loops per run = 645081
> total latency = 1.953125 ms
> cpu latency = 1.562500 ms
> max diff = 4.09889 ms (overrun 1)
> within 1ms = 37387, factor = 99.9358%
> within 2ms = 37410, factor = 99.9973%
> deviation = 0.043017
> 
> diskread.log:
> cpu_hz = 2.08801e+09
> cpu_load=0.800000  loops per run = 645099
> total latency = 1.953125 ms
> cpu latency = 1.562500 ms
> max diff = 3.36909 ms (overrun 0)
> within 1ms = 35446, factor = 99.9295%
> within 2ms = 35471, factor = 100%
> deviation = 0.033815
> -----------------------------------------
> 
> The vanilla 2.6.5 has overruns here, bad against the others here.
> 
> 
> Happy Easter all,
> 
> Marcus
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-- 
Regards, Redeeman
redeeman@metanurb.dk

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