Messages in this thread | | | Date | Fri, 09 Apr 2004 23:47:17 +0200 | From | Marcus Hartig <> | Subject | 2.6.5 latencytest +aa5 +mm3 as/cfq scheduler |
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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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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