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SubjectRe: [reiserfs-list] big reiserfs regression in 2.4.20-pre2
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Oleg Drokin <green @ namesys . com> wrote:
> Is regression going away if you pass this mount option to reiserfs:
> -o alloc=preallocmin=4:preallocsize=9

Yes.

On a quad xeon with 3.75 gb ram there is a regression on reiserfs
in dbench and tiobench with many threads between 2.4.20-pre1 and 2.4.20-pre2.
With alloc=preallocmin=4:preallocsize=9 mount option, throughput in pre2
is improved over pre1.

16% improvement instead of 23% regression at 192 processes

dbench reiserfs 192 processes Average High Low
2.4.20-pre1 55.94 58.17 54.26
2.4.20-pre2 42.98 44.73 42.30
2.4.20-pre2-oleg 64.95 66.72 63.36


9% improvement instead of 13% regression at 64 processes.

dbench reiserfs 64 processes Average High Low
2.4.20-pre1 70.98 72.53 69.47
2.4.20-pre2 61.93 64.01 57.31
2.4.20-pre2-oleg 77.32 80.89 74.95

tiobench-0.3.3
Unit information
================
File size = 12288 megabytes
Blk Size = 4096 bytes
Rate = megabytes per second
CPU% = percentage of CPU used during the test
Latency = milliseconds
Lat% = percent of requests that took longer than X seconds
CPU Eff = Rate divided by CPU% - throughput per cpu load

tiobench has a 5-8% improvement instead of ~70% regression on seq read
throughput. Latency numbers are affected too.

Sequential Reads reiserfs
Num Avg Maximum Lat% Lat% CPU
Kernel Thr Rate (CPU%) Latency Latency >2s >10s Eff
------------------ --- ----------------------------------------------------------
2.4.20-pre1 1 35.11 23.02% 0.331 107.07 0.00000 0.00000 152
2.4.20-pre2 1 34.68 22.83% 0.335 119.57 0.00000 0.00000 152
2.4.20-pre2-oleg 1 34.33 22.14% 0.339 105.78 0.00000 0.00000 155

2.4.20-pre1 32 27.27 20.12% 11.536 258436.68 0.01275 0.01135 136
2.4.20-pre2 32 8.00 6.05% 43.881 7568.44 0.00096 0.00000 132
2.4.20-pre2-oleg 32 28.72 21.72% 11.138 343417.50 0.00893 0.00801 132

2.4.20-pre1 64 26.50 19.63% 21.328 361756.08 0.02183 0.02053 135
2.4.20-pre2 64 8.42 6.46% 79.039 15721.84 0.18813 0.00000 130
2.4.20-pre2-oleg 64 29.98 22.19% 18.659 467771.18 0.01456 0.01335 135

2.4.20-pre1 128 27.72 21.17% 35.485 814716.92 0.02671 0.02549 131
2.4.20-pre2 128 9.30 7.10% 135.056 32520.09 3.92532 0.00035 131
2.4.20-pre2-oleg 128 27.71 21.14% 35.468 828979.66 0.02130 0.02066 131

2.4.20-pre1 256 26.55 19.95% 68.425 825224.03 0.04636 0.04515 133
2.4.20-pre2 256 8.47 6.49% 285.430 62013.50 4.68931 0.11676 131
2.4.20-pre2-oleg 256 28.64 22.36% 61.458 950604.45 0.03516 0.03408 128

Random Reads on reiserfs also improved instead of regressed with mount option.

Num Avg Maximum Lat% Lat% CPU
Kernel Thr Rate (CPU%) Latency Latency >2s >10s Eff
------------------ --- ----------------------------------------------------------
2.4.20-pre1 1 0.68 0.84% 17.320 51.54 0.00000 0.00000 81
2.4.20-pre2 1 0.70 0.76% 16.787 53.99 0.00000 0.00000 92
2.4.20-pre2-oleg 1 0.70 0.98% 16.619 43.82 0.00000 0.00000 72

2.4.20-pre1 32 3.09 6.80% 102.783 535.46 0.00000 0.00000 46
2.4.20-pre2 32 1.98 3.84% 147.780 16015.44 0.55000 0.00000 52
2.4.20-pre2-oleg 32 3.39 5.63% 92.170 502.70 0.00000 0.00000 60

2.4.20-pre1 64 3.10 5.99% 178.641 10722.38 0.50403 0.00000 52
2.4.20-pre2 64 2.18 3.70% 229.511 16850.53 2.77218 0.00000 59
2.4.20-pre2-oleg 64 3.48 7.41% 168.446 10493.64 0.22682 0.00000 47

2.4.20-pre1 128 3.35 5.27% 226.876 9018.16 1.91532 0.00000 64
2.4.20-pre2 128 2.31 3.98% 378.511 17932.69 5.77117 0.00000 58
2.4.20-pre2-oleg 128 3.39 5.54% 250.196 10655.95 3.09980 0.00000 61

2.4.20-pre1 256 3.26 6.44% 249.264 5751.33 0.57292 0.00000 51
2.4.20-pre2 256 2.20 5.53% 724.340 19268.40 13.09896 0.00000 40
2.4.20-pre2-oleg 256 3.60 7.93% 230.657 6055.77 0.10417 0.00000 45

Sequential Writes reiserfs
Num Avg Maximum Lat% Lat% CPU
Kernel Thr Rate (CPU%) Latency Latency >2s >10s Eff
------------------ --- ----------------------------------------------------------
2.4.20-pre1 1 39.31 71.71% 0.282 6301.59 0.00012 0.00000 55
2.4.20-pre2 1 38.28 73.39% 0.290 8058.03 0.00019 0.00000 52
2.4.20-pre2-oleg 1 38.01 70.29% 0.293 6619.27 0.00009 0.00000 54

2.4.20-pre1 32 29.64 119.5% 11.171 16619.06 0.18094 0.00000 25
2.4.20-pre2 32 23.52 103.0% 10.242 17721.55 0.13629 0.00000 23
2.4.20-pre2-oleg 32 29.49 117.0% 11.299 17672.19 0.17456 0.00000 25

2.4.20-pre1 64 29.02 115.6% 22.065 38792.62 0.38675 0.00426 25
2.4.20-pre2 64 20.92 84.06% 19.449 41273.31 0.33824 0.00480 25
2.4.20-pre2-oleg 64 30.07 108.3% 21.271 46079.52 0.35420 0.01504 28

2.4.20-pre1 128 31.52 111.6% 36.264 104743.20 0.40728 0.11428 28
2.4.20-pre2 128 22.31 87.18% 36.251 78916.66 0.46791 0.10154 26
2.4.20-pre2-oleg 128 30.70 109.9% 38.972 110734.31 0.46263 0.11740 28

2.4.20-pre1 256 28.95 132.7% 75.959 163159.61 0.79301 0.24067 22
2.4.20-pre2 256 20.08 93.50% 74.113 114883.50 0.83399 0.23864 21
2.4.20-pre2-oleg 256 29.69 125.8% 75.775 177649.14 0.73569 0.24844 24

Random Writes reiserfs
Num Avg Maximum Lat% Lat% CPU
Kernel Thr Rate (CPU%) Latency Latency >2s >10s Eff
------------------ --- ----------------------------------------------------------
2.4.20-pre1 1 3.57 3.80% 0.091 0.57 0.00000 0.00000 94
2.4.20-pre2 1 3.63 3.79% 0.089 0.68 0.00000 0.00000 96
2.4.20-pre2-oleg 1 3.62 3.78% 0.091 0.73 0.00000 0.00000 96

2.4.20-pre1 32 3.52 9.15% 0.654 268.43 0.00000 0.00000 38
2.4.20-pre2 32 3.57 8.15% 0.377 258.42 0.00000 0.00000 44
2.4.20-pre2-oleg 32 3.66 9.44% 0.268 73.53 0.00000 0.00000 39

2.4.20-pre1 64 3.68 9.50% 0.567 196.77 0.00000 0.00000 39
2.4.20-pre2 64 3.78 9.76% 0.450 319.24 0.00000 0.00000 39
2.4.20-pre2-oleg 64 3.85 9.36% 0.446 258.01 0.00000 0.00000 41

2.4.20-pre1 128 3.48 8.38% 2.923 626.60 0.00000 0.00000 42
2.4.20-pre2 128 3.54 8.98% 0.669 735.87 0.00000 0.00000 39
2.4.20-pre2-oleg 128 3.48 9.20% 0.794 742.98 0.00000 0.00000 38

2.4.20-pre1 256 3.45 9.11% 3.416 572.87 0.00000 0.00000 38
2.4.20-pre2 256 3.59 10.12% 1.350 824.15 0.00000 0.00000 35
2.4.20-pre2-oleg 256 3.58 9.06% 1.938 841.72 0.00000 0.00000 39


More details at:
http://home.earthlink.net/~rwhron/kernel/bigbox.html
--
Randy Hron

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