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SubjectRe: [PATCH] Radix-tree pagecache for 2.5
From

Benchmark results on 2.4.17 and 2.4.17 with radix-tree
(ratpagecache) patch. Identical results removed.

dbench 192 was the same. dbench 64 is virtually equal,
considering dbench normal flucutation.

dbench 64 processes
2.4.17 ************************* 12.5 MB/sec
2.4.17rat ************************ 12.1 MB/sec

Unixbench-4.1.0
2.4.17 2.4.17rat
Pipe Throughput 387881.3 379702.9
Pipe-based Context Switching 105911.3 91653.3
Process Creation 1180.3 1197.4
System Call Overhead 304463.9 335158.8
Shell Scripts (1 concurrent) 617.4 615.6
C Compiler Throughput 225.7 227.7
Dc: sqrt(2) to 99 decimal places 13988.7 14360.6


LMbench 2.0p2

Processor, Processes - times in microseconds - smaller is better
----------------------------------------------------------------
OS null open selct sig sig fork exec sh
call stat clos TCP inst hndl proc proc proc
--------------- ---- ---- ---- ----- ---- ---- ----- ----- -----
Linux 2.4.17 0.43 3.41 6.16 36.8 1.43 3.26 932 3717 13612
Linux 2.4.17rat 0.43 4.56 7.80 55.4 1.45 3.17 901 3580 13239

Context switching - times in microseconds - smaller is better
-------------------------------------------------------------
OS 2p/0K 2p/16K 2p/64K 8p/16K 8p/64K 16p/16K 16p/64K
ctxsw ctxsw ctxsw ctxsw ctxsw ctxsw ctxsw
---------------- ----- ------ ------ ------ ------ ------ ------
Linux 2.4.17 1.20 24.07 188.7 56.5 209.0 59.2 223.3
Linux 2.4.17rat 1.21 22.93 187.9 58.0 208.8 61.8 226.4

*Local* Communication latencies in microseconds - smaller is better
-------------------------------------------------------------------
OS 2p/0K Pipe AF TCP TCP
ctxsw UNIX conn
--------------- ----- ----- ----- ----- -----
Linux 2.4.17 2.04 10.17 21.21 65.82 288.2
Linux 2.4.17rat 2.04 10.09 20.46 60.76 289.4

File & VM system latencies in microseconds - smaller is better
--------------------------------------------------------------
OS 0K File 10K File Mmap Prot Page
Create Delete Create Delete Latency Fault Fault
--------------- ------ ------ ------ ------ ------- ----- -----
Linux 2.4.17 123.9 165.6 677.1 242.8 2602 1.076 8.0
Linux 2.4.17rat 128.9 169.7 618.8 256.2 2762 1.051 7.7
*Local* Communication bandwidths in MB/s - bigger is better
-----------------------------------------------------------
OS Pipe AF TCP File Mmap Bcopy Bcopy Mem Mem
UNIX reread reread (libc) (hand) read write
--------------- ----- ----- ----- ------ ------ ------ ------ ----- -----
Linux 2.4.17 61.5 49.2 60.5 61.7 237.4 59.2 60.3 237.3 85.0
Linux 2.4.17rat 64.4 42.8 60.3 61.4 237.5 59.1 60.2 237.4 84.7

Memory latencies in nanoseconds - smaller is better
---------------------------------------------------
OS Mhz L1 $ L2 $ Main mem
----------------- ---- ----- ------ --------
Linux 2.4.17 501 4.2 188.1 262.2
Linux 2.4.17rat 501 4.2 195.4 262.0

Threaded I/O Bench
Read, Write, and Seeks are MB/sec
CPU Effiency (CPU Eff) = (MB/sec) / CPU% (bigger is better)

Num Seq Read CPU Rand Read CPU
Thr Rate (CPU%) Eff Rate (CPU%) Eff
--- ------------------- -----------------
2.4.17 1 13.23 43.2% 30.62 2.74 3.7% 73.88
2.4.17rat 1 12.60 43.0% 29.30 2.75 3.8% 72.45
2.4.17 2 11.56 29.9% 38.66 3.04 3.8% 79.89
2.4.17rat 2 11.07 30.4% 36.41 3.06 4.3% 71.81

2.4.17 4 11.03 25.9% 42.59 3.19 4.1% 78.26
2.4.17rat 4 10.62 26.5% 40.08 3.15 4.2% 74.32

2.4.17 8 10.62 22.8% 46.58 3.29 4.2% 77.99
2.4.17rat 8 10.23 23.4% 43.72 3.26 4.5% 73.05

Num Seq Write CPU Rand Write CPU
Thr Rate (CPU%) Eff Rate (CPU%) Eff
--- ------------------- -----------------
2.4.17 1 11.08 50.5% 21.94 0.69 1.6% 44.10
2.4.17rat 1 7.77 32.8% 23.69 0.53 1.1% 48.44
2.4.17 2 10.83 48.6% 22.28 0.69 1.5% 45.13
2.4.17rat 2 7.51 32.1% 23.38 0.52 1.1% 45.98

2.4.17 4 10.40 45.9% 22.66 0.68 1.5% 44.70
2.4.17rat 4 7.62 32.8% 23.25 0.53 1.2% 45.21

2.4.17 8 10.17 44.8% 22.70 0.67 1.5% 44.73
2.4.17rat 8 7.55 32.5% 23.24 0.53 1.2% 44.66


bonnie++
Version 1.02a ---------------------Sequential Output--------------------
-----Per Char----- ------Block------- -----Rewrite------
Kernel Size MB/sec %CPU Eff MB/sec %CPU Eff MB/sec %CPU Eff
2.4.17 1024 3.41 98.0 3.48 14.56 65.6 22.19 8.83 51.0 17.32
2.4.17rat 1024 3.36 98.0 3.43 10.64 41.6 25.57 6.79 37.2 18.27
Version 1.02a -----------Sequential Input----------- ------Random-----
-----Per Char----- ------Block------- ------Seeks------
Kernel Size MB/sec %CPU Eff MB/sec %CPU Eff /sec %CPU Eff
2.4.17 1024 3.98 97.2 4.10 16.39 60.6 27.05 132 2.0 6609
2.4.17rat 1024 3.92 96.0 4.08 15.46 57.0 27.12 126 2.0 6302
-------Sequential Create-----------
------Create----- -----Delete-----
files /sec %CPU Eff /sec %CPU Eff
2.4.17 16384 4421 96.8 4567 4719 97.4 4845
2.4.17rat 16384 3973 97.6 4070 4531 95.0 4769
-------Random Create----------------
------Create----- -----Delete-----
files /sec %CPU Eff /sec %CPU Eff
2.4.17 16384 4475 98.0 4566 4124 94.0 4387
2.4.17rat 16384 4203 98.0 4288 4005 94.4 4242

Build times. Smaller is better - task completed faster.

perl_build kernel_build
2.4.17 1620 1347
2.4.17rat 1629 1444

radix-tree saves 768k on 384M machine.

2.4.17rat Memory: 385932k/393216k available (885k kernel code, 6900k reserved
2.4.17 Memory: 385164k/393216k available (884k kernel code, 7668k reserved

Results like these on more kernels at:
http://home.earthlink.net/~rwhron/kernel/k6-2-475.html

--
Randy Hron

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