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SubjectRe: Painlessly shrinking kernel messages (Re: kernel support for non-english user messages)
This time, my text compression program ignores word boundaries.  Below 
are the results.

"shrink" is the size reduction due to replacing the given string with a
one-byte code. (accounts for space required for codes and the decode
string plus nul).
"count" is how many times the string appears.
Strings are delimited by [brackets].

At the end, the "original size" accounts for null termination for all
strings.
The "new size" is the size of the text with the codes inserted plus the
amount of space required to store what the codes map to.

Nothing accounts for the space wasted due to the strings being 32-bit
aligned or whatever various architectures might require. This is just
an estimate.

What the heck is "[^_]" ? Is it a machine instruction that 'strings' is
mistaking for a string? I grep'd through the kernel source and didn't
find it.


The results are that the kernel messages are reduced from 232690 to
154365, which is a savings of 33%. Not bad, but it's probably still not
worth it yet; the pain is still greater than the benefit.


Here's the list.

shrink count word
------ ----- ------------------------------
3166 1057 [[^_]]
2888 290 [ CONTROLLER]
1963 656 [UWVS]
1771 198 [ TECHNOLOG]
1758 881 [ IN]
1678 561 [TION]
1438 721 [ CO]
1268 255 [SYSTEM]
1126 189 [ BRIDGE]
1116 560 [PCI]
994 167 [JOURNAL]
986 53 [F 56K DATA/FAX/VOICE]
964 323 [ ]
932 468 [TER]
870 110 [ ETHERNET]
824 414 [ING]
772 388 [DEV]
745 84 [ELECTRONIC]
742 249 [MODE]
738 371 [POR]
706 355 [ED ]
706 60 [KERNEL: ASSER]
643 216 [LOCK]
592 298 [PRO]
586 295 [ENT]
554 279 [S: ]
516 260 [REA]
510 257 [IDE]
496 167 [ABLE]
478 81 [TRANSAC]
474 239 [AGE]
474 239 [NET]
466 235 [ON ]
464 234 [EXT]
458 116 [CACHE]
424 214 [<3>]
418 106 [REGIS]
416 210 [RES]
415 140 [ LTD]
415 140 [FAIL]
414 209 [ %D]
409 138 [DATA]
394 199 [COM]
394 133 [NOT ]
390 197 [ARD]
388 196 [E_R]
386 98 [ ADAP]
378 191 [FOR]
374 95 [MICRO]
373 16 [ ROAD RUNNER FRAME GRABBER]
370 187 [SET]
354 179 [VER]
350 177 [ELE]
348 176 [ALL]
326 165 [100]
318 161 [AND]
312 158 [_IN]
307 104 [TIME]
306 155 [<6>]
303 62 [AIC-78]
298 26 [SEMICONDUCTOR]
294 149 [SER]
288 146 [AL ]
288 59 [MEMORY]
283 96 [%02X]
282 143 [LIN]
280 142 [ATE]
273 56 [BUFFER]
272 138 [TCP]
270 137 [ %S]
262 67 [AUDIO]
258 66 [82801]
256 130 [ECT]
254 65 [ HOST]
254 129 [PER]
253 16 [08X %08X %08X %08X]
250 127 [TO ]
248 126 [OUN]
248 126 [PHT]
246 63 [C(%D)]
246 32 [SMARTDAA)]
244 42 [CANNOT ]
244 124 [ORT]
238 121 [9D$]
238 121 [CHI]
238 49 [F 56K ]
238 21 [FIBRE CHANNEL]
236 120 [T_R]
234 119 [BIT]
233 48 [MODULE]
232 118 [CON]
232 118 [NIC]
230 117 [%LU]
230 59 [POWER]
230 117 [REE]
226 58 [ERROR]
215 32 [%U.%U.%U]
215 32 [GRAPHICS]
214 109 [EST]
214 73 [NULL]
214 73 [SOCK]
212 108 [ALI]
212 108 [TRI]
210 54 [WRITE]
208 106 [%08]
202 103 [BUS]
202 69 [GDT ]
202 52 [GROUP]
200 102 [<4>]
200 102 [D$ ]
200 102 [OUT]
196 67 [FILE]
196 67 [GET_]
193 16 [ MIL-STD-1553 ]
190 25 [ [APOLLO ]
184 94 [ESS]
182 47 [CHECK]
182 93 [D$$]
176 90 [STA]
174 89 [AGP]
174 45 [CYBER]
173 8 [ABCDEFGHIJKLMNOPQRSTUVWXYZ]
169 58 [TECH]
168 86 [ RE]
166 85 [82C]
160 82 [000]
160 82 [ACC]
160 82 [END]
original size=232690, new size=154365

You may notice a goof my program makes. The string "%U.%U.%U" appears
in there, when what is actually found in the kernel is "%U.%U.%U.%U".
That's because there are more of the former, but only because the
program didn't realize that pairs of the former overlap with each other.
I'll see about fixing that later, but really, I think we'll need to
hand-pick strings anyhow.

Lastly, I decided to allow two-character strings to be encoded and upped
the number of codes to 184. This is the result:
original size=232690, new size=109133
That's a reduction of 53%.


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