Re: lug-bg: cpuinfo

[danchev@email.domain.hidden (George Danchev)]

On 29 03 2003 12:44, sheib wrote:
<em class="quotelev1">> predi godina na lkml imashe takyv thread as i recall.
<em class="quotelev1">> niakoi x86 cpu-ta imat problemi s l2 cache sizing.
<em class="quotelev1">> bootvai s 'cachesize=<actual size>' kato workaround.
<em class="quotelev1">>
<em class="quotelev1">> mojesh da razgledash i arch/i386/kernel/setup.c za da
<em class="quotelev1">> vidish che ne si edinstven s toia problem :)
<em class="quotelev1">> obshto vzeto pri detectvane na tipa cpu (reportvash
<em class="quotelev1">> incorrectly) mu se assignva opredeleno kolichestvo
<em class="quotelev1">> cache, koeto e mn.dyrveno, no drug nachin niama.

naistina interesno... vse pove4e se ubezhdam 4e old nice x86 cpu's sa naj 
buggy crap deto mozhe da se sreshne, cheap chips;-) neznam kak stoj vyprosa s 
transmeta's crusoe i tehniq code morphing oba4e de, stoto tam mozhe da 
korigirat dosta gyvkavo t.e. softuerno harduernite izdunki... ta osven 4e 
nqkoj x86 cpu models report-vat wrong cachesize ima i takiva kojto vyobste ne 
reportvat nikyf size nemat takyf feature implementedv chip-a, za da stane 
oste po-gadno gi pravqt i v nqkolko varianta s razli4en cachesize kojto ne 
moze da se razpoznae stoto chip-a e lame, a pyk ne e safe da se setne tvyrdo 
kato po-golemiq size value, e.g. tova maj e case-a s PIII Tualatin s 256 i 
512 cache variants i se nalaga boottime overwrite za po-golemiq cachesize, 
stoto ako se setne 512, pyk boot-ne na cpu s 256 ste stane kofti harduerna 
izmama za kernel-a;-) 

Az imam edin drug vypros malko v strani: Kak se detect-va (ili se znae 
predvaritelno za vseki cpu type) kolko rings na privileges za code execution 
ima cpu-to i kak Linux kernel-a upravlqva cpu-to da execute-va (izteglq ot 
pametta i execute-va s opredelqni privileges) code na edin ili drug ring. 
(kyde se gleda tova v source-a na kernel-a, qvno ste e nqkyde iz asm's ama 
vinagi kogato sym se opitval da go razbera maj go podminavam ;-). 4uval sym 
4e za x86 cpu's obiknoveno za 4 rings ot kojto kernel-a polzva 2 , e.g. 0 - 
kernel code i 3 - user code ? Solaris i OS/2 maj polzvat i 4-te ring-a na 
code execution privileges na x86 ili ne vinagi e taka ? 

10x. (just interesting)

-- 
pub  4096R/0E4BD0AB 2003-03-18 (no comments) <danchev_at_spnet.net> 
1AE7 7C66 0A26 5BFF DF22 5D55 1C57 0C89 0E4B D0AB <keyserver.bu.edu>
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