pomale ide disky?

[Petr Soucek]

Martin Och wrote:
> 
> Ja to mam nastavene -c1m16d1X66 

U novejsich boardu c1 neni potreba, protoze 32-bitovy prenos je default,
m16 podle mych zkusenosti nema zadny vliv, d1 je dulezite, jadra od
RedHatu default nezapinaji DMA, i kdyz ho chipset i disk umoznuje, lze
nastavit v konfiguraci kernelu, X66 je nutne jen v pripade, ze BIOS
nezna ATA/66 disky, a i v tom pripade to udela vic skody nez uzitku. 

Doporucuji postupne zapinat a vypinat jednotlive volby a zkouset, co to
udela. Pokud je to mozne, tak bych to ale delal na nenamountovanem
disku, jinak hrozi totiz poniceni filesystemu.

Ja mam pro starsi GA-686LX3 (PIIX4) s Celeronem 400 a diskem
IBM-DPTA-353750 nastaveno jen:

hdparm /dev/hdc

/dev/hdc:
 multcount    =  0 (off)
 I/O support  =  0 (default 16-bit)
 unmaskirq    =  0 (off)
 using_dma    =  1 (on)
 keepsettings =  1 (on)
 nowerr       =  0 (off)
 readonly     =  0 (off)
 readahead    =  8 (on)
 geometry     = 4560/255/63, sectors = 73261440, start = 0

presto hdparm (verze 3.6) ukazuje:

hdparm -tT /dev/hdc

/dev/hdc:
 Timing buffer-cache reads:   128 MB in  1.47 seconds =87.07 MB/sec
 Timing buffered disk reads:  64 MB in  3.28 seconds =19.51 MB/sec

Starsi IBM-DJNA-352500 jsou pomalejsi:
/dev/hdb:
 Timing buffer-cache reads:   128 MB in  1.48 seconds =86.49 MB/sec
 Timing buffered disk reads:  64 MB in  4.32 seconds =14.81 MB/sec


> ale u disku 27 GB, a slape:
> 
> hdparm -tT /dev/hdc
> 
> Timming buffer-cache reads 64MB in 0.89 seconds = 71.91 MB/ses
> Timming buffered disk reads 32MB in 1.83 seconds = 17.49 MB/ses
> 
> Mereno za provozu proxy, tak nevim jak je to objektivni...
> 
> to d1 znamena pouzivat DMA, a u Vas to nevidim...
> 

Zdravi

Petr Soucek