Vyuziti CPU a HDD

[Milan Keršláger]

On Wed, May 26, 2004 at 01:23:35PM +0200, Phill wrote:
> > > cp funguje podobne, 600MB soubor to kopirovalo 5,7MB/s.
> > 
> > To je nejak malo, ne?
>
> router-phill:/mnt/hdc# hdparm -tT /dev/hdc
> 
> /dev/hdc:
>  Timing buffer-cache reads:   128 MB in  3.13 seconds = 40.89 MB/sec
>  Timing buffered disk reads:  64 MB in  4.76 seconds = 13.45 MB/sec

To je malo. Podivejte se, zda mate 32 bitovy pristup a DMA:

# hdparm /dev/hda

/dev/hda:
 multcount    = 16 (on)
 IO_support   =  1 (32-bit)
 unmaskirq    =  1 (on)
 using_dma    =  1 (on)
 keepsettings =  0 (off)
 readonly     =  0 (off)
 readahead    =  8 (on)
 geometry     = 9729/255/63, sectors = 156301488, start = 0

Take se podivejte, v jakem rezimu jede ATA rozhrani (alespon 66MB/s):

# cat /proc/ide/via

V pripade FTP demona nebo WWW serveru se presvecte, ze pouzivate program
s pouzitym volanim sendfile(). To zvysi propustnost a snizi zatez.

-- 
                        Milan Kerslager
                        E-mail: milan.kerslager na pslib.cz
                        WWW:    http://www.pslib.cz/~kerslage/