SCSI kontra EIDE

[Ales Pour]

On 12 Nov 1997, Snek wrote:

> Je opravdu to SCSI tak rychle? Neni to tak jako
> s EIDE kde hdparm -ftT /dev/hda nameri na disku
> 
> Snek.

No ja ziju s presvedcenim, ze scsi se projevi kdyz se systemu
nalozi trochu vic na zada... Drive, kdyz (e)ide radice
nedelaly busmastering, tak to vsechno odnes procesor.
Nevim jak dobry sou ty novejsi...
Treba tohle o swapovani napsal pred trochu delsi dobou Alan Cox,
co driv spravoval scsi pro linux:
      
 From:                
Alan Cox <alan na cymru.net>
 Subject:            
Re: SCSI vs IDE swapping

 A good scsi controller (like the 2842) has swapping properties looking
 like this
      CPU: humm need to swap
      CPU: queue this page, this page this page... controller - go do it
      DISK: OK

 IDE is
      CPU: humm need to swap
      CPU: this page
      DISK: data ?
      CPU: copy copy copy copy copy copy
 
So while IDE may be very fast all the time one process is swapping out isnt
 available to others (which is very bad as busy processes swap idle ones out)
 Note that the triton IDE is far far better.
   Alan
   

Ales Pour