lkml.org 
[lkml]   [1999]   [Mar]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: disk head scheduling

On Thu, 18 Mar 1999, Arvind Sankar wrote:

> > > Another point is that IN_ORDER seems to be called only for two requests
> > > on the same device, so no idea why it compares the device numbers.
> >
> > no, all requests (for all devices) are in a single 'queue'. (Per-major
> > device queues is candidate 2.3 feature, it's really simple)
>
> oh. I realized that it was at least per-major, but it's global, huh?

the sorting (the elevator algorithm) is per-device. The queue is
technically one queue, but thats just an implementation matter. (and of
course it matters in the case when we hit the queue length limit)

-- mingo


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:50    [W:2.048 / U:0.004 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site