lkml.org 
[lkml]   [2006]   [Apr]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: CSCAN I/O scheduler for 2.6.10 kernel
Vishal Patil wrote:
> Maintain two queues which will be sorted in ascending order using Red
> Black Trees. When a disk request arrives and if the block number it
> refers to is greater than the block number of the current request
> being served add (merge) it to the first sorted queue or else add
> (merge) it to the second sorted queue. Keep on servicing the requests
> from the first request queue until it is empty after which switch over
> to the second queue and now reverse the roles of the two queues.
> Simple and Sweet. Many thanks for the awesome block I/O layer in the
> 2.6 kernel.
>
Why both queues sorting in ascending order? I would think that one
should be in descending order, which would reduce the seek distance
between the last i/o on one queue and the first on the next.

--
-bill davidsen (davidsen@tmr.com)
"The secret to procrastination is to put things off until the
last possible moment - but no longer" -me
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-04-04 22:27    [W:0.102 / U:0.152 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site