lkml.org 
[lkml]   [2001]   [Sep]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH] Significant performace improvements on reiserfs systems, kupdated bugfixes
On Sep 20, 2001  23:20 +0800, Beau Kuiper wrote:
> Patch 3 doesn't improve performace much (even in theory the number of
> dirty buffers being wrongly flushed is pretty low)

Actually, it _may_ even make performance worse (hard to say). Consider
the case where the "young" dirty buffers are in the same area of the
disk as the "old" dirty buffers. Once you are forced to write the "old"
buffers, you pretty much get to write the new buffers for free (low seek
overhead). They _could_ be merged in the elevator code.

Sadly, it is hard to tell whether this is possible or not, because the
code to do these things live in different places. Maybe we could have
an "optimistic" elevator merge, which only added "young" buffers if
they merged with other old buffers.

Cheers, Andreas
--
Andreas Dilger \ "If a man ate a pound of pasta and a pound of antipasto,
\ would they cancel out, leaving him still hungry?"
http://www-mddsp.enel.ucalgary.ca/People/adilger/ -- Dogbert

-
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: 2005-03-22 13:03    [W:0.066 / U:0.204 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site