lkml.org 
[lkml]   [2004]   [Oct]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Page cache write performance issue
On Wed, Oct 13, 2004 at 08:20:41PM -0700, Andrew Morton wrote:
> Nathan Scott <nathans@sgi.com> wrote:
> > I just tried switching CONFIG_HIGHMEM off, and so running the
> > machine with 512MB; then adjusted the test to write 256M into
> > the page cache, again in 1K sequential chunks. A similar mis-
> > behaviour happens, though the numbers are slightly better (up
> > from ~4 to ~6.5MB/sec). Both ext2 and xfs see this. When I
> > drop the file size down to 128M with this kernel, I see good
> > results again (as we'd expect).
>
> No such problem here, with
>
> dd if=/dev/zero of=x bs=1k count=128k
>
> on a 256MB machine. xfs and ext2.

Yup, rebooted with mem=128M and on my box, & that crawls.
Maybe its just this old hunk 'o junk, I suppose; odd that
2.6.8 was OK with this though.

> Can you exhibit this one more than one machine?

I haven't got a second ia32 box atm - setting one up soon,
will let you know how it goes.

> Silly question: what does `grep sync' /etc/fstab say over there? ;)

Same thing it said on 2.6.8. :) Nada.

cheers.

--
Nathan
-
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 14:07    [W:0.034 / U:1.656 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site