On Thu, Nov 01, 2007 at 09:10:02PM -0500, Florin Iucha wrote:
> On Fri, Nov 02, 2007 at 09:33:21AM +0800, Fengguang Wu wrote:
> > > I will try that with a USB disk - I hope that won't make a difference.
> >
> > Thank you. I guess a reiserfs on loop file would also be OK.
> >
> > > > btw, what's the exact kernel version you are running?
> > >
> > > I noticed it with the kernel in the $SUBJECT, as reported by 'git
> > > describe'. I have pulled in new changesets since then.
> >
> > And with the following patch applied?
> >
> > ---
> > fs/reiserfs/stree.c | 3 ---
> > 1 file changed, 3 deletions(-)
> >
> > --- linux-2.6.24-git17.orig/fs/reiserfs/stree.c
> > +++ linux-2.6.24-git17/fs/reiserfs/stree.c
> > @@ -1458,9 +1458,6 @@ static void unmap_buffers(struct page *p
> > }
> > bh = next;
> > } while (bh != head);
> > - if (PAGE_SIZE == bh->b_size) {
> > - cancel_dirty_page(page, PAGE_CACHE_SIZE);
> > - }
> > }
> > }
> > }
>
> ... and with the above patch applied.
>
> Copying 300 MB from root (ext3) to the new file system did not trigger
> the pdflush condition. But then I did a
> cd $MOUNTPOINT && find . -exec md5sum {} \;
> and that brought one cpu to 75% iowait.
Immediately? Do you have the debug printk messages this time(with the
above patch)?
> I have attached my .config, if it helps.
It's really curious - I tried your .config and commands, and still
could not trigger the high iowait. I'm running 64bit Intel Core 2,
and kernel 2.6.24-rc1-git6 with the above patch.
Fengguang
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