lkml.org 
[lkml]   [2003]   [Apr]   [16]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: DMA transfers in 2.5.67
From(Måns_Rullgård)
Date16 Apr 2003 12:13:09 +0200
Andrew Morton <akpm@digeo.com> writes:

> > # mount /ext3_fs
> > # time dd if=/ext3_fs/100MiB_file of=/dev/null bs=32k
> > 
> >   2.4.20aa1 : 3.3 sec (exactly what I expect to see)
> >   2.5.66    : 6.6 sec
> 
> With this test 2.4 will leave a lot more unwritten dirty data in memory.
> 
> You should include a `sync' in the timings.

That was reading a file discarding that data.  A sync shouldn't make
any difference.

-- 
Måns Rullgård
mru@users.sf.net
-
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 12:34    [from the cache]
©2003-2008