lkml.org 
[lkml]   [2007]   [Aug]   [6]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
DateMon, 6 Aug 2007 08:58:34 +0200
FromIngo Molnar <>
SubjectRe: [PATCH 00/23] per device dirty throttling -v8
* Diego Calleja <diegocg@gmail.com> wrote:

> > Measurements show that noatime helps 20-30% on regular desktop 
> > workloads, easily 50% for kernel builds and much more than that (in 
> > excess of 100%) for file-read-intense workloads. We cannot just walk
> 
> And as everybody knows in servers is a popular practice to disable it. 
> According to an interview to the kernel.org admins....

yeah - but i'd be surprised if more than 1% of all Linux servers out 
there had noatime.

> "Beyond that, Peter noted, "very little fancy is going on, and that is 
> good because fancy is hard to maintain." He explained that the only 
> fancy thing being done is that all filesystems are mounted noatime 
> meaning that the system doesn't have to make writes to the filesystem 
> for files which are simply being read, "that cut the load average in 
> half."

nice quote :-)

> I bet that some people would consider such performance hit a bug...

yeah.

	Ingo
-
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: 2007-08-06 07:01    [from the cache]
©2003-2008