lkml.org 
[lkml]   [2007]   [Jun]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: Question about fair schedulers
Date
On Saturday 23 June 2007, Kyle Moffett wrote:
> On Jun 22, 2007, at 18:07:15, Alberto Gonzalez wrote:
> > P.S: As a second thought, a fair scheduler could behave really good
> > in other scenarios, like a server running a busy forum on apache
> > +mysql+php. Besides, this is a more real world scenario (and easier
> > to benchmark). Why aren't people testing these schedulers under
> > this kind of load?
>
> That kind of load is boring precisely because it doesn't care about
> interactivity. CFS/SD aren't a whole lot different from mainline-
> without-interactivity in that respect, precisely because the latency
> of the network is between ten and a hundred times more than the
> latency of the scheduler. The only time it really matters is with
> desktops where users care about smoothness.

Well, I've just seen some benchmarks of this kind with CFS and it does make a
difference. The scalability problem with MySQL seems to get solved with this
scheduler. However, the peak throughput is quite lower than with the same
kernel/glibc version and mainline scheduler.

http://jeffr-tech.livejournal.com/

Anyway, this kind of testing seems to be useful. Linux is too widely deployed
in servers to ignore the behavior of a CPU scheduler in that scenario.

Cheers,
Alberto.
-
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: 2007-06-27 14:41    [W:0.106 / U:0.132 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site