Messages in this thread | | | Date | Fri, 24 Feb 2006 14:25:50 -0500 | From | Gautam H Thaker <> | Subject | Re: ~5x greater CPU load for a networked application when using 2.6.15-rt15-smp vs. 2.6.12-1.1390_FC4 |
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Theodore Ts'o wrote: > On Thu, Feb 23, 2006 at 02:55:56PM -0500, Gautam H Thaker wrote: > >>The real-time patches at the URL below do a great job of endowing Linux with >>real-time capabilities. >> >>http://people.redhat.com/mingo/realtime-preempt/ > > > Gautam, > > #1) Can you publish the code you used in your tests?
This may not be easy for me but I will try to get corp. approval(s). Basically, the process that is, at least according to "top", showing ~5x increased CPU usage is receiving very short UDP packets over a gigabit interface at the rate of about 38,000 per second. UDP packets are small and according to "/sbin/ifconfig" there are no errors, drops, overruns, frame or carrier errors or collisions. (it is an isolated network of 20 PC3000s (3 GH Xeon processors) at www.emulab.net.
> > #2) Can you post your .config file? In particular, did you have any > of the latency measurement options or other debugging options?
The config file I had used to build the "RT" kernel can be found at:
http://www.atl.external.lmco.com/projects/QoS/config.2.6.15-rt15-smp
I had tried to have all debug options off
> > Regards, > > - Ted
Gautam
--
Gautam H. Thaker Distributed Processing Lab; Lockheed Martin Adv. Tech. Labs 3 Executive Campus; Cherry Hill, NJ 08002 856-792-9754, fax 856-792-9925 email: gthaker@atl.lmco.com - 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/
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