Re: ~5x greater CPU load for a networked application when using 2.6.15-rt15-smp vs. 2.6.12-1.1390_FC4

[Gautam H Thaker <gthaker@atl.lmco.com>]

Matt Mackall 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/
>>
>>It has been documented before (and accepted) that this patch turns Linux into
>>a RT kernel but considerably slows down the code paths, esp. thru the I/O
>>subsystem. I want to provide some additional measurements and seek opinions
>>of if it might ever be possible to improve on this situation.
> 
> 
> Are you using the SLAB or SLOB allocator in the -rt kernel?

lake> grep SL config.2.6.15-rt15-smp
CONFIG_SEMAPHORE_SLEEPERS=y
CONFIG_SLAB=y
# CONFIG_SLOB is not set




-- 

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/