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List:       linux-kernel
Subject:    Re: ~5x greater CPU load for a networked application when using 2.6.15-rt15-smp
From:       Gautam H Thaker <gthaker () atl ! lmco ! com>
Date:       2006-02-28 22:19:04
Message-ID: 4404CC58.2020805 () atl ! lmco ! com
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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
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