linux-kernel - Re: [ANNOUNCE] 3.4.9-rt17

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Date:	Fri, 24 Aug 2012 10:32:14 +0200
From:	"Tim Sander" <tim.sander@....com>
To:	"RT" <linux-rt-users@...r.kernel.org>
Cc:	"Steven Rostedt" <rostedt@...dmis.org>,
	"LKML" <linux-kernel@...r.kernel.org>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Carsten Emde" <C.Emde@...dl.org>, "John Kacur" <jkacur@...hat.com>
Subject: Re: [ANNOUNCE] 3.4.9-rt17

Hi 

After fixing the realtime prios which got shuffled due to other irq thread names
I just tested the realtime latency for interrupts on the i.mx35. With our own 
systemtimer which does not get into the way of  the measurement interrupt this 
kernel has 30µs worst time (caveat: short measurement period) interrupt 
latency and usermode can keep up with a 2400kHz interrupt rate. While the 
usermode performance seems to be largely unchanged (but i haven't tested very 
thoroughly) the interrupt latency went down about 10µs coming from the 3.0-rt 
series. Its really nice to see that kind of improvement. 

Thanks
Tim

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