From: "Tim Sander" <tim.sander@hbm.com>
To: "RT" <linux-rt-users@vger.kernel.org>
Cc: "Steven Rostedt" <rostedt@goodmis.org>,
"LKML" <linux-kernel@vger.kernel.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Carsten Emde" <C.Emde@osadl.org>,
"John Kacur" <jkacur@redhat.com>
Subject: Re: [ANNOUNCE] 3.4.9-rt17
Date: Fri, 24 Aug 2012 10:32:14 +0200 [thread overview]
Message-ID: <1494830.WYyVmtosNh@dabox> (raw)
In-Reply-To: <1843545.6vtXSYEOLB@dabox>
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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next prev parent reply other threads:[~2012-08-24 8:32 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-16 19:22 [ANNOUNCE] 3.4.9-rt17 Steven Rostedt
2012-08-22 11:48 ` Tim Sander
2012-08-22 13:08 ` Tim Sander
2012-08-24 8:32 ` Tim Sander [this message]
2012-08-22 19:49 ` Problem between rt-patches and OMAP SPI driver Gregoire Gentil
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