Messages in this thread | | | Date | Wed, 9 Jul 2008 16:52:17 +0200 | From | Luotao Fu <> | Subject | Re: 2.6.24-rc8-rt1: Strange latencies on mpc5200 powerpc - RCU issue? |
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Hi Wolfgang, On Wed, Jul 09, 2008 at 03:15:01PM +0200, Wolfgang Grandegger wrote: > Hi Fu (without n) > .... > OK, in the past you have been able to reproduce the high latencies with > 2.6.24-rt1 and CONFIG_RCU_TRACE disabled, IIRC. Did you use a different > toolchain at that time? >
Nope. As mentioned above, trace_mark() does some "real" works (what ever it is.), while the new mechahnismen use flags to remember the state of preemption. Maybe something here got optimized away? I take for grant, that you use gcc in your toolchain. Which version do you have?
cheers Fu -- Dipl.-Ing. Luotao Fu | Phone: +49-5121-206917-3 Pengutronix - Linux Solutions for Science and Industry Entwicklungszentrum Nord http://www.pengutronix.de
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