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
Attachment:
signature.asc
Description: Digital signature
