>Gilles Chanteperdrix <gilles.chanteperd...@xenomai.org> wrote on 08/26/2011 02:18:05 PM: > On 08/26/2011 10:42 PM, George Broz wrote: > > Hello, > > > > I'm experiencing very large overruns in the neighborhood of 10 to 50 > > *milli-seconds* as reported by the Xenomai latency tool in user-task mode > > whenever the Linux OS is heavily loaded. Under lighter loads these are in > > the 30 to 70 micro-second (normal) range. > > > > My system is: > > - Linux 2.6.37.6 (32-bit), Ubuntu 10.10 distribution > > - Xenomai 2.5.6 using I-pipe patch adeos-ipipe-2.6.37.6-x86-2.9-02 > > - Intel x86 Atom (dual-core) CPU D510 @ 1.66GHz > > - Emb. dev board from Intel (ICH8M ctrlr, Ethernet h/w for e1000e) > > - Xenomai configured w&w/o --enable-smp --enable-x86-tsc options > > - gcc version 4.4.5 > > > > I've followed all of the recommendations for kernel configuration and have > > disabled CPU sleep features in the BIOS such as SpeedStep and C-States. > > Legacy USB has been disabled in the BIOS. Hyperthreading has also been
> > disabled, although I don't think it matters. > > Have you tried to enable the SMI workaround? > > -- > Gilles. > Yes - SMI workaround was enabled when the overruns were observed. # CONFIG_XENO_HW_SMI_DETECT_DISABLE is not set CONFIG_XENO_HW_SMI_DETECT=y CONFIG_XENO_HW_SMI_WORKAROUND=y CONFIG_XENO_HW_SMI_ALL=y Aug 25 11:32:33 nxtgenhd kernel: [ 2.492709] I-pipe: Domain Xenomai registered. : Aug 25 11:32:33 nxtgenhd kernel: [ 11.579015] Xenomai: SMI-enabled chipset found Aug 25 11:32:33 nxtgenhd kernel: [ 11.579044] Xenomai: SMI workaround enabled --George _______________________________________________ Xenomai-help mailing list Xenomai-help@gna.org https://mail.gna.org/listinfo/xenomai-help
