Messages in this thread |  | | | Date | Thu, 30 Jun 2005 18:00:40 -0700 (PDT) | | From | William Weston <> | | Subject | Re: Real-Time Preemption, -RT-2.6.12-final-V0.7.50-24 |
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On Thu, 30 Jun 2005, William Weston wrote: > On Fri, 1 Jul 2005, Karsten Wiese wrote: > > --- linux-2.6.12-RT-50-35/arch/i386/kernel/mpparse.c 2005-06-30 16:38:00.000000000 +0200 > > +++ linux-2.6.12-RT/arch/i386/kernel/mpparse.c 2005-06-29 20:30:50.000000000 +0200 > > @@ -263,6 +263,7 @@ > > return; > > } > > mp_ioapics[nr_ioapics] = *m; > > + io_apic_base[nr_ioapics] = IO_APIC_BASE(nr_ioapics); > > nr_ioapics++; > > } > > > > @@ -914,6 +915,7 @@ > > mp_ioapics[idx].mpc_apicaddr = address; > > > > set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address); > > + io_apic_base[idx] = IO_APIC_BASE(idx); > > mp_ioapics[idx].mpc_apicid = io_apic_get_unique_id(idx, id); > > mp_ioapics[idx].mpc_apicver = io_apic_get_version(idx); > > Thanks, Karsten. This patch was needed to get my Xeon/HT (i865) to boot > -50-39. Next I'll see if IOAPIC_FAST will work. I'll keep you posted.
After applying this patch to -50-39, IOAPIC_FAST now works on both the Xeon/HT and the non-HT Xeon boxes (i865 and i845 respectively). Wakeup latencies are looking better, especially on the Xeon/HT (max of 53us so far, as compared to 183us with -50-37 without IOAPIC_FAST).
I'll test this out on the Athlon box (which hasn't done well with IOAPIC_FAST previously) when I get home.
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