On Sun, 19 Aug 2001, Greg Johnson wrote: > Now that I can finally boot my AS2100 with an SMP 2.4.x kernel (with > to the patch from Christopher C. Chimelis), I've found that SMP doesn't > work so well. When the first CPU boots, it registers 1082.96 BogoMIPS, > but when the second comes up it only gets 8.24 BogoMIPS. /proc/cpuinfo > reports two processors, but the machine feels like it only has one. > When I run two jobs on it both get 50% cpu (according to top). > > I have tried removing each processor to make sure they work individually > (they do). I also had this problem with 2.2.x but never really > investigated it. Perhaps it's a hardware/firmware problem?
That's extremely strange. FYI, the SMP patch is incorporated into 2.4.9 (along with several of my other patches). Looks like there may be a problem with the hardware (perhaps the second socket?), but it's hard to tell. If you boot a uniprocessor kernel, do you get the 1082.96 BogoMIPS on the CPU (try each)? > Does anyone have any suggestions how I can get both processors fully > working? I've attached "dmesg" output along with /proc/cpuinfo and my > kernel config. I defined DEBUG_SMP in linux/arch/alpha/kernel/smp.c, so > it's a little more verbose than usual. I'll see what I can make of this. C
