Re: -CURRENT kernel panic

On Sat, 6 Mar 2004, Vincent Poy wrote:

> On Fri, 5 Mar 2004, Jon Noack wrote:
>
> > On 3/5/2004 6:23 AM, Vincent Poy wrote:
> > > On Fri, 5 Mar 2004, Jon Noack wrote:
> > >> On 3/4/2004 4:13 PM, Vincent Poy wrote:
> > >>> On Thu, 4 Mar 2004, Andrew Gallatin wrote:
> > >>>> Vincent Poy writes:
> > >>>>> 	Interesting.  I'm still wondering what the VM_KMEM_SIZE_SCALE
> > >>>>> number represents.
> > >>>>
> > >>>> It tries to autoscale the kmem size, so that you don't need to hard
> > >>>> code it.  Hardcoding it could be bad if you change the amount of ram
> > >>>> in the box.
> > >>>
> > >>> 	That part I understand but what exactly does the number 2 and 3
> > >>> mean?
> > >>
> > >> VM_KMEM_SIZE_SCALE:
> > >> How many physical pages per KVA page allocated.
> > >>
> > >> <snip>
> > >
> > > 	I actually read that part already but is 2 basically 1/2 and 3
> > > actually just 1/3?
> >
> > That's the way I read it -- check out this comment again (from
> > src/sys/i386/include/vmparam.h -- hopefully the formatting will be ok):
> >  > /*
> >  >  * How many physical pages per KVA page allocated.
> >  >  * min(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE),
> > VM_KMEM_SIZE_MAX)
> >                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> >  >  * is the total KVA space allocated for kmem_map.
> >  >  */
> >
> > VM_KMEM_SIZE_SCALE is used to autoscale the value in this range:
> > VM_KMEM_SIZE <= vm_kmem_size <= VM_KMEM_SIZE_MAX
> >
> > This ensures we have a reasonable minimum (VM_KMEM_SIZE) and maximum
> > (VM_KMEM_SIZE_MAX) while making a fair effort at efficiently utilizing
> > available memory (Physical memory/VM_KMEM_SIZE_SCALE).
>
> 	Thanks.  So it's easier to understand now.  I'm getting the
> following panic only when I run the following script after like a few
> hours of uptime but works fine if I do it within 30 minutes of uptime...
> /sbin/mount /dev/ad2s1a /mnt/root
> /sbin/mount /dev/ad2s1d /mnt/usr
> killall -9 sendmail
> cd /mnt/root
> /bin/chflags -R noschg .
> /bin/rm -rf .*
> /bin/rm -rf *
> /sbin/dump -L -f- /|restore -rf-
> cd /mnt/usr
> /bin/chflags -R noschg .
> /bin/rm -rf .*
> /bin/rm -rf *
> /sbin/dump -L -f- /usr|restore -rf-
> /usr/sbin/sendmail -L sm-mta -bd -q1m
> /usr/sbin/sendmail -L sm-queue -q1m
> /usr/sbin/sendmail -L sm-msp-queue -Ac -q1m
> /usr/sbin/sendmail -L sm-mta-submit -bd -q1m
> -ODaemonPortOptions=Addr=localhost
>
> panic: kmem_malloc (4096): kmem_map too small: 377487360 total allocated
>        at line 341 in file /usr/src/sys/vm/vm_kern.c
> cpuid=0;
> Debugger("panic")
> Stopped at Debugger+0x46: xchgl %ebx, in_Debugger.0
>
> 	It seems to do it on the dump of /usr and restoring to /mnt/usr.
> I have tried the following but they panic the kernel as soon as the memory
> size is displayed.
>
> added to kernel config:
> options         VM_KMEM_SIZE_MAX=(768*1048576)
> options         VM_KMEM_SIZE_SCALE=2
>
> Tried it on a kernel without the above but added in /boot/loader.conf
>
> vm.kmem_size=429391872
>
> and they both crashed at the same spot as well...
>
> CPU: Mobile Intel(R) Pentium(R) 4 - M CPU 2.60GHz (2592.36-MHz 686-class CPU)
>   Origin = "GenuineIntel"  Id = 0xf29  Stepping = 9
>
> Features=0xbfebf9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,P
> AT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
> real memory  = 2147360768 (2047 MB)
> avail memory = 2095669248 (1998 MB)
>
> 	Any ideas how to fix this?

	I managed to get the system not panicing on bootup if I set the
VM_KMEM_SIZE_MAX to 384MB.  At 512MB and 768MB, it would panic but anyone
knows what the default VM_KMEM_SIZE_MAX size is?


Cheers,
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