Date: Sat, 6 Mar 2004 20:46:41 -1000 (HST) From: Vincent Poy <vince@oahu.WURLDLINK.NET> To: Jon Noack <noackjr@alumni.rice.edu> Cc: current@freebsd.org Subject: Re: -CURRENT kernel panic Message-ID: <20040306204553.H8264-100000@oahu.WURLDLINK.NET> In-Reply-To: <20040306191221.W8264-100000@oahu.WURLDLINK.NET>
next in thread | previous in thread | raw e-mail | index | archive | help
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,
Vince - vince@WURLDLINK.NET - Vice President ________ __ ____
Unix Networking Operations - FreeBSD-Real Unix for Free / / / / | / |[__ ]
WurldLink Corporation / / / / | / | __] ]
San Francisco - Honolulu - Hong Kong / / / / / |/ / | __] ]
HongKong Stars/Gravis UltraSound Mailing Lists Admin /_/_/_/_/|___/|_|[____]
Almighty1@IRC - oahu.DAL.NET Hawaii's DALnet IRC Network Server Admin
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20040306204553.H8264-100000>