Date: Mon, 04 Feb 2002 13:07:30 +1100 From: Peter Jeremy <peter.jeremy@alcatel.com.au> To: Sergey Gershtein <sg@ur.ru> Cc: freebsd-stable@FreeBSD.ORG Subject: Re: Strange lock-ups during backup over nfs after adding 1024M RAM Message-ID: <20020204130730.B72285@gsmx07.alcatel.com.au> In-Reply-To: <1427021336.20020201123650@ur.ru>; from sg@ur.ru on Fri, Feb 01, 2002 at 12:36:50PM %2B0500 References: <20020126204941.H17540-100000@resnet.uoregon.edu> <1931130530386.20020128130947@ur.ru> <20020130073449.B78919@gsmx07.alcatel.com.au> <791310002584.20020130150111@ur.ru> <20020131111153.Y72285@gsmx07.alcatel.com.au> <1427021336.20020201123650@ur.ru>
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On 2002-Feb-01 12:36:50 +0500, Sergey Gershtein <sg@ur.ru> wrote:
>Here's what "vmstat -m" says about "FFS node":
>
>Memory statistics by type Type Kern
> Type InUse MemUse HighUse Limit Requests Limit Limit Size(s)
> ...
> FFS node152293 76147K 76479K102400K 3126467 0 0 512
> ...
One oddity here is the Size - "FFS node" is used to allocate struct
inode's and they should be 256 bytes on i386. Are you using something
other than an i386 architecture? Unless this is a cut-and-paste
error, I suspect something is radically wrong with your kernel.
>And this is even without the backup and the lock-up. Definitely "FFS
>node" is hitting the limit while all other values are far below
>limits. Could you tell me how I can increase "FFS node" limit further?
By default, the memory limit is 1/2 vm_kmem_size, which is 1/3 physical
memory, capped to 200MB. Which means you've hit the default cap.
You can increase this limit with the loader environment
kern.vm.kmem.size (see loader(8) for details). (This is also capped
at twice the physical memory - which won't affect you). Before you go
overboard increasing this, note that the kernel virtual address space
is only 1GB.
How many open files do you expect on your box? Is it reasonable for
there to be >150,000 active inodes? Does "vfscache" have around the
same number of InUse entries as "FFS node"? What is the output of
"sysctl vfs"?
Peter
PS: I'm still hoping that one of the FS gurus will step in and point
out what's wrong.
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