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Re: System has insufficient buffers to rebalance the tree

From: Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxx>
Date: Mon, 31 Jan 2011 13:17:11 -0800 (PST)

:On Sunday 30 January 2011 22:43:01 Matthew Dillon wrote:
:> :I still get this warning. Is it ever going to be fixed?
:> :
:> :Pierre
:>     I could remove the kprintf I guess and have it just reported by
:>     hammer cleanup.
:Is the number of buffers something I can change, or is it determined by the 
:kernel based on memory size?

   It's based on memory size and while it is possible to change it the
   problem is that your system doesn't have enough memory for what the
   hammer rebalance code really needs to operate.

   Part of this is that the rebalance algorithm simply requires a huge number
   of concurrent buffers.  Ultimately the fix would be to change the algorithm
   but it isn't easy to reformulate and I don't really want to break it open
   because one mistake in that code could blow up the filesystem.

					Matthew Dillon 

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