DragonFly bugs List (threaded) for 2008-07
DragonFly BSD
DragonFly bugs List (threaded) for 2008-07
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Re: hammer_alloc_data panic


From: "Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>
Date: Wed, 16 Jul 2008 09:36:51 +0100

Matthew Dillon wrote:
:We absolutely need this. People will complain left and right if it :isn't "just" working.
:
:Probably I'm missing something, but can't we reserve N blocks for :reblocking purposes, so that the reblocker always can make progress?
Yes, but if the filesystem has 60% fragmentation we are talking close
to a gigabyte needing to be reserved (from my testing with Gergo's
wonderfully fragmented 14G filesystem). That clearly will not work very
well for small filesystems.

Why do you need to reserve 1GB? Wouldn't (in theory), one block be enough to be able to make progress?


cheers
  simon




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