[issue1552] 'hammer rebalance' stalls fs
Matthew Dillon
dillon at apollo.backplane.com
Thu Oct 8 19:11:09 PDT 2009
:New submission from Thomas Nikolajsen <thomas.nikolajsen at mail.dk>:
:
:dfly 2.4.1
:Running 'hammer cleanup' stalls fs during 'hammer .. rebalance ..';
:wchan: newbuf (^T):
:disk activity stops & other commands using fs stalls.
:
:Core dump *.42 uploaded to leaf.
:(verbose boot & 'hammer -vvv clean' used for this dump)
:
:Info: hammer fs upgraded to v2 after 2.4.0 install,
:didn't use 'hammer rebalance' on fs before 2.4.0.
:'hammer cleanup' run on daily basis on fs;
:didn't see this problem the first few days.
:
:----------
:messages: 7537
:nosy: thomas.nikolajsen
:status: unread
:title: 'hammer rebalance' stalls fs
Thomas, this core seems to be for a system with 128M of ram.
Is the stall only occurring when the amount of ram is set that low
or did you set it low to get the crash dump?
We might be hitting up against a base memory requirement for
running HAMMER, or perhaps some of the limit calculations are
hitting degenerate cases with such a small buffer cache available.
-Matt
Matthew Dillon
<dillon at backplane.com>
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