Re: [issue1552] 'hammer rebalance' stalls fs

[Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxx>]

:New submission from Thomas Nikolajsen <thomas.nikolajsen@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@backplane.com>