Sun Mar 21 12:40:06 PDT 2010
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From: Francois Tigeot <ftigeot at wolfpond.org>
Subject: Re: Machine unresponsive with cache_lock: blocked on... message
Date: Sun, 21 Mar 2010 20:38:56 +0100
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On Sun, Mar 21, 2010 at 12:14:11PM -0700, Matthew Dillon wrote:
> :> Try setting it to 40 (it defaults to 23). The max value is 64
> :> which will effectively put all non-memory-mapped file data on the
> :> inactive queue, including any data which is repeatedly accessed.
> :Done. I raised it previously to 30 (I think) and still had a crash.
> It wouldn't effect the crash condition, which was a low memory
> condition generated by cache+free followed by a deadlock. The
> cycle point only effects active vs inactive.
> But raising the cycle point should reduce the degree by which
> active program memory is swapped out. On the flip-side, the
> cost of doing this is that file data may be thrown out too quickly.
> That is, cacheable file data will be mixed in with uncacheable
> file data in the inactive queue and we'll be throwing the baby out
> with the dishwater, so to speak.
> I'd like to know if this solves your particular problem (the paging
> issue, not the crashing issue), and if so I will change the default
> cycle point for the release. So play with it.
We'll see. For now, there's a rsync backup running and the paging activity
seems to get more intense:
Memory: 473M Active, 1038M Inact, 441M Wired, 46M Cache, 199M Buf, 3380K Free
Swap: 4096M Total, 149M Used, 3947M Free, 3% Inuse, 4336K Out
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