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16061@apollo.backplane.com>
From: Francois Tigeot <ftigeot@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

-- 
Francois Tigeot