Re: What is the minimal memory requirement for HAMMER?

[Chris Turner <c.turner@xxxxxxxxxxxxxxxxxxx>]

This value is tunable - an old P4/512Mb box required me to do the below
locally, which alleviated the issue (though did impact running memory)

See also the description in the LINT config / your current running values
based on your warning looks like you'll want to try 4096 or so if your
system can afford it.

(not sure if this has to be ^2 but always good to assume things do when
 dealing with kernel knobs)

Cheers,

- Chris

$ git diff GENERIC
diff --git a/sys/config/GENERIC b/sys/config/GENERIC
index e117741..7a1e790 100644
--- a/sys/config/GENERIC
+++ b/sys/config/GENERIC
@@ -4,6 +4,10 @@
 # Check the LINT configuration file in sys/config, for an
 # exhaustive list of options.

+# dev02 low memory / hammer cleanup hack
+options                NBUF=8192
+#end dev02 low memory / hammer cleanup hack
+
 platform       pc32
 machine                i386
 machine_arch   i386



On 12/20/11 11:39, Zenny wrote:
> Hi:
>
> I am trying to experiment with HAMMER with a spare PIII/500Mhz old
> machine with 256MB of RAM. I installed the RELEASE-2.10 version of
> DFBSD.  But when I try to execute "hammer cleanup", it spits out an
> error that reads:
>
> "hammer: System has insufficient buffers to rebalance the tree.  nbuf<  3969"
>
> However, when I checked in the archive of the mailinglist
> (http://leaf.dragonflybsd.org/mailarchive/users/2010-03/msg00057.html),
> it states that 128MB is the minimal requirement, right?!
>
> In that case the hw that I am using exceeds the minimal requirement
> and still spits out the error, which reportedly due to the low memory
> (http://leaf.dragonflybsd.org/mailarchive/users/2011-05/msg00074.html)
>
> Please throw some light! (Very dark here in Scandinavia during winters
> like this) ;-)