From: David Miller <davem@davemloft.net>
To: anton@samba.org
Cc: linuxppc-dev@ozlabs.org
Subject: Re: [PATCH] Enable hashdist by default on 64bit NUMA
Date: Thu, 26 Feb 2009 03:34:06 -0800 (PST) [thread overview]
Message-ID: <20090226.033406.60071032.davem@davemloft.net> (raw)
In-Reply-To: <20090226112431.GA25330@kryten>
From: Anton Blanchard <anton@samba.org>
Date: Thu, 26 Feb 2009 22:24:32 +1100
> On PowerPC we allocate large boot time hashes on node 0. This leads to
> an imbalance in the free memory, for example on a 64GB box (4 x 16GB
> nodes):
>
> Free memory:
> Node 0: 97.03%
> Node 1: 98.54%
> Node 2: 98.42%
> Node 3: 98.53%
>
> If we switch to using vmalloc (like ia64 and x86-64) things are more
> balanced:
>
> Free memory:
> Node 0: 97.53%
> Node 1: 98.35%
> Node 2: 98.33%
> Node 3: 98.33%
>
> For many HPC applications we are limited by the free available memory on
> the smallest node, so even though the same amount of memory is used the
> better balancing helps.
>
> Since all 64bit NUMA capable architectures should have sufficient
> vmalloc space, it makes sense to enable it via CONFIG_64BIT.
>
> Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: David S. Miller <davem@davemloft.net>
next prev parent reply other threads:[~2009-02-26 11:34 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-18 5:11 [PATCH] Enable hashdist by default on PowerPC Anton Blanchard
2009-02-18 5:41 ` Benjamin Herrenschmidt
2009-02-18 6:20 ` Anton Blanchard
2009-02-18 9:19 ` David Miller
2009-02-20 5:19 ` Anton Blanchard
2009-02-20 8:03 ` David Miller
2009-02-26 11:24 ` [PATCH] Enable hashdist by default on 64bit NUMA Anton Blanchard
2009-02-26 11:34 ` David Miller [this message]
2009-03-03 5:27 ` Benjamin Herrenschmidt
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