From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Anton Blanchard <anton@samba.org>
Cc: linuxppc-dev@ozlabs.org
Subject: Re: [PATCH] Enable hashdist by default on PowerPC
Date: Wed, 18 Feb 2009 16:41:07 +1100 [thread overview]
Message-ID: <1234935667.14060.440.camel@pasglop> (raw)
In-Reply-To: <20090218051112.GA32195@kryten>
> 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.
>
> Signed-off-by: Anton Blanchard <anton@samba.org>
> ---
You have numbers ? :-) I'm asking mostly because I've been wondering
whether it offsets the 16M pages vs. 4K or 64K pages in term of TLB/ERAT
impact.
Cheers,
Ben.
> diff --git a/include/linux/bootmem.h b/include/linux/bootmem.h
> index 95837bf..c0c63ee 100644
> --- a/include/linux/bootmem.h
> +++ b/include/linux/bootmem.h
> @@ -145,9 +145,10 @@ extern void *alloc_large_system_hash(const char *tablename,
> #define HASH_EARLY 0x00000001 /* Allocating during early boot? */
>
> /* Only NUMA needs hash distribution.
> - * IA64 and x86_64 have sufficient vmalloc space.
> + * IA64, x86_64 and PowerPC have sufficient vmalloc space.
> */
> -#if defined(CONFIG_NUMA) && (defined(CONFIG_IA64) || defined(CONFIG_X86_64))
> +#if defined(CONFIG_NUMA) && (defined(CONFIG_IA64) || defined(CONFIG_X86_64) || \
> + defined(CONFIG_PPC64))
> #define HASHDIST_DEFAULT 1
> #else
> #define HASHDIST_DEFAULT 0
> _______________________________________________
> Linuxppc-dev mailing list
> Linuxppc-dev@ozlabs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-dev
next prev parent reply other threads:[~2009-02-18 5:41 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 [this message]
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
2009-03-03 5:27 ` Benjamin Herrenschmidt
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