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From: Anton Blanchard <anton@samba.org>
To: Jack Steiner <steiner@sgi.com>
Cc: Jes Sorensen <jes@trained-monkey.org>,
	Alexander Viro <viro@math.psu.edu>, Andrew Morton <akpm@osdl.org>,
	"William Lee Irwin, III" <wli@holomorphy.com>,
	linux-kernel@vger.kernel.org, jbarnes@sgi.com
Subject: Re: hash table sizes
Date: Wed, 26 Nov 2003 18:25:53 +1100	[thread overview]
Message-ID: <20031126072553.GF26811@krispykreme> (raw)
In-Reply-To: <20031125231108.GA5675@sgi.com>


> That was a concern to me too. However, on IA64, all page structs are
> in the vmalloc region (it isnt allocated by vmalloc but is in the same
> region as vmalloc'ed pages. They are mapped with 16k pages instead of
> the 64MB pages used for memory allocated by kmalloc).
> 
> Before switching to 16K pages for the page structs, we made numerous
> performance measurements. As far as we could tell, there was no
> performce degradation caused by the smaller pages. It seems to me that
> if page structs are ok being mapped by 16k pages, the hash tables
> would be ok too. 

OK, on ppc64 with a 4kB base pagesize Id be more worried about using the
vmalloc region.

Anton

  parent reply	other threads:[~2003-11-26 22:17 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-11-25 13:35 hash table sizes Jes Sorensen
2003-11-25 13:42 ` William Lee Irwin III
2003-11-25 13:54   ` Jes Sorensen
2003-11-25 16:25     ` Thomas Schlichter
2003-11-25 17:52       ` Antonio Vargas
2003-11-25 17:54         ` William Lee Irwin III
2003-11-25 20:48 ` Jack Steiner
2003-11-25 21:07   ` Andrew Morton
2003-11-25 21:14     ` Jesse Barnes
2003-11-25 21:24       ` Andrew Morton
2003-11-26  2:14         ` David S. Miller
2003-11-26  5:27         ` Matt Mackall
2003-11-28 14:15         ` Jes Sorensen
2003-11-28 14:52           ` Jack Steiner
2003-11-28 16:22             ` Jes Sorensen
2003-11-28 19:35               ` Jack Steiner
2003-11-28 21:18                 ` Jörn Engel
2003-12-01  9:46                   ` Jes Sorensen
2003-12-01 21:06     ` Anton Blanchard
2003-12-01 22:57       ` Martin J. Bligh
2003-11-25 21:16   ` Anton Blanchard
2003-11-25 23:11     ` Jack Steiner
2003-11-26  3:39       ` Rik van Riel
2003-11-26  3:59         ` William Lee Irwin III
2003-11-26  4:25           ` Andrew Morton
2003-11-26  4:23             ` William Lee Irwin III
2003-11-26  5:14           ` Martin J. Bligh
2003-11-26  9:51             ` William Lee Irwin III
2003-11-26 16:17               ` Martin J. Bligh
2003-11-26  7:25       ` Anton Blanchard [this message]
2003-11-26  5:53 Zhang, Yanmin
2003-11-29 10:39 Manfred Spraul

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