From: "David S. Miller" <davem@redhat.com>
To: akpm@zip.com.au
Cc: ak@suse.de, anton@samba.org, mingo@elte.hu, linux-kernel@vger.kernel.org
Subject: Re: speed difference between using hard-linked and modular drives?
Date: Thu, 08 Nov 2001 23:24:25 -0800 (PST) [thread overview]
Message-ID: <20011108.232425.21928928.davem@redhat.com> (raw)
In-Reply-To: <3BEB82B8.541558CA@zip.com.au>
In-Reply-To: <3BEB7DA6.BC8793B1@zip.com.au> <20011108.231717.85686073.davem@redhat.com> <3BEB82B8.541558CA@zip.com.au>
From: Andrew Morton <akpm@zip.com.au>
Date: Thu, 08 Nov 2001 23:16:08 -0800
Well on my setup, there are more hash buckets than there are
pages in the system. So - basically empty. If memory serves
me, never more than two pages in a bucket.
Ok, this is what I expected. The function is tuned for
having N_HASH_CHAINS being roughly equal to N_PAGES.
If you want to experiment with smaller hash tables, there
are some hacks in the FreeBSD sources that choose a different "salt"
per inode. You xor the salt into the hash for each page on that
inode. Something like this...
Franks a lot,
David S. Miller
davem@redhat.com
next prev parent reply other threads:[~2001-11-09 7:25 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.LNX.4.33.0111081802380.15975-100000@localhost.localdomain.suse.lists.linux.kernel>
[not found] ` <Pine.LNX.4.33.0111081836080.15975-100000@localhost.localdomain.suse.lists.linux.kernel>
2001-11-08 23:00 ` speed difference between using hard-linked and modular drives? Andi Kleen
2001-11-09 0:05 ` Anton Blanchard
2001-11-09 5:45 ` Andi Kleen
2001-11-09 6:04 ` David S. Miller
2001-11-09 6:39 ` Andi Kleen
2001-11-09 6:54 ` Andrew Morton
2001-11-09 7:17 ` David S. Miller
2001-11-09 7:16 ` Andrew Morton
2001-11-09 7:24 ` David S. Miller [this message]
2001-11-09 8:21 ` Ingo Molnar
2001-11-09 7:35 ` Andrew Morton
2001-11-09 7:44 ` David S. Miller
2001-11-09 7:14 ` David S. Miller
2001-11-09 7:16 ` David S. Miller
2001-11-09 12:59 ` Alan Cox
2001-11-09 12:54 ` David S. Miller
2001-11-09 13:15 ` Philip Dodd
2001-11-09 13:26 ` David S. Miller
2001-11-09 20:45 ` Mike Fedyk
2001-11-09 13:17 ` Andi Kleen
2001-11-09 13:25 ` David S. Miller
2001-11-09 13:39 ` Andi Kleen
2001-11-09 13:41 ` David S. Miller
2001-11-10 5:20 ` Anton Blanchard
2001-11-10 4:56 ` Anton Blanchard
2001-11-10 5:09 ` Andi Kleen
2001-11-10 13:29 ` David S. Miller
2001-11-10 13:44 ` David S. Miller
2001-11-10 13:52 ` David S. Miller
2001-11-10 14:29 ` Numbers: ext2/ext3/reiser Performance (ext3 is slow) Oktay Akbal
2001-11-10 14:47 ` arjan
2001-11-10 17:41 ` Oktay Akbal
2001-11-10 17:56 ` Arjan van de Ven
2001-11-15 17:24 ` Stephen C. Tweedie
2001-11-12 16:59 ` [patch] arbitrary size memory allocator, memarea-2.4.15-D6 Ingo Molnar
2001-11-12 18:19 ` Jeff Garzik
2001-11-12 23:26 ` Ingo Molnar
2001-11-13 15:59 ` Riley Williams
2001-11-14 20:49 ` Tom Gall
2001-11-15 1:11 ` Anton Blanchard
2001-11-17 18:00 ` Eric W. Biederman
2001-11-09 3:12 ` speed difference between using hard-linked and modular drives? Rusty Russell
2001-11-09 5:59 ` Andi Kleen
2001-11-09 11:16 ` Helge Hafting
2001-11-12 9:59 ` Rusty Russell
2001-11-12 23:23 ` David S. Miller
2001-11-12 23:14 ` Rusty Russell
2001-11-13 1:30 ` Mike Fedyk
2001-11-13 1:15 ` David Lang
2001-11-08 16:01 Roy Sigurd Karlsbakk
2001-11-08 17:02 ` Ingo Molnar
2001-11-08 17:37 ` Ingo Molnar
2001-11-08 23:59 ` Anton Blanchard
2001-11-09 5:11 ` Keith Owens
2001-11-10 3:35 ` Anton Blanchard
2001-11-10 7:26 ` Keith Owens
2001-11-08 17:53 ` Robert Love
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