From: Christoph Hellwig <hch@infradead.org>
To: Barry Naujok <bnaujok@sgi.com>
Cc: Christoph Hellwig <hch@infradead.org>,
xfs@oss.sgi.com, linux-fsdevel@vger.kernel.org, aia21@cantab.net
Subject: Re: [PATCH 3/4] XFS: Return case-insensitive match for dentry cache
Date: Thu, 15 May 2008 00:57:00 -0400 [thread overview]
Message-ID: <20080515045700.GA4328@infradead.org> (raw)
In-Reply-To: <op.ua4wa7t03jf8g2@pc-bnaujok.melbourne.sgi.com>
On Wed, May 14, 2008 at 05:55:45PM +1000, Barry Naujok wrote:
> Not quite sure if this is the right test, but I did 1000 creates on
> a brand new filesystem with and without ci on my SATA drive, both
> sustained almost 600 creates per second.
>
> I believe creates would be the worst case scenario for not adding
> negative dentries?
No, negative dentries shouldn't have any effect on that. negative
entries help to optimize away lookups. E.g. thing of the PATH variable
and say your shell is not in the first directory listed there. Having
a negative dentry for it means that you don't have to do a lookup in
the first directories everytime someone wants to use the shell.
next prev parent reply other threads:[~2008-05-15 4:57 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-13 7:57 [PATCH 0/4] XFS: Case-insensitive support - ASCII only Barry Naujok
2008-05-13 7:57 ` [PATCH 1/4] XFS: Name operation vector for hash and compare Barry Naujok
2008-05-13 8:31 ` Christoph Hellwig
2008-05-13 7:57 ` [PATCH 2/4] XFS: add op_flags field and helpers to xfs_da_args Barry Naujok
2008-05-13 8:34 ` Christoph Hellwig
2008-05-14 6:12 ` Barry Naujok
2008-05-13 7:57 ` [PATCH 3/4] XFS: Return case-insensitive match for dentry cache Barry Naujok
2008-05-13 8:57 ` Christoph Hellwig
2008-05-14 6:15 ` Barry Naujok
2008-05-14 7:55 ` Barry Naujok
2008-05-15 4:57 ` Christoph Hellwig [this message]
2008-05-15 5:14 ` Barry Naujok
2008-05-15 13:43 ` Anton Altaparmakov
2008-05-15 14:11 ` Christoph Hellwig
2008-05-16 0:30 ` Barry Naujok
2008-05-16 7:25 ` Anton Altaparmakov
2008-05-20 2:24 ` Barry Naujok
2008-05-20 18:23 ` Christoph Hellwig
2008-05-20 20:50 ` Sunil Mushran
2008-05-13 7:57 ` [PATCH 4/4] XFS: ASCII case-insensitive support Barry Naujok
2008-05-13 8:58 ` Christoph Hellwig
-- strict thread matches above, loose matches on Subject: below --
2008-05-14 7:52 [PATCH 0/4] XFS: ASCII case-insensitivity support Barry Naujok
2008-05-14 7:52 ` [PATCH 3/4] XFS: Return case-insensitive match for dentry cache Barry Naujok
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