From: Shaohua Li <shaohua.li-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
To: David Nicol <davidnicol-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: Andrew Morton
<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
"linux-btrfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-btrfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Chris Mason <chris.mason-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>,
Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
Arjan van de Ven <arjan-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
"Yan,
Zheng" <zheng.z.yan-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>,
"Wu,
Fengguang" <fengguang.wu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
linux-api <linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
manpages <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: [PATCH v3 0/5]add new ioctls to do metadata readahead in btrfs
Date: Thu, 20 Jan 2011 10:27:13 +0800 [thread overview]
Message-ID: <1295490433.1949.886.camel@sli10-conroe> (raw)
In-Reply-To: <AANLkTimJ8ufoaM2GMDkUU=cjz19QtpihrgLNjjZN8m=1@mail.gmail.com>
On Thu, 2011-01-20 at 05:33 +0800, David Nicol wrote:
> On Wed, Jan 19, 2011 at 2:34 PM, Andrew Morton
> <akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org> wrote:
>
> > It would be much more valuable if those 3.5 seconds were available to
> > devices which really really care about bootup times, but very few of
> > those devices use rotating disks nowadays, I expect?
>
> And don't rotating disk modules read and buffer whole tracks, doing
> their own readahead, anymore, anyway? Isn't that part of what "on-disk
> cache" does?
The disk readahead and the metadata readahead is completely different,
you didn't even look at the patch or log before saying this.
next prev parent reply other threads:[~2011-01-20 2:27 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-19 1:15 [PATCH v3 0/5]add new ioctls to do metadata readahead in btrfs Shaohua Li
2011-01-19 20:34 ` Andrew Morton
2011-01-19 21:33 ` David Nicol
2011-01-20 2:27 ` Shaohua Li [this message]
[not found] ` <20110119123451.75bb3c76.akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
2011-01-20 2:34 ` Shaohua Li
2011-01-20 2:46 ` Andrew Morton
[not found] ` <20110119184636.fed233a7.akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
2011-01-20 2:58 ` Shaohua Li
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