Re: [PATCH v3 0/5]add new ioctls to do metadata readahead in btrfs

[Shaohua Li <shaohua.li@xxxxxxxxx>]

On Thu, 2011-01-20 at 05:33 +0800, David Nicol wrote:
> On Wed, Jan 19, 2011 at 2:34 PM, Andrew Morton
> <akpm@xxxxxxxxxxxxxxxxxxxx> 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.


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