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Re: XFS Preallocate using ALLOCSP

To: Smit Shah <getsmit@xxxxxxxxx>
Subject: Re: XFS Preallocate using ALLOCSP
From: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Tue, 16 Jun 2009 12:32:39 -0500
Cc: Felix Blyakher <felixb@xxxxxxx>, linux-xfs@xxxxxxxxxxx
In-reply-to: <8770d98c0906161028j1cc5cbadl49d30092fddf3dbe@xxxxxxxxxxxxxx>
References: <24042506.post@xxxxxxxxxxxxxxx> <4A3712BF.7030101@xxxxxxxxxxx> <8770d98c0906152344p185533a9rc144a5667d13d2de@xxxxxxxxxxxxxx> <4A37B744.9030301@xxxxxxxxxxx> <0B774481-16A5-42FC-89C3-91096E59E861@xxxxxxx> <8770d98c0906161028j1cc5cbadl49d30092fddf3dbe@xxxxxxxxxxxxxx>
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Smit Shah wrote:
> On 6/16/09, Felix Blyakher <felixb@xxxxxxx> wrote:
>> On Jun 16, 2009, at 10:16 AM, Eric Sandeen wrote:

>>> Maybe I should ask what the end goal is here.  :)
> Just to see if preallocation using fallocate helps reducing the
> fragmentation and increases the throughput.  I guess it wll help
> reduce the fragmentation but the write performance is going to suffer.

Depends on the IO you do, I think.  I'd be curious to know exactly how
you're running preallocation & iometer so I could give it a shot, to see
why xfs seems to be doing worse than ext4.


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