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Message-ID: <20071105185133.GA3900@webber.adilger.int>
Date: Tue, 6 Nov 2007 02:51:33 +0800
From: Andreas Dilger <adilger@....com>
To: Eric Sandeen <sandeen@...hat.com>
Cc: Alex Tomas <bzzz.tomas@...il.com>,
ext4 development <linux-ext4@...r.kernel.org>,
Kalpak Shah <Kalpak.Shah@....COM>
Subject: Re: delalloc fragmenting files?
On Nov 05, 2007 11:37 -0600, Eric Sandeen wrote:
> Alex Tomas wrote:
> > thanks for the data. the attached patch should fix couple issues:
> > broken history output and policy in that smaller usable chunk to
> > be used. can you give it a spin, please?
>
> This looks *much* better:
>
> First block: 100355
> Last block: 2342657
> Discontinuity: Block 30208 is at 133120 (was 130562)
> Discontinuity: Block 60928 is at 165891 (was 163839)
> Discontinuity: Block 90368 is at 197634 (was 195330)
> Discontinuity: Block 121856 is at 232448 (was 229121)
> Discontinuity: Block 150528 is at 263170 (was 261119)
> Discontinuity: Block 181504 is at 296963 (was 294145)
> Discontinuity: Block 210944 is at 328706 (was 326402)
> Discontinuity: Block 241664 is at 361474 (was 359425)
> Discontinuity: Block 272896 is at 395264 (was 392705)
> Discontinuity: Block 303360 is at 427010 (was 425727)
> Discontinuity: Block 334080 is at 459778 (was 457729)
> Discontinuity: Block 365568 is at 493568 (was 491265)
> Discontinuity: Block 395264 is at 525314 (was 523263)
> Discontinuity: Block 426240 is at 558082 (was 556289)
> ....
On a related note - the FIEMAP patches to filefrag also include a new
output format that is much more useful, IMHO. The new format is like:
{filename}
ext: [logical start.. end kB]: phys start..end kB : kB:lun: flags
0: [ 0.. 30207]: 401416.. 522251: 120828: 0 :
1: [ 30208.. 60927]: 532480.. 655359: 122880: 0 :
2: [ 60928.. 121855]: 790536.. 916484: 125948: 0 :
Hopefully Kalpak will be able to post the updated patches here soon.
Cheers, Andreas
--
Andreas Dilger
Sr. Software Engineer, Lustre Group
Sun Microsystems of Canada, Inc.
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