| To: | "Bradley C. Kuszmaul" <kuszmaul@xxxxxxxxx> |
|---|---|
| Subject: | Re: hole punching performance |
| From: | Dave Chinner <david@xxxxxxxxxxxxx> |
| Date: | Wed, 16 Jan 2013 09:54:35 +1100 |
| Cc: | Florian Weimer <fw@xxxxxxxxxxxxx>, Ben Myers <bpm@xxxxxxx>, xfs@xxxxxxxxxxx |
| Delivered-to: | xfs@xxxxxxxxxxx |
| In-reply-to: | <CAKSyJXdejNhNgqq6g8N4n6Cjz2s3+m=JUvanTRfDtF72d2RxFg@xxxxxxxxxxxxxx> |
| References: | <CAKSyJXf66H2U-BF-aYnSr2fF24_6LJw6swOx1RhUc_3Eqayaiw@xxxxxxxxxxxxxx> <87pq195t8q.fsf@xxxxxxxxxxxxxxxxx> <CAKSyJXfQsmemZ3H9A92UezsPCXfn37LXP3tpPMkiwtvR4=eY2g@xxxxxxxxxxxxxx> <20130113194941.GB27055@xxxxxxx> <20130113225545.GA19173@dastard> <87mwwaqgkj.fsf@xxxxxxxxxxxxxxxxx> <CAKSyJXdejNhNgqq6g8N4n6Cjz2s3+m=JUvanTRfDtF72d2RxFg@xxxxxxxxxxxxxx> |
| User-agent: | Mutt/1.5.21 (2010-09-15) |
On Tue, Jan 15, 2013 at 04:34:50PM -0500, Bradley C. Kuszmaul wrote: > So does it cost a lot to read all the extents just to read the first block? Depends on the number of extents in the file. Figure an IO per 250 extents for a 4k block size filesystem (extent records are 16 bytes in size on disk). Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx |
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