| To: | "Bradley C. Kuszmaul" <kuszmaul@xxxxxxxxx> |
|---|---|
| Subject: | Re: hole punching performance |
| From: | Dave Chinner <david@xxxxxxxxxxxxx> |
| Date: | Wed, 16 Jan 2013 11:00:52 +1100 |
| Cc: | Florian Weimer <fw@xxxxxxxxxxxxx>, Ben Myers <bpm@xxxxxxx>, xfs@xxxxxxxxxxx |
| Delivered-to: | xfs@xxxxxxxxxxx |
| In-reply-to: | <CAKSyJXfs-vfUKybDiQR2mSdP18am06CHsx0io6bF9HLWmvWoFA@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> <20130115225435.GB2498@dastard> <CAKSyJXfs-vfUKybDiQR2mSdP18am06CHsx0io6bF9HLWmvWoFA@xxxxxxxxxxxxxx> |
| User-agent: | Mutt/1.5.21 (2010-09-15) |
On Tue, Jan 15, 2013 at 06:33:54PM -0500, Bradley C. Kuszmaul wrote: > So my understanding is that the first time I do a read() I'll have to read > the extents. My writes are on the order of a megabyte, a 250MB file will > likely require an extra I/O to open. That's fine. write size != extent size. Extents on XFS on a 4k block size filesystem can be up to 8GB in size. It's entirely likely that your 250MB file is a single extent an dhence has no extra overhead on read. Use xfs_bmap to check. Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx |
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