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Message-ID: <alpine.DEB.2.00.1002262006000.8247@p34.internal.lan> Date: Fri, 26 Feb 2010 20:08:30 -0500 (EST) From: Justin Piszcz <jpiszcz@...idpixels.com> To: Eric Sandeen <sandeen@...hat.com> cc: linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org, Alan Piszcz <ap@...arrain.com> Subject: Re: EXT4 is ~2X as slow as XFS (593MB/s vs 304MB/s) for writes? On Fri, 26 Feb 2010, Eric Sandeen wrote: > Justin Piszcz wrote: >> Hello, >> >> Is it possible to 'optimize' ext4 so it is as fast as XFS for writes? >> I see about half the performance as XFS for sequential writes. >> >> I have checked the doc and tried several options, a few of which are shown >> below (I have also tried the commit/journal_async/etc options but none >> of them get the write speeds anywhere near XFS)? >> >> Sure 'dd' is not a real benchmark, etc, etc, but with 10Gbps between 2 >> hosts I get 550MiB/s+ on reads from EXT4 but only 100-200MiB/s write. >> >> When it was XFS I used to get 400-600MiB/s for writes for the same RAID >> volume. >> >> How do I 'speed' up ext4? Is it possible? > > Aside from Dmitry's suggestion to time sync as well (although for 10G, you are > likely not leaving much in cache) I'd ask: > > What kernel version? what xfsprogs/e2fsprogs version? 2.6.33/x86_64 ii xfsprogs 3.1.1 Utilities for managing the XFS filesystem ii e2fsprogs 1.41.10-1 ext2/ext3/ext4 file system utilities > > Were the filesystems created to align with raid geometry? Only default options were used except the mount options. If that is the culprit, I have some more testing to do, thanks, will look into it. > > mkfs.xfs has done that forever; mkfs.ext4 only will do so (automatically) > with recent kernel+e2fsprogs. How recent? -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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