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?
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