Justin Piszcz wrote:2.6.33/x86_64Hello,
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?
Only default options were used except the mount options. If that is the
Were the filesystems created to align with raid geometry?
How recent?
mkfs.xfs has done that forever; mkfs.ext4 only will do so (automatically)
with recent kernel+e2fsprogs.