From: Justin Piszcz <jpiszcz@lucidpixels.com>
To: Eric Sandeen <sandeen@redhat.com>
Cc: linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org,
Alan Piszcz <ap@solarrain.com>
Subject: Re: EXT4 is ~2X as slow as XFS (593MB/s vs 304MB/s) for writes?
Date: Fri, 26 Feb 2010 20:08:30 -0500 (EST) [thread overview]
Message-ID: <alpine.DEB.2.00.1002262006000.8247@p34.internal.lan> (raw)
In-Reply-To: <4B886CA1.9050906@redhat.com>
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?
next prev parent reply other threads:[~2010-02-27 1:08 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-27 0:31 EXT4 is ~2X as slow as XFS (593MB/s vs 304MB/s) for writes? Justin Piszcz
2010-02-27 0:46 ` Dmitry Monakhov
2010-02-27 1:05 ` Justin Piszcz
2010-02-27 1:05 ` Justin Piszcz
2010-02-28 0:56 ` Asdo
2010-02-28 9:59 ` Justin Piszcz
2010-02-27 0:51 ` Eric Sandeen
2010-02-27 1:08 ` Justin Piszcz [this message]
2010-02-27 1:12 ` Eric Sandeen
2010-02-27 1:28 ` Eric Sandeen
2010-02-27 10:14 ` Justin Piszcz
2010-02-27 10:51 ` Justin Piszcz
2010-02-27 11:09 ` Justin Piszcz
2010-02-27 11:36 ` Justin Piszcz
2010-02-28 5:42 ` tytso
2010-02-28 14:55 ` Justin Piszcz
2010-03-01 8:39 ` Andreas Dilger
2010-03-01 9:21 ` Justin Piszcz
2010-03-01 14:48 ` Michael Tokarev
2010-03-01 15:07 ` Justin Piszcz
2010-03-01 16:15 ` Eric Sandeen
2010-02-28 23:50 ` Dave Chinner
2010-03-02 0:08 ` Eric Sandeen
2010-03-02 0:37 ` Eric Sandeen
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