linux-kernel - Re: EXT4 is ~2X as slow as XFS (593MB/s vs 304MB/s) for writes?

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Date:	Fri, 26 Feb 2010 19:12:00 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	Justin Piszcz <jpiszcz@...idpixels.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?

Justin Piszcz wrote:
...

>> 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?

You're recent enough.  :)

mkfs.ext4 output should include the stripe info if it was found.

        printf(_("Block size=%u (log=%u)\n"), fs->blocksize,
                s->s_log_block_size);
        printf(_("Fragment size=%u (log=%u)\n"), fs->fragsize,
                s->s_log_frag_size);
        printf(_("Stride=%u blocks, Stripe width=%u blocks\n"),
               s->s_raid_stride, s->s_raid_stripe_width);
        printf(_("%u inodes, %llu blocks\n"), s->s_inodes_count,
               ext2fs_blocks_count(s));

etc.

-Eric
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