linux-ext4 - Re: mdadm software raid + ext4, capped at ~350MiB/s limitation/bug?

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Message-ID: <alpine.DEB.2.00.1002280958540.22822@p34.internal.lan>
Date:	Sun, 28 Feb 2010 10:00:06 -0500 (EST)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	Bill Davidsen <davidsen@....com>
cc:	Neil Brown <neilb@...e.de>, linux-kernel@...r.kernel.org,
	linux-raid@...r.kernel.org, linux-ext4@...r.kernel.org,
	Alan Piszcz <ap@...arrain.com>
Subject: Re: mdadm software raid + ext4, capped at ~350MiB/s
 limitation/bug?



On Sun, 28 Feb 2010, Bill Davidsen wrote:

> Justin Piszcz wrote:
>>

[ .. ]

>> fdatasync:
>> http://lkml.indiana.edu/hypermail/linux/kernel/1002.3/01507.html
>> 
> I wasn't expecting a huge change in value, your data size is large. But 
> thanks, the total time without sync can be off by at least seconds, making it 
> hard to duplicate results. You missed nothing this time.
>
> Did you use any of the options with ext4? I found about 15-20% with options, 
> but I didn't take good enough notes to quote now. :-(
> That doesn't mean there wasn't more, I tested on FC9, ext4 was experimental 
> then.

Yes:

I tried nearly every option in the ext4 readme:

more:

p63:~# tune2fs -o journal_data_writeback /dev/md0
tune2fs 1.41.10 (10-Feb-2009)
p63:~# mount /dev/md0 /r1 -o noatime,barrier=0,data=writeback,nobh,commit=100,nouser_xattr
p63:~#

p63:~# cd /r1
p63:/r1# dd if=/dev/zero of=file bs=1M count=10240
10240+0 records in
10240+0 records out
10737418240 bytes (11 GB) copied, 35.7193 s, 301 MB/s
p63:/r1#

p63:~# mount /dev/md0 /r1 -o noatime,barrier=0,data=writeback,nobh,commit=100,nouser_xattr,nodelalloc
p63:~#
p63:/r1# dd if=/dev/zero of=file bs=1M count=10240
10240+0 records in
10240+0 records out
10737418240 bytes (11 GB) copied, 30.5846 s, 351 MB/s
p63:/r1#

p63:~# mount /dev/md0 /r1 -o noatime,barrier=0,data=writeback,nobh,commit=100,nouser_xattr,nodelalloc,max_batch_time=0
p63:~#
p63:/r1# dd if=/dev/zero of=file bs=1M count=10240
10240+0 records in
10240+0 records out
10737418240 bytes (11 GB) copied, 30.8501 s, 348 MB/s
p63:/r1#

p63:~# mount /dev/md0 /r1 -o noatime,barrier=0,data=writeback,nobh,commit=100,nouser_xattr,nodelalloc,min_batch_time=10000
p63:~#
p63:/r1# dd if=/dev/zero of=file bs=1M count=10240
10240+0 records in
10240+0 records out
10737418240 bytes (11 GB) copied, 31.0127 s, 346 MB/s
p63:/r1#

p63:~# mount /dev/md0 /r1 -o noatime,barrier=0,data=writeback,nobh,commit=100,nouser_xattr,nodelalloc,journal_ioprio=0
p63:~#
p63:/r1# dd if=/dev/zero of=file bs=1M count=10240
10240+0 records in
10240+0 records out
10737418240 bytes (11 GB) copied, 31.1559 s, 345 MB/s
p63:/r1# cd


p63:~# mount /dev/md0 /r1 -o noatime,barrier=0,data=writeback,nobh,commit=100,nouser_xattr,nodelalloc,journal_ioprio=7
p63:~#
p63:/r1# dd if=/dev/zero of=file bs=1M count=10240
10240+0 records in
10240+0 records out
10737418240 bytes (11 GB) copied, 31.4713 s, 341 MB/s
p63:/r1#

p63:~# mount /dev/md0 /r1 -o noatime,barrier=0,data=writeback,nobh,commit=100,nouser_xattr,nodelalloc,journal_async_commit
p63:~#
p63:/r1# dd if=/dev/zero of=file bs=1M count=10240
10240+0 records in
10240+0 records out
10737418240 bytes (11 GB) copied, 30.7633 s, 349 MB/s
p63:/r1#

p63:~# mount /dev/md0 /r1 -o noatime,barrier=0,data=writeback,nobh,commit=100,nouser_xattr,nodelalloc,journal_async_commit,oldalloc
p63:~#
p63:/r1# dd if=/dev/zero of=file bs=1M count=10240
10240+0 records in
10240+0 records out
10737418240 bytes (11 GB) copied, 30.7607 s, 349 MB/s
p63:/r1#

p63:~# mount /dev/md0 /r1 -o noatime,barrier=0,data=writeback,nobh,commit=100,nouser_xattr,nodelalloc,journal_async_commit,stripe=1024
p63:~#

Justin.

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