linux-ext4 - Re: [PATCH] Add ext3 data=guarded mode

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Date:	Mon, 20 Apr 2009 15:06:23 +0200
From:	Mike Galbraith <efault@....de>
To:	Amit Shah <amit.shah@...hat.com>
Cc:	Jan Kara <jack@...e.cz>, Theodore Tso <tytso@....edu>,
	Chris Mason <chris.mason@...cle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Developers List <linux-kernel@...r.kernel.org>,
	Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] Add ext3 data=guarded mode

On Mon, 2009-04-20 at 18:26 +0530, Amit Shah wrote:

> I'll re-run the tests later tonight..

I ran ext3 in all journaling modes (one run), and there was spit
difference.

(the mmap test is a bit slow and unfriendly)

marge:..tmp/tmp # ./test-file-zero-alloc-speed 4 /dev/sdf3 /media/root ext3 rw,_netdev,noatime,data=ordered,acl,user_xattr
posix-fallocate run time:
        seconds:microseconds: 1240230249:280060
        seconds:microseconds: 1240230303:989879
        (approx 54s)
mmap run time:
        seconds:microseconds: 1240230304:67286
        seconds:microseconds: 1240230363:882957
        (approx 59s)
4096-sized chunk run time:
        seconds:microseconds: 1240230363:989225
        seconds:microseconds: 1240230419:242924
        (approx 56s)
8192-sized chunk run time:
        seconds:microseconds: 1240230419:365540
        seconds:microseconds: 1240230473:307148
        (approx 54s)
marge:..tmp/tmp # ./test-file-zero-alloc-speed 4 /dev/sdf3 /media/root ext3 rw,_netdev,noatime,data=writeback,acl,user_xattr
posix-fallocate run time:
        seconds:microseconds: 1240230511:276152
        seconds:microseconds: 1240230565:40419
        (approx 54s)
mmap run time:
        seconds:microseconds: 1240230571:139959
        seconds:microseconds: 1240230633:254590
        (approx 62s)
4096-sized chunk run time:
        seconds:microseconds: 1240230639:300132
        seconds:microseconds: 1240230693:95665
        (approx 54s)
8192-sized chunk run time:
        seconds:microseconds: 1240230698:655975
        seconds:microseconds: 1240230753:902749
        (approx 55s)
marge:..tmp/tmp # ./test-file-zero-alloc-speed 4 /dev/sdf3 /media/root ext3 rw,_netdev,noatime,data=guarded,acl,user_xattr
posix-fallocate run time:
        seconds:microseconds: 1240230802:594939
        seconds:microseconds: 1240230856:602117
        (approx 54s)
mmap run time:
        seconds:microseconds: 1240230862:792587
        seconds:microseconds: 1240230924:985089
        (approx 62s)
4096-sized chunk run time:
        seconds:microseconds: 1240230930:827949
        seconds:microseconds: 1240230985:663422
        (approx 55s)
8192-sized chunk run time:
        seconds:microseconds: 1240230991:483085
        seconds:microseconds: 1240231046:601340
        (approx 55s)
marge:..tmp/tmp # ./test-file-zero-alloc-speed 4 /dev/sdf3 /media/root ext3 rw,_netdev,noatime,data=journal,acl,user_xattr
posix-fallocate run time:
        seconds:microseconds: 1240231074:745621
        seconds:microseconds: 1240231128:740106
        (approx 54s)
mmap run time:
        seconds:microseconds: 1240231134:830362
        seconds:microseconds: 1240231193:939029
        (approx 59s)
4096-sized chunk run time:
        seconds:microseconds: 1240231199:800554
        seconds:microseconds: 1240231254:600778
        (approx 55s)
8192-sized chunk run time:
        seconds:microseconds: 1240231260:386834
        seconds:microseconds: 1240231315:121745
        (approx 55s)



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