Some baseline tests on new hardware (was Re: [PATCH] xfs: optimise CIL insertion during transaction commit [RFC])

[Marco Stornelli]

Il 08/07/2013 15:59, Jan Kara ha scritto:
> On Mon 08-07-13 22:44:53, Dave Chinner wrote:
> <snipped some nice XFS results ;)>
>> So, lets look at ext4 vs btrfs vs XFS at 16-way (this is on the
>> 3.10-cil kernel I've been testing XFS on):
>>
>> 	    create		 walk		unlink
>> 	 time(s)   rate		time(s)		time(s)
>> xfs	  222	266k+-32k	  170		  295
>> ext4	  978	 54k+- 2k	  325		 2053
>> btrfs	 1223	 47k+- 8k	  366		12000(*)
>>
>> (*) Estimate based on a removal rate of 18.5 minutes for the first
>> 4.8 million inodes.
>>
>> Basically, neither btrfs or ext4 have any concurrency scaling to
>> demonstrate, and unlinks on btrfs a just plain woeful.
>    Thanks for posting the numbers. There isn't anyone seriously testing ext4
> SMP scalability AFAIK so it's not surprising it sucks.

Funny, if I well remember Google guys switched android from yaffs2 to 
ext4 due to its superiority on SMP :)

Marco