Re: Performance of ext3 on large systems

From: Dave Hansen (haveblue@us.ibm.com)
Date: Sun Feb 16 2003 - 20:18:41 EST

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Martin J. Bligh wrote:
> OK, so I guess we all know that ext3 doesn't scale well. But by
> accident, I have some numbers on exactly how bad it really is:
>
> Kernbench-2: (make -j N vmlinux, where N = 2 x num_cpus)
> Elapsed User System CPU
> 2.5.61-mjb0.1-ext3 48.47 564.13 143.16 1458.67
> 2.5.61-mjb0.1-ext2 46.06 563.04 115.36 1472.33
>
> (look at system time ... eeek!)
>
> diffprofile (+ is worse with ext3, - better)
>
> 12702 .text.lock.inode

# grep -c lock_kernel fs/ext3/inode.c
35

-- Dave Hansen haveblue@us.ibm.com

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