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Re: Some baseline tests on new hardware (was Re: [PATCH] xfs: optimise C

To: Dave Chinner <david@xxxxxxxxxxxxx>, <xfs@xxxxxxxxxxx>
Subject: Re: Some baseline tests on new hardware (was Re: [PATCH] xfs: optimise CIL insertion during transaction commit [RFC])
From: Chris Mason <chris.mason@xxxxxxxxxxxx>
Date: Mon, 8 Jul 2013 21:15:33 -0400
Cc: <linux-fsdevel@xxxxxxxxxxxxxxx>
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Quoting Dave Chinner (2013-07-08 08:44:53)
> [cc fsdevel because after all the XFS stuff I did a some testing on
> mmotm w.r.t per-node LRU lock contention avoidance, and also some
> scalability tests against ext4 and btrfs for comparison on some new
> hardware. That bit ain't pretty. ]
> And, well, the less said about btrfs unlinks the better:
> +  37.14%  [kernel]  [k] _raw_spin_unlock_irqrestore
> +  33.18%  [kernel]  [k] __write_lock_failed
> +  17.96%  [kernel]  [k] __read_lock_failed
> +   1.35%  [kernel]  [k] _raw_spin_unlock_irq
> +   0.82%  [kernel]  [k] __do_softirq
> +   0.53%  [kernel]  [k] btrfs_tree_lock
> +   0.41%  [kernel]  [k] btrfs_tree_read_lock
> +   0.41%  [kernel]  [k] do_raw_read_lock
> +   0.39%  [kernel]  [k] do_raw_write_lock
> +   0.38%  [kernel]  [k] btrfs_clear_lock_blocking_rw
> +   0.37%  [kernel]  [k] free_extent_buffer
> +   0.36%  [kernel]  [k] btrfs_tree_read_unlock
> +   0.32%  [kernel]  [k] do_raw_write_unlock

Hi Dave,

Thanks for doing these runs.  At least on Btrfs the best way to resolve
the tree locking today is to break things up into more subvolumes.  I've
got another run at the root lock contention in the queue after I get
the skiplists in place in a few other parts of the Btrfs code.


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