xfs
[Top] [All Lists]

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>
Delivered-to: xfs@xxxxxxxxxxx
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/simple; d=fusionio.com; s=default; t=1373332535; bh=gYqEMjCxkegcDfYCamTyU+50rVjGgv2RvMMxcuJvKwo=; h=To:From:In-Reply-To:CC:References:Subject:Date; b=gOv+4tWO8K0v/rmqjW6PzF5D77eEciJRaDabxBpk2ZYm2akGPdVSeD36+H9Hwvav2 IwDuRH9wVJg9CjFWnCOY71BTYWRgxlSKDVBOZ1wBaWAX7KXDX6ks1+yOY8AVU8KFFF oXsa43tMYN71O7Eb5/wOKMwG6zgasvadFPguzKPc=
In-reply-to: <20130708124453.GC3438@dastard>
References: <1372657476-9241-1-git-send-email-david@xxxxxxxxxxxxx> <20130708124453.GC3438@dastard>
User-agent: alot/0.3.4
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.

-chris

<Prev in Thread] Current Thread [Next in Thread>