linux-kernel - Re: [PATCH 00/37] Permit filesystem local caching

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Date:	Fri, 22 Feb 2008 16:47:27 +0000
From:	David Howells <dhowells@...hat.com>
To:	Chris Mason <chris.mason@...cle.com>
Cc:	dhowells@...hat.com, Daniel Phillips <phillips@...nq.net>,
	Trond.Myklebust@...app.com, chuck.lever@...cle.com,
	casey@...aufler-ca.com, nfsv4@...ux-nfs.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	selinux@...ho.nsa.gov, linux-security-module@...r.kernel.org
Subject: Re: [PATCH 00/37] Permit filesystem local caching

Chris Mason <chris.mason@...cle.com> wrote:

> Thanks for trying this, of course I'll ask you to try again with the latest 
> v0.13 code, it has a number of optimizations especially for CPU usage.

Here you go.  The numbers are very similar.

David

=================================
FEW BIG FILES TEST ON BTRFS v0.13
=================================

Completely cold caches:

	[root@...romeda ~]# time cat /warthog/bigfile >/dev/null
	real    0m2.202s
	user    0m0.000s
	sys     0m1.716s
	[root@...romeda ~]# time cat /warthog/biggerfile >/dev/null
	real    0m4.212s
	user    0m0.000s
	sys     0m0.896s

Warm BTRFS pagecache, cold NFS pagecache:

	[root@...romeda ~]# time cat /warthog/bigfile >/dev/null
	real    0m0.197s
	user    0m0.000s
	sys     0m0.192s
	[root@...romeda ~]# time cat /warthog/biggerfile >/dev/null
	real    0m0.376s
	user    0m0.000s
	sys     0m0.372s

Warm on-disk cache, cold pagecaches:

	[root@...romeda ~]# time cat /warthog/bigfile >/dev/null
	real    0m1.543s
	user    0m0.004s
	sys     0m1.448s
	[root@...romeda ~]# time cat /warthog/biggerfile >/dev/null
	real    0m3.111s
	user    0m0.000s
	sys     0m2.856s


==================================================
MANY SMALL/MEDIUM FILE READING TEST ON BTRFS v0.13
==================================================

Completely cold caches:

	[root@...romeda ~]# time tar cf - /warthog/aaa >/dev/zero
	real    0m31.575s
	user    0m0.176s
	sys     0m6.316s

Warm BTRFS pagecache, cold NFS pagecache:

	[root@...romeda ~]# time tar cf - /warthog/aaa >/dev/zero
	real    0m16.081s
	user    0m0.164s
	sys     0m5.528s

Warm on-disk cache, cold pagecaches:

	[root@...romeda ~]# time tar cf - /warthog/aaa >/dev/zero
	real    2m15.245s
	user    0m0.064s
	sys     0m2.808s

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