Messages in this thread | | | From | David Howells <> | Subject | Re: [PATCH 00/37] Permit filesystem local caching | Date | Fri, 22 Feb 2008 16:14:35 +0000 |
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David Howells <dhowells@redhat.com> wrote:
> > > Have you got before/after benchmark results? > > > > See attached. > > Attached here are results using BTRFS (patched so that it'll work at all) > rather than Ext3 on the client on the partition backing the cache.
And here are XFS results.
Tuning XFS makes a *really* big difference for the lots of small/medium files being tarred case. However, in general BTRFS is much better.
David ---
========================= FEW BIG FILES TEST ON XFS =========================
Completely cold caches:
[root@andromeda ~]# time cat /warthog/bigfile >/dev/null real 0m2.286s user 0m0.000s sys 0m1.828s [root@andromeda ~]# time cat /warthog/biggerfile >/dev/null real 0m4.228s user 0m0.000s sys 0m1.360s
Warm NFS pagecache:
[root@andromeda ~]# time cat /warthog/bigfile >/dev/null real 0m0.058s user 0m0.000s sys 0m0.060s [root@andromeda ~]# time cat /warthog/biggerfile >/dev/null real 0m0.122s user 0m0.000s sys 0m0.120s
Warm XFS pagecache, cold NFS pagecache:
[root@andromeda ~]# time cat /warthog/bigfile >/dev/null real 0m0.181s user 0m0.000s sys 0m0.180s [root@andromeda ~]# time cat /warthog/biggerfile >/dev/null real 0m1.034s user 0m0.000s sys 0m0.404s
Warm on-disk cache, cold pagecaches:
[root@andromeda ~]# time cat /warthog/bigfile >/dev/null real 0m1.540s user 0m0.000s sys 0m0.256s [root@andromeda ~]# time cat /warthog/biggerfile >/dev/null real 0m3.003s user 0m0.000s sys 0m0.532s
========================================== MANY SMALL/MEDIUM FILE READING TEST ON XFS ==========================================
Completely cold caches:
[root@andromeda ~]# time tar cf - /warthog/aaa >/dev/zero real 4m56.827s user 0m0.180s sys 0m6.668s
Warm NFS pagecache:
[root@andromeda ~]# time tar cf - /warthog/aaa >/dev/zero real 0m15.084s user 0m0.212s sys 0m5.008s
Warm XFS pagecache, cold NFS pagecache:
[root@andromeda ~]# time tar cf - /warthog/aaa >/dev/zero real 0m13.547s user 0m0.220s sys 0m5.652s
Warm on-disk cache, cold pagecaches:
[root@andromeda ~]# time tar cf - /warthog/aaa >/dev/zero real 4m36.316s user 0m0.148s sys 0m4.440s
======================================================= MANY SMALL/MEDIUM FILE READING TEST ON AN OPTIMISED XFS =======================================================
mkfs.xfs -d agcount=4 -l size=128m,version=2 /dev/sda6
Completely cold caches:
[root@andromeda ~]# time tar cf - /warthog/aaa >/dev/zero real 3m44.033s user 0m0.248s sys 0m6.632s
Warm on-disk cache, cold pagecaches:
[root@andromeda ~]# time tar cf - /warthog/aaa >/dev/zero real 3m8.582s user 0m0.108s sys 0m3.420s
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