David Howells <dhowells@xxxxxxxxxx> 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 - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
