On Tue, Sep 30, 2008 at 09:44:21PM -0500, Al Hopper wrote: > > This behavior is common to tmpfs, UFS and I tested it on early ZFS > releases. I have no idea why - I have not made the time to figure it > out. What I have observed is that all operations on your (victim) > test directory will max out (100% utilization) one CPU or one CPU core > - and all directory operations become single-threaded and limited by > the performance of one CPU (or core).
And sometimes its just a little bug: E.g. with a recent version of Solaris (i.e. >= snv_95 || >= S10U5) on UFS: SunOS graf 5.10 Generic_137112-07 i86pc i386 i86pc (X4600, S10U5) ============================================================================= admin.graf /var/tmp > time sh -c 'mkfile 2g xx ; sync' 0.05u 9.78s 0:29.42 33.4% admin.graf /var/tmp > time sh -c 'mkfile 2g xx ; sync' 0.05u 293.37s 5:13.67 93.5% admin.graf /var/tmp > rm xx admin.graf /var/tmp > time sh -c 'mkfile 2g xx ; sync' 0.05u 9.92s 0:31.75 31.4% admin.graf /var/tmp > time sh -c 'mkfile 2g xx ; sync' 0.05u 305.15s 5:28.67 92.8% admin.graf /var/tmp > time dd if=/dev/zero of=xx bs=1k count=2048 2048+0 records in 2048+0 records out 0.00u 298.40s 4:58.46 99.9% admin.graf /var/tmp > time sh -c 'mkfile 2g xx ; sync' 0.05u 394.06s 6:52.79 95.4% SunOS kaiser 5.10 Generic_137111-07 sun4u sparc SUNW,Sun-Fire-V440 (S10, U5) ============================================================================= admin.kaiser /var/tmp > time mkfile 1g xx 0.14u 5.24s 0:26.72 20.1% admin.kaiser /var/tmp > time mkfile 1g xx 0.13u 64.23s 1:25.67 75.1% admin.kaiser /var/tmp > time mkfile 1g xx 0.13u 68.36s 1:30.12 75.9% admin.kaiser /var/tmp > rm xx admin.kaiser /var/tmp > time mkfile 1g xx 0.14u 5.79s 0:29.93 19.8% admin.kaiser /var/tmp > time mkfile 1g xx 0.13u 66.37s 1:28.06 75.5% SunOS q 5.11 snv_98 i86pc i386 i86pc (U40, S11b98) ============================================================================= elkner.q /var/tmp > time mkfile 2g xx 0.05u 3.63s 0:42.91 8.5% elkner.q /var/tmp > time mkfile 2g xx 0.04u 315.15s 5:54.12 89.0% SunOS dax 5.11 snv_79a i86pc i386 i86pc (U40, S11b79) ============================================================================= elkner.dax /var/tmp > time mkfile 2g xx 0.05u 3.09s 0:43.09 7.2% elkner.dax /var/tmp > time mkfile 2g xx 0.05u 4.95s 0:43.62 11.4% Regards, jel. -- Otto-von-Guericke University http://www.cs.uni-magdeburg.de/ Department of Computer Science Geb. 29 R 027, Universitaetsplatz 2 39106 Magdeburg, Germany Tel: +49 391 67 12768 _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
