Bob Friesenhahn <[email protected]> wrote: > On Mon, 13 Jul 2009, Mike Gerdts wrote: > > > > FWIW, I hit another bug if I turn off primarycache. > > > > http://defect.opensolaris.org/bz/show_bug.cgi?id=10004 > > > > This causes really abysmal performance - but equally so for repeat runs! > > It is quite facinating seeing the huge difference in I/O performance > from these various reports. The bug you reported seems likely to be > that without at least a little bit of caching, it is necessary to > re-request the underlying 128K ZFS block several times as the program > does numerous smaller I/Os (cpio uses 10240 bytes?) across it.
cpio reads/writes in 8192 byte chunks from the filesystem. BTW: star by default creates a shared memory based FIFO of 8 MB size and reads in the biggest possible size that would currently fit into the FIFO. Jörg -- EMail:[email protected] (home) Jörg Schilling D-13353 Berlin [email protected] (uni) [email protected] (work) Blog: http://schily.blogspot.com/ URL: http://cdrecord.berlios.de/private/ ftp://ftp.berlios.de/pub/schily _______________________________________________ zfs-discuss mailing list [email protected] http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
