On Thu, May 03, 2007 at 11:43:49AM -0500, [EMAIL PROTECTED] wrote: > I think this may be a premature leap -- It is still undetermined if we are > running up against a yet unknown bug in the kernel implementation of gzip > used for this compression type. From my understanding the gzip code has > been reused from an older kernel implementation, it may be possible that > this code has some issues with kernel stuttering when used for zfs > compression that may have not been exposed with its original usage. If it > turns out that it is just a case of high cpu trade-off for buying faster > compression times, then the talk of a tunable may make sense (if it is even > possible given the constraints of the gzip code in kernelspace).
The in-kernel version is zlib is the latest version (1.2.3). It's not surprising that we're spending all of our time in zlib if the machine is being driving by I/O. There are outstanding problems with compression in the ZIO pipeline that may contribute to the bursty behavior. Adam -- Adam Leventhal, Solaris Kernel Development http://blogs.sun.com/ahl _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
