Bart wrote: > Adam Leventhal wrote: > > On Wed, May 09, 2007 at 11:52:06AM +0100, Darren J Moffat wrote: > >> Can you give some more info on what these problems are. > > > > I was thinking of this bug: > > > > 6460622 zio_nowait() doesn't live up to its name > > > > Which was surprised to find was fixed by Eric in build 59. > > > > It was pointed out by Jürgen Keil that using ZFS compression > submits a lot of prio 60 tasks to the system task queues; > this would clobber interactive performance.
Actually the taskq "spa_zio_issue" / "spa_zio_intr" run at prio 99 (== maxclsyspri or MAXCLSYSPRI): http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/fs/zfs/spa.c#109 Btw: In one experiment I tried to boot the kernel under kmdb control (-kd), patched "minclsyspri := 61" and used a breakpoint inside spa_active() to patch the spa_zio_* taskq to use prio 60 when importing the gzip compressed pool (so that the gzip compressed pool was using prio 60 threads and usb and other stuff was using prio >= 61 threads). That didn't help interactive performance... This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
