On 05/31/2010 01:13 PM, Bob Friesenhahn wrote: > On Sun, 30 May 2010, Sandon Van Ness wrote: >> >> The problem is that when it does the write burst its taking away CPU >> usage from rsync which is actually what might be causing the dip during >> writes (not the I/O activity itself) but the CPU generated from the >> writes. > > You didn't say which Solaris you are using, but I think that there are > recent updates to Solaris 10 and OpenSolaris which are supposed to > solve this problem (zfs blocking access to CPU by applications). > > From Solaris 10 x86 (kernel 142901-09): > > 6586537 async zio taskqs can block out userland commands > > Bob
Btw I tried the work around in that bug: http://bugs.opensolaris.org/view_bug.do?bug_id=6586537 However I get: zio_taskq_threads is not defined in 'zfs' module when I make the change to /etc/system also I get: r...@opensolaris: 03:20 PM :/etc# echo zio_taskq_threads/D | mdb mdb: failed to dereference symbol: unknown symbol name also i can see its running a ton of threads from prstat from earlier. Anyone know a way I can reduce it to one thread as I think that work around will work for me. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
