On Mon, Mar 26, 2012 at 12:48 AM, Richard Elling <richard.ell...@richardelling.com> wrote: > This is the wrong forum for general purpose performance tuning. So I won't > continue this much farther. Notice the huge number of icsw, that is a > bigger > symptom than locks. > -- richard
thanks anyway, lock must be a problem. the scenario here is, apache causes a bunch of stat() syscall, which leads to a bunch of zfs vnode access, byond the normal read/write operation. The problem is, every zfs vnode access need the **same zfs root** lock. When the number of httpd processes and the corresponding kernel threads becomes large, this root lock contention becomes horrible. This situation does not occurs on linux. Let me see if any others have a clue for me. Any suggestions will be highly appreciated! Regards, -Aubrey > > On Mar 25, 2012, at 6:24 AM, Aubrey Li wrote: > > SET minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt idl > sze > 0 35140 0 2380 59742 19476 93056 30906 32919 256336 1104 967806 > 65 35 0 0 32 > SET minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt idl > sze > 0 36044 0 3268 61910 19482 96287 32121 32844 245293 1122 954150 > 64 36 0 0 32 > SET minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt idl > sze > 0 36516 0 3900 61459 19478 95502 31256 35345 221473 1106 932210 > 66 34 0 0 32 > SET minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt idl > sze > 0 35791 0 3544 60751 19371 97982 31158 33920 209179 3115 859644 > 64 36 0 0 32 > SET minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt idl > sze > 0 38317 0 4892 63046 19566 97316 31688 38100 220262 2058 915555 > 65 35 0 0 32 > SET minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt idl > sze > 0 36408 0 3154 60766 19393 94343 31244 35582 248314 811 980967 > 65 35 0 0 32 > > > -- > DTrace Conference, April 3, > 2012, http://wiki.smartos.org/display/DOC/dtrace.conf > ZFS Performance and Training > richard.ell...@richardelling.com > +1-760-896-4422 > > > _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
