On Mon, Mar 26, 2012 at 2:10 AM, zfs user <zf...@itsbeen.sent.com> wrote: > On 3/25/12 10:25 AM, Aubrey Li wrote: >> >> 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 > > > Is noatime turned on for all your zfs filesystems? > Have you tried the latest version of httpd? >
yeah, atime is turned off. It's not helpful to reduce the zfs vnode access. I didn't try the latest version of httpd. I want to get the same performance by the same user land software stack as it on Linux. Thanks, -Aubrey _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
