Date: Fri, 5 Feb 2010 11:57:19 -0500 From: Linda Messerschmidt <linda.messerschmidt@gmail.com> To: freebsd-hackers@freebsd.org Subject: ps "time" field jumps backward Message-ID: <237c27101002050857r78003779mb41eae44f850829b@mail.gmail.com>
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Hi all, For most of 7.2, on up to a 7.3-PRERELEASE built yesterday, I've noticed that the "time" field reported by ps and top jumps around for some processes. I've particularly noticed it with MySQL. Here are some repeated ps results (ps axo pid,time,wchan,comm) for the same process over a few minutes: 1647 0:08.06 ucond mysqld 1647 0:08.06 ucond mysqld 1647 0:08.06 ucond mysqld 1647 0:08.06 ucond mysqld 1647 0:08.07 ucond mysqld 1647 0:10.24 wdrain mysqld 1647 0:08.08 ucond mysqld 1647 0:09.25 - mysqld 1647 0:08.08 ucond mysqld 1647 0:08.91 - mysqld 1647 0:09.13 wdrain mysqld 1647 0:09.76 wdrain mysqld 1647 0:08.10 ucond mysqld 1647 0:08.11 ucond mysqld 1647 0:08.12 ucond mysqld 1647 0:08.12 ucond mysqld 1647 0:08.12 ucond mysqld 1647 0:08.12 ucond mysqld 1647 0:08.38 wdrain mysqld 1647 0:08.13 ucond mysqld 1647 0:09.47 - mysqld 1647 0:08.13 ucond mysqld 1647 0:08.13 ucond mysqld It's like when it starts working it builds up time, but as soon as it goes back to ucond, it resets back to the earlier value. This particular machine is an 8-core amd64, but I've seen it on quad-core i386 as well. Does anybody have an idea what's going on here? Thanks for any suggestions!
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