Messages in this thread | | | From | "Rob Mueller" <> | Subject | Re: Strange load spikes on 2.4.19 kernel | Date | Sat, 12 Oct 2002 12:25:47 +1000 |
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> > Filesystem is ext3 with one big / partition (that's a mistake > > we won't repeat, but too late now). This should be mounted > > with data=journal given the kernel command line above, though > > it's a bit hard to tell from the dmesg log: > > > > It's possible tht the journal keeps on filling. When that happens, > everything has to wait for writeback into the main filesystem. > Completion of that writeback frees up journal space and then everything > can unblock. > > Suggest you try data=ordered.
We have a 192M journal, and from the dmesg log it's saying that it's got a 5 second flush interval, so I can't imagine that the journal is filling, but we'll try it and see I guess.
What I don't understand is why the spike is so sudden, and decays so slowly. It's Friday night now, so the load is fairly low. I setup a loop to dump uptime information every 10 seconds and attached the result below. It's running smoothly, then 'bam', it's hit with something big, which then slowly decays off.
A few extra things: 1. It happens every couple of minutes or so, but not exactly on any time, so it's not a cron job or anything 2. Viewing 'top', there are no extra processes obviously running when it happens
Rob
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