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Message-ID: <9871ee5f0807181512u231e1aaraee5622d0a814f97@mail.gmail.com> Date: Fri, 18 Jul 2008 18:12:44 -0400 From: "Timothy Normand Miller" <theosib@...il.com> To: "Peter Zijlstra" <peterz@...radead.org> Cc: linux-kernel@...r.kernel.org Subject: Re: Problem: Load average of 6, no I/O, 25% idle time. Why? On Fri, Jul 18, 2008 at 9:28 AM, Peter Zijlstra <peterz@...radead.org> wrote: > On Fri, 2008-07-18 at 08:49 -0400, Timothy Normand Miller wrote: >> I have a four processor box, running three compute loads. The kernel >> I'm running is 2.6.25-gentoo-r5. >> >> One process has four threads, and it's niced to 19. >> Another process has one thread and is niced to -10 >> The last process has one thread and is niced to 0 >> >> One processor is always idle. >> >> If I change either the 0 to a -10 or the -10 to a zero, then all four >> cores are properly utilized. Interesting corollary: If the only thing running is the one nice=19, four-thread process, then there's about 4% idle time. I have to raise the priority to get the idle time to go away. Since when do active processes yield to idle time? Two of my three loads are finished, so when this last one is done, I'll try 2.6.26. Was something like this actively discussed and fixed between 2.6.25 and 2.6.26? Thanks. -- Timothy Normand Miller http://www.cse.ohio-state.edu/~millerti Open Graphics Project -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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