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Message-ID: <k2se6bf505b1004191232l345ee0e6y260de901e0bfc4c9@mail.gmail.com> Date: Mon, 19 Apr 2010 14:32:22 -0500 From: Xianghua Xiao <xiaoxianghua@...il.com> To: linux-kernel@...r.kernel.org Subject: Newer kernel with newer NPTL? I upgraded a 2.6.18-rt kernel to 2.6.33-rt and the my main multi-thread application now consumes 12% cpu at idle, all threads are a little bit busy while on 2.6.18-rt they are all quiet. I'm still using glibc2.5/nptl. After spending a few days on debugging/performance tuning the problem stays. Do I need upgrade glibc/nptl to work with a newer kernel as far as performance is concerned? This is a shipping product and we do not want to change everything unless it's mandatory. the WCHAN on 2.6.18 all showed "select" or "futex", on 2.6.33 it shows "poll_schedule_timeout" or "futex_wait_queue_me" at idle, I wonder if I need change 'select' in my application. a bit off-topic here, thanks for any help. xianghua -- 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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