From: "Chen, Kenneth W" <kenneth.w.chen@intel.com>
To: linux-ia64@vger.kernel.org
Subject: Volanomark regress on ia64
Date: Fri, 16 Sep 2005 00:40:15 +0000 [thread overview]
Message-ID: <200509160040.j8G0eFg06734@unix-os.sc.intel.com> (raw)
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Take a look at http://kernel-perf.sourceforge.net/results.machine_id=26.html
First chart with volanomark benchmark. It took ~ 11% performance regression
on 2.6.13-git9 and 2.6.14-rc1.
It is not those two particular kernel version have the problem per se. It
would've shown on 2.6.13-rc1 when default hz rate was switched to 250. Last
week, I happened to audit the system and made the hz switch and the problem
showed up.
Hz=1000 cpu idle is about 54%, the raw throughput is 74935 msgs/sec
Hz=250 cpu idle is about 58%, the raw throughput is 67246 msgs/sec
I think it has something to do with the scheduler load balance. While I'm
looking into schedstat and etc. Posting here for everyone to pour over the
issue.
vmstat/readprofle/schedstat result with 1K hz and 250 hz attached.
- Ken
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next reply other threads:[~2005-09-16 0:40 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-16 0:40 Chen, Kenneth W [this message]
2005-09-18 10:56 ` Volanomark regress on ia64 Nick Piggin
2005-09-18 21:43 ` John Hawkes
2005-09-19 6:44 ` Chen, Kenneth W
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