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Date: Fri, 09 Jul 2010 07:55:09 +0200 From: Mike Galbraith <efault@....de> To: Peter Zijlstra <peterz@...radead.org> Cc: Norbert Preining <preining@...ic.at>, Arjan van de Ven <arjan@...radead.org>, linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>, akpm <akpm@...ux-foundation.org>, tglx <tglx@...utronix.de> Subject: Re: high power consumption in recent kernels On Thu, 2010-07-08 at 22:44 +0200, Peter Zijlstra wrote: > On Thu, 2010-07-08 at 21:40 +0200, Mike Galbraith wrote: > > > Mike could you re-run your netperf tests that showed the 10% throughput > > > gain? Hopefully the fixed governor will yield the same result and we can > > > kill off this ratelimit thing. > > > > The gain is (well was last time I checked), but as noted, I'd just call > > it a misguided optimization and be done with it. > > It would still be good to know what your machine does, if you can still > see a difference there might still be something to look at. git .today. marge:..git/linux-2.6 # netperf.sh 30 Starting netserver at port 12865 Starting netserver at hostname 0.0.0.0 port 12865 and family AF_UNSPEC TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 127.0.0.1 (127.0.0.1) port 0 AF_INET Local /Remote Socket Size Request Resp. Elapsed Trans. Send Recv Size Size Time Rate bytes Bytes bytes bytes secs. per sec 16384 87380 1 1 30.00 102272.73 16384 87380 TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 127.0.0.1 (127.0.0.1) port 0 AF_INET : cpu bind Local /Remote Socket Size Request Resp. Elapsed Trans. Send Recv Size Size Time Rate bytes Bytes bytes bytes secs. per sec 16384 87380 1 1 30.00 97638.99 16384 87380 turns ratelimiting off marge:..git/linux-2.6 # netperf.sh 30 Starting netserver at port 12865 Starting netserver at hostname 0.0.0.0 port 12865 and family AF_UNSPEC TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 127.0.0.1 (127.0.0.1) port 0 AF_INET Local /Remote Socket Size Request Resp. Elapsed Trans. Send Recv Size Size Time Rate bytes Bytes bytes bytes secs. per sec 16384 87380 1 1 30.00 92991.02 16384 87380 TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 127.0.0.1 (127.0.0.1) port 0 AF_INET : cpu bind Local /Remote Socket Size Request Resp. Elapsed Trans. Send Recv Size Size Time Rate bytes Bytes bytes bytes secs. per sec 16384 87380 1 1 30.00 97665.27 16384 87380 btw, if you don't set governor to performance, you can get crud throughput like below, because the ondemand governor doesn't necessarily notice that the CPUs really are busy when waking cross-cpu. marge:..git/linux-2.6 # netperf.sh 10 Starting netserver at port 12865 Starting netserver at hostname 0.0.0.0 port 12865 and family AF_UNSPEC TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 127.0.0.1 (127.0.0.1) port 0 AF_INET Local /Remote Socket Size Request Resp. Elapsed Trans. Send Recv Size Size Time Rate bytes Bytes bytes bytes secs. per sec 16384 87380 1 1 10.00 73341.95 <== blech 16384 87380 TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 127.0.0.1 (127.0.0.1) port 0 AF_INET : cpu bind Local /Remote Socket Size Request Resp. Elapsed Trans. Send Recv Size Size Time Rate bytes Bytes bytes bytes secs. per sec 16384 87380 1 1 10.00 97695.45 16384 87380 -- 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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