Date: Fri, 30 Mar 2001 08:35:18 -0800 (PST) From: Matthew Jacob <mjacob@feral.com> To: Doug Rabson <dfr@nlsystems.com> Cc: Andrew Gallatin <gallatin@cs.duke.edu>, freebsd-alpha@FreeBSD.ORG Subject: Re: do we care about performance yet? Message-ID: <Pine.LNX.4.21.0103300834540.26846-100000@zeppo.feral.com> In-Reply-To: <Pine.BSF.4.33.0103301132230.56601-100000@herring.nlsystems.com>
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On Fri, 30 Mar 2001, Doug Rabson wrote: > On Thu, 29 Mar 2001, Andrew Gallatin wrote: > > > > > FWIW, I ran a make buildworld this evening on my UP1000 under iprobe, > > as well as with the receive side of a netperf tcp stream. > > > > (for anybody who doesn't know what iprobe is, check out > > http://www.cs.duke.edu/ari/iprobe) > > > > For the buildworld, the system spent about 40% of its time in kernel. > > Roughly 50% of that was in various states of idleness. I've left full > > reports at: > > > > http://www.cs.duke.edu/~gallatin/iprobe_current/ > > > > The "???NOT_FOUND" is userland code I didn't tell iprobe about. > > I think this is just showing a lot of contention for the Giant mutex (and > probably some i/o waiting). Since we don't halt on idle, the cpu will > spend a lot of time buzzlooping on runq_check. That's what I mean about I/O bound- I looked at runq_check and yes, that's really 'idle'. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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